VOLVO
CEM-U201851 - Control Module Software #3. System Programming Failures. Not programmed
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsV40 (2013–), V40 Cross Country (2013–)
Show models by year and engine (2)
What does this fault code mean?
On the V40, the central electronic module (CEM) has found that its software is not programmed correctly. The fault is stored when the module starts and can affect engine starting, driveability, cruise control, gauges, climate control and central locking.
Possible causes
- Faulty software installed in the central electronic module (CEM)
What you can do
- 1Read and clear the code, then road test and see whether it returns
- 2If the car has recently had new software or a programming step that was not completed, tell the workshop
- 3Check that the battery is charged and the terminals are tight
- 4If the fault returns, have a workshop read the module and reprogram it with the latest software
Symptoms you may notice5
- The car performs poorly and lacks power, especially when pulling away
- The engine cranks but does not start
- The car hesitates, surges or feels jerky during acceleration and deceleration
- Cruise control does not engage
- Gauges show wrong readings or do not work
What the fault can affect1
- The functions of the central electronic module (CEM) are restricted
General guidance for car owners. Diagnosis on the car can point to a different cause.