Guide To P2677 OBD Error Code Solutions

<<See All OBD Codes    

This code specifies that the PCM, or any of the other supporting control modules, has found a problem inside the air cleaner inlet control circuit. These control modules might come with, though not restricted to, the transmission control module, the body control module, the anti-lock brake control module, the instrument panel control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, as well as the climate control module.

At the incident of an air cleaner inlet control circuit problem, an error code is being stored and a service engine soon lamp illuminates. Few models need many drive cycles, as much as eight, with a failed attempt to illuminate the service engine soon lamp. Any others models are to illuminate the service engine soon lamp on the prime failure.

What causes this problem with the Air Cleaner Inlet Control Circuit High?

• Defective Air Cleaner Inlet Control
• Open or shorted Air Cleaner Inlet Control harness
• Bad electrical connection to Air Cleaner Inlet Control circuit

1. Engine Control Module - An illuminated Check Engine Light is a major sign of an issue related to the Engine Control Module. The Check Engine Light normally starts to illuminate when the computer specifies an issue that is related to all of its sensors or circuits. In a few situations, the ECM triggers a Check Engine Light by mistake, or when no problem is current. Scanning the computer for error codes can assist in detecting whether or not there is a problem with the ECM, or wherever the problem is spotted within the vehicle. Irregular engine behavior is another primary symptom of a faulty or failing ECM. A computer that fails could be faced with a vehicle that experiences abnormal errors such as stalling or misfiring. The symptoms might come and go, and might not show any kind of pattern to their continuity or extremity. Engine performance errors are another symptom of a viable problem related the ECM. If the ECM has any problems, it might conclude that timing and fuel conditions of the vehicle can put a bad affect the performance. A defective ECM could result in the vehicle to deal with a decrease in fuel efficiency, power, and acceleration. A vehicle that is failing to start or challenged to restart is another major symptom of a faulty or failed ECM. If the ECM fails entirely, the vehicle will stay deprived of engine power control, and will fail to start or run as an outcome. The engine might still be cranking, but will fail at starting if deprived of all the essential inputs coming from the computer. A vast range of other problems can also result in this symptom, so it is a better idea to do an overall diagnosis that is operated by an experienced mechanic to continue specifying the result.
2. Powertrain Control Module - Abnormal engine behavior might specify a faulty or
   failed PCM. A failed computer might result in a vehicle that stalls unpredictably or fails to start at all. If the PCM is dealing with any error, it could withstand the timing and fuel settings of the engine that could badly affect the vehicle as it is processing. A faulty PCM could lead to a vehicle that is faced with a reduction in fuel efficiency, power, and acceleration. A faulty PCM could deal with a vehicle that fails to start or struggles to restart. If the PCM fails entirely, the vehicle remains dealing with a loss of engine power control, so it might fail to start or experience issues in performing as an outcome. The engine could still be cranking, but have no critical inputs coming from the computer, so it will withstand starting at all.
3. Shift Solenoid - A check engine light that comes on happens as the TCM persists in testing the shift solenoid performance system. If it finds an error in any of the solenoids or any associated circuits, it will transfer a command to the engine’s computer to switch on the check engine light. Irregular shifting or shift slipping is when the shift solenoids control the liquid flow of hydraulics while shifting. An error with any or more of the solenoids can result in a loss of pressure, which leads to hard, soft or hesitated shifts. A failed shift solenoid can also result in transmission slipping, where your engine rev is faster, but the vehicle remains at an accurate speed. While a transmission does not shift gears, this occurs when a defective shift solenoid prevents fluid stress from triggering the correct gear. As an outcome, the transmission might not shift gears or it might get stuck at Neutral position. A Vehicle that gets stuck in Limp-home Mode is when the TCM specifies an issue with a shift solenoid, as it could position the vehicle at Limp-home Mode. In this case, the transmission will be pushed into second or third gear to restrict your speed and one or more illuminated Warning Lights that will flash on the dashboard.
4. Electronic Pressure Regulator - On duration, the pressure switch wears out. If the pressure switch is not starting the pump when tank pressure plummets below the cut-in pressure or will not be able to avert the pump while the tank makes contact with the cutout pressure, and then replace the pressure switch with the necessary vehicle builder’s replacement component. Sensors typically activate a Warning Light on the dashboard if they, or else the system, are discovered to be wrong. Whether it’s ECU or PCM, they provide all the data by sensors; activate a Warning Light on your dashboard that displays when something is incorrect with the sensors. If an individual sensor, such as a tire pressure sensor is not performing to a degree of perfection, the ECU illuminates the Check Engine Light. The Check Engine Light is able to illuminate due to a variety of errors, so it’s best to be very familiar and aware of this problem. It is better to visit your local mechanic to diagnose the trouble shoot behind the Check Engine Light symbol. You can easily detect the reading “Tire pressure sensor defect” on your dashboard.
