What does fault code ECM-P033538 mean?

Diagnostic fault code details for ECM-P033538 (Volvo C30 (2007–2013), Volvo S40 (2004–2013), Volvo S60 (2011–)). Repair service at OBD Tuning.

VOLVO

ECM-P033538 - Crankshaft Position Sensor A Circuit. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal frequency incorrect

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 (11)

What does this fault code mean?

The engine control module (ECM) counts the magnetic poles on the magnet wheel using the crankshaft sensor and checks that the frequency of the signal is correct. If the frequency is wrong, the fault code is set. The cause may be play or oxidised connectors, a damaged magnet wheel or a damaged sensor.

Possible causes

Loose connection
Contact resistance or oxidation in the connections
Damaged magnet wheel
Damaged crankshaft sensor

What you can do

1Read the fault code, clear it and test drive the car to see whether it returns
2Check that the fuses are intact; their locations are shown in the owner's manual or on the fuse box cover
3Check the connectors at the crankshaft sensor for play, and that they are firmly seated and clean
4If you have a diagnostic tool: read the speed signal in live data with the engine running and see whether it is uneven or jumps
5Have a workshop with diagnostic equipment check the magnet wheel and the crankshaft sensor and replace the damaged part if needed

Symptoms you may notice2

The engine stalls
The engine does not start and only cranks

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