What does fault code ECM-0622 mean?

Diagnostic fault code details for ECM-0622 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C70 (2006–2013)). Repair service at OBD Tuning.

VOLVO

ECM-0622 - Generator. Faulty signal

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

4 models

C30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)

Show models by year and engine (11)

What does this fault code mean?

The engine control module (ECM) checks the charging voltage and the function of the generator. If the generator gives a signal that is faulty or outside the permitted range, the code is set. The fault may lie in the generator, the charge regulator or the connectors, and it can show up as power supply problems in the car.

Possible causes

Mechanical fault in the generator
Damaged charge regulator

What you can do

1Check the generator connector for looseness, contact resistance and oxidation
2Check that the drive belt is correctly fitted and that the generator is not noisy or behaving abnormally
3Check the signal wire to the generator for loose connections and breaks
4If you have a diagnostic tool, read the charging voltage in live data with the engine running; it should be steady and respond to changes in electrical load
5If the fault remains, have a workshop check the generator and charge regulator and replace them if needed

Symptoms you may notice1

Power supply problems in the car

General guidance for car owners. Diagnosis on the car can point to a different cause.