5. Throttle Body - Both dirt and grime can accumulate inside the housing, which causes disruption in the air/fuel flow. As an outcome, to not sustain a regularly smooth surface for the fuel and air to flow in past, this fragile compound is disrupted with a course surface, which causes a lack of ratio in the flow of air. Pertinent dirt and grime, even carbon deposits can provide an unbalanced surface inside the walls of the throttle body, which can interrupt the mixture of air/fuel being atomized. Electrical connection problems can result in inconsistent or irregular data being transferred to the vehicle’s computer. When it points out to any electrical connection, problems with connecting can result in a vast range of unexpected signals in being sent. In a situation when the throttle body and any related sensor do take place, this will cause an inconsistent or abnormal data being transferred to the vehicle’s computer, which results in defective adjustments being made to the mixture of air/fuel. Vacuum leaks can interrupt the air/fuel flow since there is an inconsistency of airflow that can lead to throttle body pressure errors. The problem might also be an improperly repaired throttle obstruction. This is a part that behaves as an entrance controller and activates a high or low positioning for a throttle body plate in opening or closing. As a throttle body is not working properly, some particular features could be faulty or an idle is running low. This can take to stalling when suddenly coming to a stop or an idle that is running low after starting, or even stalling as the throttle is pressed very fast, which results in the throttle body plate to open and close very fast. In any situation when a vacuum is leaking, you might experience a very high idle, which results in excessive air that is allowed to enter the intake system. This is usually the outcome of a huge vacuum leak. All of these symptoms will set forth a faulty engine performance and as an outcome will result in your Check Engine Light to illuminate.
6. Mass Air Flow Sensor - These symptoms inspect a MAF that has contaminated hot wire. The contamination can take structure of spider webs; protecting a mixture by the MAF sensor itself, dirt is attached to oil on the MAF by an aftermarket air filter that is boiled excessively. Any element on the hot wire that acts out like insulation will cause this type of error. The adjustment is as simple as cleaning the MAF sensor with an initially recognized cleaner, which the technicians can achieve for you if they specify this as the rooted problem. A MAF sensor that continues to produce an excessive amount of recording or even slighter reports on air flowing into the engine will cause an engine to run on rich or lean oil. If the engine control system runs properly, you will certainly not ever notice this apart from a fluctuation in the fuel economy. A certified mechanic will take a look at fuel trim status by utilizing a scan tool to identify this. A MAF sensor that behaves in this manner has to be replaced. In the process of having the sensor replaced, all faces of the circuit that linger have to be checked for appropriate performance. If the circuit has any error, having the sensor replaced will not solve your issue. An MAF sensor that failed completely will not send any airflow information to the PCM. This prevents the PCM from persisting to manage the fuel, which will cause an engine to idle coarsely or not run at all. Apparently, having the MAF sensor replaced is mandatory in this case.
7. Fuel Pump Control Module - Symptoms of a faltering fuel-pump driver module is all evident in the performing engine. Difficulties at starting or facing a hazy start-up, stalling or uneven running while idling, slowing and failing as you drive, including power surges as you shift into reverse will all, separately or simultaneously, be inspected as a failed module. A failure can normally be diagnosed electronically by utilizing a manual scanner, with a particular model code displaying the readings on the fuel-pump driver module. Vehicles that are assisted by improved engines that need even more fuel than what is in demand, for instance sports cars and high-pitched street cars, require more improved FPDMs. Running an advanced module can ultimately result in overheating, while the upgraded fuel pump commands a certain amount of the module, and its electronics start overheating, so the inside limiter shuts off the control procedure. In spite the module needs to continue running as it cools to a temperature that is safe, the abrupt procedure of concluding the fuel flow to a complete engine can put on catastrophic effects.
8. Vehicle Speed Sensor - If lacking a valid speed signal from any of these sensors, the PCM will be unable of properly control the gear shifts in the transmission. This might result in the transmission shifting so coarsely or even fast than usual. It's even common that an error that deals with these sensors can affect the timing of shifts, stretching the interlude between transmission shifts. A vehicle transmission is controlled by hydraulics and developed to shift steadily. As the transmission is shifting roughly, it can damage inside parts that are facing valve bodies, hydraulic lines, and especially mechanical gears. If you notice that your transmission is shifting roughly, you have to reach a local technician immediately. While the transmission speed sensors test the input and output shaft speed, it also contributes in inspecting the cruise control. As the sensors fail to send consistent data to the onboard computer on your vehicle, truck, or SUV, the powertrain control module (PCM) will send a trouble code to the vehicle’s ECU. Regarding the safety hazards, the ECU will shut off the cruise control and be reading it as not active. If you see that your cruise control is not engaged as you push the button, contact a technician so they can monitor the vehicle and find out the cause of a cruise control that does not run properly. It might be due to a defective transmission speed sensor. If the transmission speed sensor has lost trace of the signals, the PCM will set a DTC and activate the Check Engine Light on the vehicle dashboard. It is capable to detect a raise in tailpipe fumes at an occurrence that reaches out to the consented limits for environmental pollutants by vehicles run by motors.
