VOLVO
ECM-4423 - Engine control module. Signal faulty. Intermittent fault
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsS40 (1996–2004), V40 (1996–2004)
Show models by year and engine (2)
What does this fault code mean?
The engine control module (ECM) has registered an internal fault in its internal reference voltage, the voltage the module uses internally. The fault is intermittent: it occurred on an earlier occasion, but it is no longer present when checked. The code is set in the engine control module.
Possible causes
- Signal fault in the module's internal reference voltage
- Defective engine control module
What you can do
- 1Note the fault code, erase it and test-drive the car to see whether the fault comes back
- 2Check that the fuses for engine management are intact and that the battery terminals are tight
- 3If the fault returns or the engine will not start, have a workshop check the engine control module, since the fault is inside it
Symptoms you may notice1
- The engine does not start
General guidance for car owners. Diagnosis on the car can point to a different cause.