OBD2 code P8771: Powertrain System - Fault Detected – symptoms, causes & step-by-step diagnosis
P8771: Powertrain fault detected by the computer Common symptoms: Hybrid fault light on, Loss of engine power. Inspect Failed high voltage battery module.
Detected Root Component
Powertrain Component
Observed Symptoms
- Hybrid fault light on
- Loss of engine power
- Reduced electrical autonomy
Possible Causes
- Failed high voltage battery module
- Damaged wiring
- Faulty engine computer (ECU)
- Faulty cooling system
Tools Required
Interactive Diagnostic
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Diagnostic Result
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Parts likely to be the cause (Moteur (général))
Moteur (général)
Photo d'illustration : Moteur (général)
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Frequently asked questions about code P8771
What does code P8771 mean? ▾
OBD2 code P8771: Powertrain System - Fault Detected – symptoms, causes & step-by-step diagnosis. P8771: Powertrain fault detected by the computer Common symptoms: Hybrid fault light on, Loss of engine power. Inspect Failed high voltage battery module.
What are the symptoms of code P8771? ▾
Code P8771 may cause: Hybrid fault light on, Loss of engine power, Reduced electrical autonomy. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code P8771? ▾
The most common causes of code P8771 are: Failed high voltage battery module, Damaged wiring, Faulty engine computer (ECU), Faulty cooling system. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P8771? ▾
Yes, code P8771 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code P8771? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Failed high voltage battery module, Damaged wiring, Faulty engine computer (ECU), Faulty cooling system. Difficulty: Medium · Estimated time: 30-60min.