9. Wheel Speed Sensor - When the wheel speed sensor also monitors the anti-lock braking system on your vehicle, it is recurrently a cause for the ABS Light to turn on when the sensor wears away, disengages, or becomes struck by debris, which calls for replacing the wheel speed sensor. There are other problems that will cause this Warning Light to come on, even a faulty ABS pump, worn out brake pads, decreasing brake fluid levels, issues with brake pressure, or air being stuck in the brake lines. As this is a crucial situation of brake component failure or brake damage, it's very important to contact an experienced mechanic instantly, if you see the ABS Light on your dashboard flash when you’re driving. The anti-lock braking system is organized to employ a steady implementation of brake fluid to power the brake calipers and pads, in order to activate your vehicle at a slow without being faced with tires locking up. The wheel speed sensor is moderated as estimable to deliver the wheel speed to the ECU so it exchanges a message with the ABS system of the quantity in pressure as being cautiously applied. As the wheel speed sensor is breaking or will not perform, as it needs to, a major sign of a negative effect is the ABS system. If you press your brakes and you notice the front tires are locked up, you have to immediately contact a local technician to inspect this problem. This problem can be awareness to danger and should not be ignored. If needed, it is recommended to heed driving the vehicle until a technician does a diagnosis on the problem and adjusts the ABS system. To better demonstrate this framework, it will be a faulty wheel speed sensor that needs replacing. The Traction Control Light on modern cars is usually turned on as the driver of the vehicle switches off the system. If you aren’t capable of completing this step or if the traction control is triggered, the most generic reason of an illuminated light is due to a faulty wheel speed sensor.
   The wheel speed sensor also monitors wheel speed and sends the information to the traction control system. For this reason, Warning Light being signaled is generically due to a worn down or fragmented wheel speed sensor. To the likeness of the ABS system, traction control is a safety device for cars, trucks, and SUVs. It is particularly structured to ensure the tires do not break insecurely when the throttle is being installed. If you notice that the traction control light is illuminated, and it failed to turn off, contact your local mechanic immediately.
10. Fuel Injectors - A major symptom of a possible error that faces a fuel injector failure is an engine performance error. If any of the vehicle’s fuel injectors are dealing with a problem, the air fuel ratio of the engine will be pressured, which can result in performance errors. A defective fuel injector can lead the vehicle to be facing a misfire, a loss of power, acceleration, and a decrease in fuel efficiency, including a critical action that will result in a stall or keep the engine from working at all. Another generic symptom of a crucial problem associated to a fuel injector is a fuel odor. The injector’s houses high pressures, and over a period can lead to a leaking nozzle or seal that is positioned at the injector tip. An injector that leaks will send too much fuel to the combustion chamber of the engine, but fuel will be leaking from the seal positioned at the injector base. Acknowledging these symptoms, they will potentially put an effect on the engine performance, particularly fuel efficiency, and will typically create an identified fuel odor. Any kind of fuel odor has to be attended to instantly, so you can sustain them from running into a safety hazard. Another major symptom of a potential error is a bad fuel injector that activates the Check Engine Light. Any of these fuel injectors that get plugged cause a misfire or deals with an electrical problem, this will trigger the computer to trigger the Check Engine Light in making sure the driver alert of the problem. A vast range of other engine control problems can also trigger the Check Engine Light, so scanning the computer for error codes is highly considered.
11. Cruise Control Module - A major symptom most generically related to a troubled cruise control vacuum reservoir is speed surging while the cruise control is connected. If the cruise control vacuum reservoir has failed, the cruise control system will remain without the vacuum it needs to support the vehicle throughout a steady speed or differentiation of acceleration. The cruise control might still attempt to house the vehicle at a specific speed; whatsoever, it will ultimately be working low on vacuum, which will cause a slowing vehicle. The speed of the vehicle might persist in changing as the cruise control system consumes and then regains vacuum pressure. Another major symptom of an error with the cruise control reservoir is a cruise control system that is simply unable to sustain speed. If the cruise control vacuum reservoir has failed, the cruise control system will remain without needing its vacuum reserve, and as an outcome, will be unable to support the vehicle at the correct set of speed or range of acceleration. Another major symptom of a possible error with the cruise control vacuum reservoir is an engine performance glitch. If the vacuum reservoir is breaking or leaking, it could result in a vacuum leak that can impacts the vehicle performance. It depends on the intensity of the leak, in which the vehicle might endure a reduction in acceleration, power output, and fuel effectiveness.

