VOLVO
IGM-U1A4B97 - Control Module Processor B. Component Failures. Component or system operation obstructed or blocked
System
Unknown System / Manufacturer Specific
Volvo models this fault code applies to
Applies to the following models:
1 modelV60 (2011–)
Show models by year and engine (2)
What does this fault code mean?
The code is stored when an internal fault has occurred in the microprocessor of the high voltage generator control module (IGM). Although the code is named blocked, it therefore applies to the microprocessor. The fault is only checked once the test has started at ignition on.
Possible causes
- Software fault in the IGM
- Internal fault inside the ISC voltage converter
What you can do
- 1Read out, clear the code and start the car to see whether it returns
- 2Have a workshop install new software for the control module if one is available
- 3If the fault remains, have a workshop check the IGM and the ISC voltage converter
- 4The high voltage system may only be handled by a workshop; do not work on it yourself
Symptoms you may notice5
- Warning symbol and text message in the display
- Warning about power supply problems from the alternator and charge regulator
- Charging of the high voltage battery while driving is absent, reduced or not working correctly
- High voltage battery is discharged or charges poorly
- HYBRID drive mode: the combustion engine is active all the time or too often
What the fault can affect1
- The high voltage battery cannot be charged by the combustion engine
General guidance for car owners. Diagnosis on the car can point to a different cause.