VOLVO
CEM-U201751 - Control Module Software #2. 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 an internal fault in its software. The module has not been programmed correctly, and the fault is stored when it starts up. It can affect starting, driving, cruise control, gauges and locking, since the CEM controls these functions.
Possible causes
- Faulty software installed in the central electronic module (CEM)
What you can do
- 1Read and note the code, clear it, then road test the car to see whether it comes back
- 2Has the car recently had new software or programming 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 reprogram the central electronic module (CEM) with the latest software
Symptoms you may notice5
- The engine cranks but does not start
- The car performs poorly and lacks power, especially when pulling away
- The car hesitates, surges or feels jerky when driving
- Cruise control cannot be engaged
- 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.