Error Code P2679: What It Means & What To Do?

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The trouble code P2679 can be defined as Coolant Degassing Valve Control Circuit Low. It is the coolant degassing valve which would allow the coolant which has been vaporized to return to the pressurized overflow tank. Now if the valve would not work as per the request by the engine computer (PCM), then the P2679 fault code would start appearing.

The coolant degassing valve control circuit is being monitored by the engine control module. This trouble code would be set by the ECM when the coolant degassing valve control circuit would not be as per the specifications set by the manufacturer. The engine control module, powertrain control module or the transmission control module monitors this circuit depending upon the particular automobile.

What causes this problem with the Coolant Degassing Valve Control Circuit Low?

• Some flaws in the coolant degassing valve
• Coolant degassing valve harness might be opened or sometimes shorted
• Coolant degassing valve circuit might have inadequate electrical connection

1. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
2. Manual Transmission Shifter - Many a times the manual transmission shifter fails due to stretching. It is very common with automobiles which have manual transmissions as the driver moves the shifter more frequently. Buy top notch manual transmission shifter from us at economical prices.
3. Speed Sensor - Do you know the symptoms of bad speed sensor? If there would be a failure in the speed sensor, then you might notice harsh or improper shifting, cruise control might not work and at the same time the check engine light would start flashing. You can always rely on us as we have best auto parts for our customers.
4. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
5. Engine Coolant Temperature Sensor - The engine coolant temperature sensor is also known as the coolant temperature switch. It is an engine management system sensor which is utilized to monitor the temperature of the engine’s coolant. If there are any faults in the ECT sensor, then it would lead to engine performance issues. Purchase high grade engine coolant temperature sensor from us online.
6. Coolant Hoses/Pipes - Damaged hoses and pipes can cause leakages and thus reduce the effectiveness of the cooling system. Thus, cracked and damaged pipes must be replaced immediately.
7. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
8. Automatic Transmission Module - Faulty transmission module can cause problematic down shifts and upshifts, leading to stalling while accelerating or slowing down. This can also hamper many transmission system parts. Thus, replace it now!
9. Diagnostic Tools - It is always advisable to use correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in efficient manner. Buy new quality diagnostic tools from us today!

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P2679 code by mentioning some major symptoms below:

Common Symptoms

• The service engine soon light can start lighting up

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2679:

• You must fix the burned wiring
• Make sure to mend the faulty coolant degassing valve
• It is essential to restore the flawed circuitry and connectors as per the requirement
• Repair or replace the quirky electronic pressure regulator
• Rehabilitate the defaults in the shift solenoids
• The malfunctioning coolant degassing valve harness should be repaired or replaced as per the need
• Carefully adjust the clogged hydraulic passages
• Recondition the non-functioning pump
• It is necessary to perform proper service of the unsound coolant degassing valve circuit

However, if you face any issue then we have stocked a wide range of best priced ecm, pcm, shift solenoid, electronic pressure regulator, electronic pressure control solenoid, engine coolant temperature sensor, engine coolant system parts, vehicle speed sensor, wheel speed sensor, cruise control module and more to help you out in fixing your car.

Here are some steps which you should follow in order to diagnose this fault code:

This code generally appears in the automobiles which use an electronically controlled valve to remove the air (gases) from the engine coolant system. It is the PCM which controls the coolant degassing valve to utilize the input data from the engine coolant temperature sensor. You can always consult the automobile service manual for the location, operating characteristics, and voltage requirements of the coolant degassing valve control circuit, connectors, and components. This error code generally represents a fault in the controller area network, or "CAN". CAN stands for “controller area network.” The CAN represents a communication bus that would allow a number of micro controllers to communicate with one another without the need for a host computer. It is a message-based protocol initially designed for automotive use. The network of CAN bus is actually a complex conglomeration of wiring harnesses and connectors used as a pipeline of information which is shared between two or more automotive control modules. Every electrical function of the vehicle is virtually controlled by these controllers, with the powertrain control module being the primary controller. Control modules receive input data from various sensors and emit output signals to system constituents and other control modules. If this proves to be a CAN bus associated situation, then it could prove very challenging to diagnose by an amateur technician. Unlike other diagnostic codes, this type of code can sometimes be best left to a professional simply because of the bulk of circuitry involved. A technician which is experienced should use a specialized scanner (Auto hex or Tech II) to determine the general area of the malfunction much more rapidly and easily than someone using a code reader as well as a digital volt ohmmeter. If you will disconnect and check every single pin of the CAN bus then it can consume a lot of time as well as money. Also make sure to install some type of memory saving device, test the PCM and other controllers lose their memory and sometimes they might require reprogramming. A specialized diagnostic CAN scanner will depict pin values and control module operation without risking a meltdown. It can diagnose computer and issues related to circuitry correctly by monitoring automobile operation while the vehicle is being operated. If you want to diagnose this type of code using a digital volt ohmmeter, then it would entail probing thousands of circuits separately.

One probe which is misplaced could destroy expensive control modules and require that the vehicle be totally reprogrammed. At the most, you may attempt to perform a continuity test after all control modules are disconnected, and this could literally require 40-hours or more, based upon the automobile. There are some applications are equipped with up to 18 separate control modules. If you choose to tackle this monumental task, then you must start with a careful visual inspection of all system circuitry, connectors, and fuses. Control module ground circuits should be inspected for continuity with battery ground. Generally, the faulty system grounds are reason behind the occurrence of these types of codes. An auxiliary ground cable can be supportive in diagnosing system ground discrepancies. Engine and transmission ground cables, straps, and wires are sometimes left dangling once the repairs have been made. Search for loose or corroded electrical connectors that might rise the circuit resistance and cause these types of codes to be stored. Obtain a CAN bus system wiring diagram and/or pin out value chart, then use the digital volt ohmmeter to test continuity between individual controller connectors. You must compare your findings with the manufacturer’s referenced values and repair open or shorted circuits as per the need. It is more economical to restore the faulty wiring rather than attempting to remove it from the complex web of wiring harnesses.

Common Mistakes When Diagnosing The P2679 Code

• Nonperformance of the coolant degassing valve
• Failure in the car wiring
• The level of engine coolant might be very low
• The powertrain control module might not function properly

P2678 - Coolant Degassing Valve Control Circuit/Open