VOLVO
IEM-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?
Although the code is named blocked, it relates to an internal fault in the microprocessor of the electric rear axle drive module (IEM). The fault is only checked once the test has started at ignition on, and the code is stored when the conditions are met.
Possible causes
- Software error in the electric rear axle drive module (IEM)
- Internal fault inside the ISC voltage converter
What you can do
- 1Read out, clear the code, start the car and 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 control module and the voltage conversion unit ISC
- 4Do not work on the electric rear axle or its high voltage system yourself; have a workshop carry out those checks
Symptoms you may notice4
- Warning symbol and text message in the display
- PURE drive mode disengages by itself or is not available
- AWD drive mode disengages by itself or is not available
- HYBRID drive mode runs with the combustion engine active all the time or too often
What the fault can affect2
- Electric propulsion is not possible
- Brake energy regeneration from the electric rear axle ERAD is not possible
General guidance for car owners. Diagnosis on the car can point to a different cause.