What do you feel? The engine suddenly shuts off while you’re driving and takes a long time to restart. In other cases, the car runs, but the accelerator doesn’t respond at all (the engine gets stuck at 1200 RPM, in a fast idle).
The Logic of the System: This code is a “self-diagnosis” from the engine computer. It’s saying: “I tried to process a mathematical calculation here and the result was wrong.” It’s an integrity error. The control unit monitors itself to ensure it won’t accelerate the car on its own, for example.
- Possible Solution: Although it may seem like the power plant has burned out, 90% of the time the problem is… faulty power supply. If the battery terminals are loose or if the ground cable (earth) to the engine block is loose, the control unit will “stutter” due to lack of power and generate error code P1631. Clean the main ground connection and ensure the battery has more than 12.5V. If the problem persists, a software “reflash” (reinstallation) at the dealership may be necessary.
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