Causes of U1218 Error on Peugeot:
- BSI failure - a software error or freeze of the unit is possible.
- Wiring break or poor connection - connections between BSI and other modules may corrode or disconnect.
- CAN bus issue - data exchange between modules is disrupted due to a damaged cable or unstable power supply.
- Low voltage in the network - a discharged battery or generator problems may cause data transmission failures.
How to Fix Error U1218?
- Restart the system. Disconnect the battery for 10 minutes, then reconnect it - this may reset the error.
- Check the terminals and wiring. Make sure all connections are intact, especially near the BSI unit.
- Measure the battery voltage. If the voltage is below 12V, recharge or replace the battery.
- Use an OBD2 scanner to check for other errors. If there are CAN bus failures, the issue might lie in the connecting modules.
- If nothing helps - diagnostic at an electrician's. A reprogramming or replacement of the BSI unit might be necessary.
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Conclusion
DTC U1218 on Peugeot indicates a communication failure between control units. Most often, the issue is related to the BSI, CAN bus, or the battery. Start with a simple solution - restart the system and check the voltage.
20.09.2025
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