VOLVO
ECM-181D - Malfunction indicator lamp (MIL). Signal too low
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 drives the malfunction indicator lamp in the instrument panel. If the control signal to the lamp is too low, through a break or a short to ground, fault code ECM-181D is set.
Possible causes
- Control signal wire shorted to ground
- Open circuit in the control signal wire
What you can do
- 1Switch off the ignition and check the instrument cluster connectors for play and oxidation
- 2With a multimeter, check that the signal wire to the malfunction indicator lamp is not broken and not shorted to ground
- 3If you have a diagnostic tool: activate the malfunction indicator lamp and check that it lights
- 4If the fault remains, have a workshop check the instrument cluster and the wiring to the lamp
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.