OBD2 code B0291: Air conditioning/Comfort - HVAC
Air conditioning/heating malfunction.
Detected Root Component
Body Component
Observed Symptoms
- Air conditioning not working
- Dashboard errors
Possible Causes
- Faulty air conditioning compressor
- Insufficient refrigerant charge
- Faulty solenoid valve
- Faulty ventilation motor
Tools Required
Interactive Diagnostic
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Diagnostic Result
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Parts likely to be the cause (Boîtier fusibles / BSI)
Boîtier fusibles / BSI
Photo d'illustration : Boîtier fusibles / BSI
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Frequently asked questions about code B0291
What does code B0291 mean? ▾
OBD2 code B0291: Air conditioning/Comfort - HVAC. Air conditioning/heating malfunction.
What are the symptoms of code B0291? ▾
Code B0291 may cause: Air conditioning not working, Dashboard errors. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code B0291? ▾
The most common causes of code B0291 are: Faulty air conditioning compressor, Insufficient refrigerant charge, Faulty solenoid valve, Faulty ventilation motor. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code B0291? ▾
Code B0291 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.
How do I fix code B0291? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Faulty air conditioning compressor, Insufficient refrigerant charge, Faulty solenoid valve, Faulty ventilation motor. Difficulty: Medium · Estimated time: 30-60min.