VOLVO
CEM-5A61 - PTC heater. Faulty signal
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (19)
- Volvo C30 (2007–2013)2007–2009Engine B4184S11, B4184S8, B4204S3, D4164T, D4204T only
- Volvo C30 (2007–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4, D4164T, D4204T only
- Volvo C30 (2007–2013)2011Engine B4204S3, B4204S4, D4162T, D4164T only
- Volvo C30 (2007–2013)2012–2013Engine B4204S3, B4204S4, D4162T only
- Volvo C70 (2006–2013)2008–2010Engine D4204T only
- Volvo S40 (2004–2013)2004Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2005Engine B4184S11, D4164T, D4204T, D4204T2 only
- Volvo S40 (2004–2013)2006Engine B4184S11, B4184S8, D4164T, D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3, D4164T, D4204T only
- Volvo S40 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4, D4164T, D4204T only
- Volvo S40 (2004–2013)2011Engine B4204S3, B4204S4, D4162T, D4164T only
- Volvo S40 (2004–2013)2012Engine B4204S3, B4204S4, D4162T only
- Volvo V50 (2004–2013)2004Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2005Engine B4184S11, D4164T, D4204T, D4204T2 only
- Volvo V50 (2004–2013)2006Engine B4184S11, B4184S8, D4164T, D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007–2009Engine B4184S11, B4184S8, B4204S3, D4164T, D4204T only
- Volvo V50 (2004–2013)2010Engine B4184S11, B4184S8, B4204S3, B4204S4, D4164T, D4204T only
- Volvo V50 (2004–2013)2011Engine B4204S3, B4204S4, D4162T, D4164T only
- Volvo V50 (2004–2013)2012Engine B4204S3, B4204S4, D4162T only
What does this fault code mean?
The central electronic module (CEM) controls the power to the electrical additional heater through an output, and the fault code is stored when the signal on that output is faulty. It shows as poor heating in the passenger compartment, because the additional heater does not work as it should.
Possible causes
- Signal cable to the additional heater short-circuited to ground
- Faulty signal from the CEM output
What you can do
- 1Switch the ignition on, activate the electrical additional heater and check whether it gets warm
- 2If it does not warm up, the fault is probably permanent; if it warms up, the fault was present earlier but is not active now
- 3Check the control signal cable for chafing and pinching
- 4Use a multimeter to check that the control cable to the additional heater has no contact with ground (the body)
- 5Remedy what is found and check that the cabin heating improves
Symptoms you may notice1
- Poor heating in the passenger compartment
General guidance for car owners. Diagnosis on the car can point to a different cause.