VOLVO
ECM-721A - Immobilizer. Faulty signal
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
2 modellerS40 (2004–2013), V50 (2004–2013)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
The immobilizer gets a faulty signal because the BCM's hardware serial number differs from the one saved in the ECM. The fault applies to the S40 (04-) and V50, and the starter cranks but the engine will not run.
Mulige årsaker
- The programmed hardware serial number in the engine control module does not match the hardware serial number in the brake control module (BCM)
Hva du kan gjøre
- 1Read and note the code, clear it and switch the ignition on again to see whether it returns
- 2If you have a diagnostic tool: read the codes in the engine control module and see whether any other code is stored
- 3Has the brake control module or the engine control module been replaced recently? If so, their hardware serial numbers may differ
- 4Work on the brake control module (BCM) and its programming should be done by a workshop, as it controls the braking system
- 5If the fault remains, have a workshop with diagnostic equipment compare the numbers and program the engine control module if needed
Symptomer du kan merke1
- The starter cranks but the engine will not run
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