VOLVO
CEM-4A33 - Fuel level sensor. Faulty signal
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
5 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2007–2010
- Volvo C30 (2007–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
- Volvo C30 (2007–2013)2013Engine B4204S3, B4204S4, B5254T7 only
- Volvo C30 Electric (2011–2013)2011–2013
- Volvo C70 (2006–2013)2006–2007, 2011–2013
- Volvo S40 (2004–2013)2004–2010
- Volvo S40 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
- Volvo V50 (2004–2013)2004–2010
- Volvo V50 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
What does this fault code mean?
This variant applies to the C30, C30 Electric, C70, S40 and V50. The CEM registers that the fuel level sensor circuit is shorted to battery voltage or has a break. The fuel gauge then shows the wrong level, and the trip computer may show an empty tank too early.
Possible causes
- A damaged fuel level sensor
- An internal fault in the DC/AC converter
What you can do
- 1With the ignition on, check whether the fuel gauge shows a level that matches the fuel in the tank
- 2Check that the connectors at the CEM and at the fuel pump are seated and not corroded
- 3Use a multimeter to check that the supply wire to the sensor has no break or short to supply voltage
- 4If the wires are intact and the fault remains, have a workshop replace the sensor or the DC/AC converter, since this needs access to the tank
- 5After the work, clear the code and check that the level is shown correctly
Symptoms you may notice2
- The trip computer shows an empty tank too early
- The fuel gauge shows the wrong fuel level
What the fault can affect1
- The fuel level is set to zero
General guidance for car owners. Diagnosis on the car can point to a different cause.