Error Code P2657: What It Means & What To Do?

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Stressed? Don’t know where to start from? Here’ all you need to know about the error code. OBD-II decreased engine performance is determined as a “A” rocker arm actuator system performance/stuck off. All the latest vehicles these days use variable valve technology for increased airflow through the engine at higher RPMs. This allows for better performance over a wider range.

Some manufacturers are shifting to the use of a variable valve system that allows the valve to open by a wider margin. Position sensors are placed internal to the variable lift rocker arm assembly so that the engine computer (PCM) can monitor what the assembly is doing. The code P2657 is set in case of failure of the solenoid inside the assembly.

What causes this problem with the Rocker Arm Actuator System Stuck On Bank 2 ?

• Less or excessive engine oil
• Fault in engine oil type
• Malfunctioning ‘A’ rocker arm actuator
• Corroded or loose ‘A’ rocker arm actuator harness
• Poor electrical connection in the ‘A’ rocker arm actuator circuit

1. Engine Oil - Love travelling but can’t figure out the reason behind these unexplained halts? Well, it is likely caused due to bad or wrong type of engine oil present. We advise you to get it changed instantly in order to avoid further complications.
2. Rocker Arm - Seeing the error code P2657 flashing? Well, it could be due to a corroded rocker arm. This can further cause problems including a poor fuel economy and diminishing engine performance. We advise you to get your rocker arm replaced or repaired now.
3. Rocker Arm Position Sensor - The fuel pump’ chief task is to monitor the flow of fuel in the vehicle. So a faulty one can really be problematic triggering a whole lot of problems. Tune into Parts Avatar now to get yours changed.
4. Powertrain Control Module - Inefficient engine performance, unexplained drops in the fuel economy and also problems in shifting the gears when in transmission are some common issues that follow a malfunction in the powertrain control module. Tune into Parts Avatar if you want to get rid of these problems caused by the error code P2657.
5. Rocker Arm Solenoid - Wishing to combat the problems caused by the error code P2657? Well, we advise you to get your rocker arm solenoid fixed as soon as possible.

Interested in knowing the symptoms to obd code P2657? If yes, then you have arrived at the right place. We at PartsAvatar have listed out few common symptoms associated with this fuel injector problem.

Common Symptoms

• Diminishing engine performance
• Poor fuel economy

After understanding the symptoms and few common causes behind the OBD error code, we are here to help you out in understanding the ways and means to correct the issue. To solve any issue you need to follow certain steps, and to solve OBD error code P2657, you will need to undergo the following replacements:

• Repair or replace a malfunctioning ‘A’ rocker arm actuator
• Replacements and repairs should be performed to fix the 'A' rocker arm actuator harness that is open or shorted
• A weak electrical connection in the 'A' rocker arm actuator circuit should be restored immediately
• Also, make sure that the oil levels and pressure are checked while performing the inspection. Perform changes as per the requirements

Apart from the fuel injector, you might need to undergo few more replacements. You might need solenoid, rocker arm, powertrain control module, overfilling engine oil, position sensors and many other parts. Where to get them from? Well, if you want quality parts, then we can prove to be your dream destination.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2657 code to be stored:

• Electromagnetic sensors are monitored using crankshaft and camshaft positions.
• The relief holes in camshaft and crankshaft drive gears are utilized by these sensors to provide signal interruption of the electromagnetic field.
• The PCM sees the interruptions in the electromagnetic field as square waveform patterns, which represent changing degrees of voltage.
• The electromagnetic resistance in the 5-volt circuit is utilized to create these variations in voltage.
• Some manufacturers use numerous crankshaft sensors to feed separate data streams to the PCM.
• Typically, the input for engine ignition and fuel ignition timing is provided by these data streams.
• Engines that are equipped with many camshafts usually utilize a camshaft for each camshaft
• Other automakers make use of notches cut into shafts or nodules that are permanently attached to interrupt the electromagnetic field.
• Depending upon the sensor placement, these notches or nodules are usually placed near the rear or middle of the shaft.
• Automakers can even place the transmission bell-housing below the crankshaft sensor and read crankshaft position from interrupter holes in the flex plate.
• The first step for a proper diagnosis should be confirming that all engine timing indicators are properly aligned.
• After completing the first step, advance to the next step that involves testing belt or chain deflection using manufacturer’s requirements.
• If timing components prove to be properly aligned and in good working condition, test the VVT or VCT solenoids.
• Cases of PCM and sensor failure are rare.
• Sensors are less prone to failures as compared to electrical wiring and connectors, especially where oil or other corrosive fluids are present. Several tools will be necessary in successfully diagnosing this code.
• For performing a successful diagnosis, a suitable OBD-II scanner (or code reader), a digital volt/ohmmeter and an oscilloscope will be most helpful.
• You will also require a manufacturer’s service manual (or the equivalent)
• Start with a visual interrogation of all wiring and connectors.
• Mend or replace defective, disconnected, burnt or corroded wiring, connectors, and components as required.
• To ensure success, always retest the system after repairs have been completed. If all system wiring, connectors, and components (including fuses) seem to be in normal working condition, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data.
• This information may be very helpful for the diagnosis of intermittent conditions that may have contributed to this code being stored.
• Proceed by clearing the code and operating the vehicle to check if it returns.
• This will help to check if the malfunction is intermittent or not
• Once the codes are cleared, the vehicle has to be test driven to check whether the code returns.
• In case, the code fails to immediately return, this may indicate an intermittent condition.
• Diagnosis of intermittent conditions can prove to be quite difficult and in extreme cases may have to be allowed to become worse before an accurate diagnosis can be made. Check for a reference voltage signal (usually 5-volts) and a ground at the connector end (key on/engine off) after disconnecting the connector from the affected sensor.
• In case reference voltage and/or ground are not detected, the connector should be disconnected from the PCM and all circuits should be tested for resistance and continuity.
• Refer to the manufacturer’s service manual for wiring diagrams, technical service bulletins, and/or flow charts that may be useful.
• Mend or change circuits, connectors, or components that do not comply with manufacturer’s requirements, as needed.
• After the required repairs have been made, clear codes and test drive the vehicle to confirm that the repair has been successful. If reference voltage and ground signals are present, the sensor should be reconnected and the oscilloscope should be utilized to monitor live data waveform patterns.
• Check for any abnormalities in the waveform and change the sensor in question if present
• Once the repairs have been made, clear codes and test drive the vehicle to make sure that your repairs have been successful. If wave for patterns appear to be normal, this indicates a defective PCM.
• An important point to remember is that PCM failure is rare and replacement will require reprogramming.
• Particular applications need camshaft and crankshaft sensor replacement in sets.
• Refer to your service manual for specific instructions.

Common Mistakes When Diagnosing the P2657 Code

• Here we have listed a few common mistakes:
• Failed powertrain control module (PCM)
• Damaged variable valve lift controller assembly
• Wiring problems in the system