P0657 - OBD Trouble Code

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This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

The trouble code P0657 can be described as Actuator Supply Voltage “A” Circuit/Open. If the powertrain control module would detect some defect in the supply voltage to the “A” circuit, then the P0657 code would start appearing. This would also give rise to the illumination of the check engine light on the dashboard.

What causes this problem with the Actuator Supply Voltage “A” Circuit/Open?

• An open or shorted circuit between the engine sensors and the PCM
• The ground wire might not be connected properly
• There can be an open or shorted circuit in the PCM
• The two interfacing supporting control modules might have an open or shorted circuit between them
• Inoperative powertrain control module

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2. Powertrain Control Module - A broken Powertrain Control Module can cause a lot of issues. It would be nice if you get it replaced on time.
3. Auto Transmission Shift Solenoid - Everything is fine with the engine control module and still OBD code P0657 flashing? Then there is definitely some fault with the Auto Transmission Shift Solenoid. Get it checked and replace if needed.
4. Engine Control Module - Engine Control Module is an important car part which should never be neglected. May be there is some fault in it due to which P0657 code may start flashing.
5. Electronic Control Unit - Faulty Electronic Control Unit can cause a lot of issues. It would be nice if you get it replaced on time.

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P0657. They are mentioned here as follows:

Common Symptoms

• Difficulty in starting the car engine or it might not start at all
• Car engine running roughly
• The check engine light can start triggering up
• Lack of power and misfiring car engine

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 P0657:

• It is very important to secure and tighten the connectors of the powertrain control module and ground wires
• Make sure to repair or replace the PCM wiring harness
• You can always reprogram the powertrain control module
• Replacing the PCM if it has some faults

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Do you wish to diagnose P0657 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

• When the trouble code P0657 is being diagnosed, an OBD-II scanner would be used by a mechanic to identify the error code as well as other codes which are related to it.
• After that a visual inspection should be done to check the damaged, corroded, or loose wires or connectors
• If the circuits are not damaged, then an ohmmeter would be utilized to test the circuits for shorts as well as open connections
• Now once the cause of the problem is located, then the next step would be to diagnose it and fix it properly
• Carefully retest the system and ensure if the code is not stored again

Common Mistakes When Diagnosing The P0657 Code

When a P0657 code is stored, other codes may also be stored and symptoms may occur as a result of the breakdown in internal communication due to the open or shorted circuit. Resolving these symptoms will not solve the underlying problem, which is the open or shorted circuit. So, if other codes are found in relation to a P0657 code, you will almost always want to deal with the P0657 code first.