Are you eager to learn few generic symptoms of OBD Code P2677? We are here to grant your wish. Take a glance at these points below:

Common Symptoms

• Decreased Fuel Efficiency
• Excessively High Fuel Pressure
• Illuminated Malfunction Indicator Lamp (MIL)
• The light might remain on or light abnormally as the DPF restores. The engine will be slow on gaining speed.

We have written down a few methods that can help you correct the incident of OBD Code P2677. These points are described below as the following:

• If either the sourced voltage or ground circuits have opened, utilize the digital volt/ohmmeter to detect for progression, disengage all associated control modules from the circuit before detecting circuit resistance or controller damage that might take place and resistance to all circuits.
• Apart from other diagnostic codes, this kind of code can occasionally be better given to an experienced mechanic as it basically involves the bulk of circuitry.
• Irregular settings can be proven to be very challenging to diagnose and in intense situations might have enabled getting even worse before attempting to correct a diagnosis.
• Usual results of low pump pressure come with plugged hydraulic passages, a faulty pump, defective shift solenoids, or a defective electronic pressure regulator.

Do not get stressed if your OBD Code is still bleeping on, as our team is available to serve you. Take a glance at our upscale range of ECM, PCM, Shift Solenoids, Electronic Pressure Regulator, Throttle Body, Mass Airflow Sensor, Fuel Control Module, Vehicle Speed Sensor, Wheel Speed Sensor, Cruise Control Module, Fuel Injector and even more. This way all your issues will disappear in a flash.

If you are eager to simply diagnose this error code, then you must read these following steps that are described as follows:

