P0625 code definition
When code P0625 is stored it means that a problem in the generator field control circuit has been detected by either the PCM or a supporting control module.
What the P0625 code means
This code means that something has gone wrong with the generator field control circuit. Examples of control modules that may catch this problem include, but are not limited to the antilock brake control module, the body control module, the alternative fuel control module, the instrument panel control module, the turbo control module, the fuel injection control module, the cruise control module, the anti-theft module, the proximity alert module, the traction control module and the climate control module.
Depending on the module that catches it, though, it could take as many as eight incidents before the Check Engine Light is activated.
What causes the P0625 code?
The P0625 code is unique because, unlike the majority of other PCM codes, this one is usually caused by a defective generator or a problem with the generator control module. Many of the circuits for the generator control are incorporated into the PCM.
Other possible causes include:
- Open, shorted or corroded connectors or wires in the CAN bus harness
- A defective CAN bus
- A control module ground strap that is loose
- A ground wire that is damaged or broken
What are the symptoms of the P0625 code?
Symptoms that indicate a P0625 code may have been stored include a tough time shifting. The engine may even stall or you might find that it begins to vibrate or make a weird noise when you’re in idle.
A discharged battery could also occur. There are a number of other drivability issues that will tell you something is wrong too. Accelerating is usually difficult after this code is stored and fuel efficiency will most likely suffer too.
If the module that catches it needs several incidents before it will store the code, it may still record a pending for the original one.
How does a mechanic diagnose the P0625 code?
Your mechanic will begin by finding out which codes have been stored. An OBD-II scanner will be sufficient for this job. Then they’ll most likely move onto visually inspecting all of the wires and connectors. They’ll do the same for the control modules as well.
The CAN (Controller Area Network) may need to be inspected too. This could involve disconnecting every single pin to do so, which would mean using a diagnostic CAN scanner and a memory-saving device.
Common mistakes when diagnosing the P0625 code
This code can represent a lot of different underlying issues with communication. Unfortunately, the symptoms often get diagnosed as the problems and the focus of repairs. Doing so leaves the main problem unfixed. Diagnose and repair codes in the order in which they were stored. Utilizing freeze frame data will help with this.
How serious is the P0625 code?
The heart of the problem relates to the CAN. To put it simply, the CAN control practically every electrical function that occurs within your vehicle. The PCM serves as the primary controller. Therefore, if you let this problem continue, it’s only a matter of time before more and more symptoms begin popping up.
What repairs can fix the P0625 code?
The exact steps your mechanic takes will depend on the specifics of the codes that were stored. However, they will most likely:
- Replace any damaged electrical components (this includes blown fuses)
- Replacing the control module ground strap
- Disconnecting all of the CAN’s pins to test them (this takes a long time and can be very expensive so should therefore be the last step)
Additional comments for consideration regarding the P0625 code
Just remember that after each repair, you need to reset the system to see if any other problems are out there. Anything that happens to the CAN could make a number of other things go wrong.
Need help with a P0625 code?
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