VOLVO
ECM-P163294 - Smart Alternator Faults Sensor / Circuit. Component Failures. Unexpected operation
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS80 (2007–), V70 (2008–)
Show models by year and engine (2)
What does this fault code mean?
The generator control module (ACM) has signalled to the engine control module (ECM) that the generator probably has a mechanical fault. The fault therefore concerns something that prevents or slows the generator's movement. The cause may be a damaged belt or belt tensioner, a faulty freewheel or a damaged generator.
Possible causes
- Damaged auxiliary unit belt or belt tensioner
- Faulty freewheel
- Damaged generator
What you can do
- 1Check that the auxiliary unit belt and belt tensioner are not damaged
- 2Check that nothing has caught in or is rubbing against the generator
- 3If the fault code returns after driving: have a workshop check the generator or try a new one
- 4After a repair: switch the ignition on, start the engine and read off the fault codes again
Symptoms you may notice3
- A text message and a warning symbol appear in the display
- The engine hesitates or surges during acceleration
- A noise comes from the generator
What the fault can affect1
- The charge regulator charges with a fixed voltage
General guidance for car owners. Diagnosis on the car can point to a different cause.