What does fault code ECM-P163209 mean?

Diagnostic fault code details for ECM-P163209 (Volvo C30 (2007–2013), Volvo S40 (2004–2013), Volvo S60 (2011–)). Repair service at OBD Tuning.

VOLVO

ECM-P163209 - Smart Alternator Faults Sensor / Circuit. General Failure Information. Component Failures

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

9 models

C30 (2007–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V70 (2008–)

Show models by year and engine (9)

What does this fault code mean?

The engine control module (ECM) has received a message from the alternator control module (ACM) indicating a probable mechanical fault in the generator. The ACM controls and monitors the generator, and the ECM receives its status over LIN communication.

Possible causes

Damaged auxiliary unit belt and belt tensioner
Damaged freewheel
Damaged generator
The rotor in the generator is jammed, for instance by rust, dirt or loose objects

What you can do

1Check that the fuses are intact. Their locations are given in the owner's manual
2Check that the auxiliary unit belt and belt tensioner are not damaged
3Check the freewheel on the generator: a working freewheel lets the rotor shaft turn only one way, not the other
4Check that the generator is not blocked by rust, dirt or loose objects
5Check the battery charge and that the battery terminals are tight

Symptoms you may notice5

A text message and a warning symbol appear in the display, sometimes with a red symbol
An unusual noise may come from the generator
The battery may be dead or have low voltage
The charge warning lamp lights or behaves abnormally
The engine does not start, sometimes or all the time

What the fault can affect1

The charge regulator charges with a fixed voltage

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