• Few vehicles are built with an air cleaner inlet that controls airflow going in past the intake air tube and straight to the throttle body/mass airflow sensor.
• The inlet door is normally closed when placing the key in the OFF setting and opened when placing the key in the ON setting.
• Few vehicles demand also use the inlet door to control airflow going in past the intake tube by repairing to an extent to which this door is opening in relation to throttle setting.
• If the code is being displayed, seek advice with a vehicle service manual to find out which kind of system is best to be equipped with your vehicle.
• This kind of code typically stands for a function crash in the controller area network (CAN).
• The CAN stands for a communication bus that enables many microcontrollers to share messages with each other without depending on a host computer
• The protocol is message-based that is initially designated for vehicle use.
• The CAN bus network is primarily a multiplex assortment of wiring harnesses and connectors utilized as a conduit of data that is distributed between two or more vehicle control modules.
• These controllers manage nearly every electrical performance of the vehicle, since the PCM is the main controller.
• Control modules are given input data by a variety of sensors and release output signals to system parts and all other control modules.
• For instance, the PCM is given an input signal by the vehicle speed sensor.
• This signal is methodically sent over to impacted control modules that use the data to achieve a variety other duty.
• The cruise control module utilizes the data for speed control motives, as the traction control system utilizes the data to manage vehicle traction control scheme, and the anti-lock brake controller is matched up with vehicle speed from the PCM with data inputs from separate wheel speed sensors to run the anti-lock braking system. Many tools will become useful in trying to achieve diagnose with this code.
• An acceptable OBD-II scanner, or code reader, and a digital volt/ohmmeter will very assertive in attempting to conduct a triumphant diagnosis.
• Start with a visible monitoring of all wiring and connectors.
• Replace or repair damaged, corroded, shorted or disconnected wiring, connectors, and parts as needed.
• Persist in retesting the system after finishing repairs to make sure it is successful. If all system wiring, connectors, and parts, that includes fuses, show up in regular working condition, engage the scanner or code reader to the diagnostic connector and document all supplied codes and freeze frame data.
• This data can be intensely assisting in diagnosing irregular settings that might have provided to this code that is stored.
• Persist at clearing the code and running the vehicle to affirm if it comes back.
• This will assist in finding out whether or not the function crash is abnormal.
• After having cleared out the codes, do test-drive on the vehicle to affirm if the code arrives back.
• If the code fails to instantly come back, you might have an irregular setting.
• Irregular settings are proven to be very challenging to diagnose and in intense settings might have to get even worse before attempting to make a correct diagnosis.
• Apart from other diagnostic codes, this kind of code can occasionally be better lent to an experienced mechanical as it involves a bulk of circuitry.
• A certified mechanic with a specialty scanner might be able to find out the common location of the function crash even faster and easily than if a vehicle owner uses a code reader and a digital volt ohmmeter.
• Disengaging and inspecting every individual pin of the CAN bus is proven to be intensely time and expense preventive.
• In addition, a kind of memory saving apparatus has to be inserted, intentionally as the PCM and other controllers are losing their memory and need to be reprogrammed.
• A specialty diagnostic CAN scanner will display pin values and control module performance without exposing harm to a meltdown.
• It can consistently diagnose computer and circuitry errors by inspecting vehicle performance when the vehicle is running.
• To diagnose this kind of code by utilizing a digital volt ohmmeter would necessitate probing circuits of the thousands at your independence.
• An incorrectly positioned probe might wreck costly control modules and need for the vehicle be completely reprogrammed. Above all, you might try to conduct a progression inspection after all control modules are disengaged, and this might need 40 hours or more of service, which relies on the vehicle.
• Few vehicle demands are built with up to 18 individual control modules. If you decide to challenge yourself at this complex duty, start with a cautious visible test of all system circuitry, connectors, and fuses.
• Control module ground circuits should be inspected for progression with battery ground.
• These kinds of codes are often a result of faulty or disengaged system grounds.
• A supplementary ground cable can be supportive in diagnosing system ground inconsistencies.
• The engine and transmission ground cables, straps, and wires are occasionally kept hanging after conducting the repair.
• Observe for loose or damaged electrical connectors that might raise circuit resistance and result in these kinds of codes to being stored. Acquire a CAN bus system wiring diagram and/or pin out value chart, and then utilize the digital volt ohmmeter to inspect progression between separate controller connectors.
• Match up your detection with the vehicle producer’s rooted values and repair open or shorted circuits as needed.
• It is recurrently more economical to replace faulty wiring instead of trying to remove it out of the multiplex web of wiring harnesses.

Common Mistakes When Diagnosing the P2677 Code

All symptoms and supplied codes that are current in response to a failed reading are recurrently wrongfully diagnosed and adjusted as a result of the error. Apparently, this results in an adjustment without any success. Engine discharge codes, lean exhaust codes, fuel injector codes, and nearly all other drivability or transmission code that is supported by a controller communication code can possibly be an unsuspected danger for a wrongful diagnosis. Read the policy that states to diagnose codes in a sequence to which they are being stored and you will upgrade your chances for a making a very successful diagnosis. Use freeze frame information to assist you to find out which codes were stored in advance.