VOLVO
CPM-U300047 - Control Module. System Internal Failures. Watchdog / safety µC failure
System
Combustion Pre-heater Module (CPM)
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?
The heater control module has registered an internal fault in the monitoring of its processor, a so-called watchdog or safety fault. The heater is switched off when the fault code is set, and if you start it again it makes a new start attempt. The fault comes from the control module itself.
Possible causes
- Internal fault in the heater control module
What you can do
- 1Start the heater again and check whether it runs normally. It may be a temporary fault that does not return.
- 2Check that the fuses for the heater are intact. Look in the car's manual to find where they are.
- 3If the fault is lasting, have a workshop download the latest software to the heater and then check that the fault has cleared.
- 4If the fault returns, have a workshop replace the heater control module.
Symptoms you may notice1
- The parking heater does not work
What the fault can affect2
- The heater is switched off when the fault code is set
- The heater makes a new start attempt if it is activated again
General guidance for car owners. Diagnosis on the car can point to a different cause.