u1218 Peugeot | What It Means & How to Fix

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Interaction between electronic units

Code: U1218 - The intelligent switching device (controls electronics) is sending incorrect data to the system, which may affect how some electronic features work.

Error U1218 on Peugeot means that the system received incorrect data from the intelligent switching device (BSI - Built-in Systems Interface). BSI is the central electronic unit of the vehicle, which controls the lights, windows, alarm, and other functions.

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.

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.

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