What does fault code ECM-1632 mean?

Diagnostic fault code details for ECM-1632 (Volvo C30 (2007–2013), Volvo S40 (2004–2013), Volvo V50 (2004–2013)). Repair service at OBD Tuning.

VOLVO

ECM-1632 - Generator. Faulty signal

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

3 models

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

Show models by year and engine (3)

What does this fault code mean?

The engine control module (ECM) monitors the charging from the alternator. If it finds that the signal from the alternator is faulty while the engine runs, fault code ECM-1632 is set.

Possible causes

Damaged alternator

What you can do

1Switch off the ignition and check that the connectors at the alternator are firmly seated and free of oxidation
2With a multimeter, check that the alternator signal wire is not broken and is not short-circuited to ground or voltage
3Check that the fuses in the charging circuit are intact
4If the fault remains, have a workshop check the alternator

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.