VOLVO
ECM-1813 - System relay. Faulty signal
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 ECM monitors the system relay, which supplies power to the engine management. If the relay switches off in the wrong way, either too quickly or too slowly, fault code ECM-1813 is set.
Possible causes
- Low battery voltage
- Defective system relay
What you can do
- 1Check that the battery is charged and that the terminals are tight, since low battery voltage can cause the fault
- 2Switch off the ignition and check that the system relay in the engine bay relay box is firmly seated and its contacts are free of oxidation
- 3If you have a diagnostic tool: activate the system relay and listen for a click
- 4If the fault remains, have a workshop replace the system relay
Symptoms you may notice1
- The engine does not start
General guidance for car owners. Diagnosis on the car can point to a different cause.