VOLVO
IEM-B201248 - Phase Current Sensors. System Internal Failures. Supervision software failure
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 surveillance software failure, it applies when the phase current sensors read too far apart from one another. The fault is set while driving in gear D or R. The causes may be connections between the electric rear axle (ERAD) and the voltage converter (ISC), a shorted high voltage cable, or internal faults in the ERAD or ISC. Electric propulsion is then not possible.
Possible causes
- Loose contacts, contact resistance or oxidation at the connections between the ERAD and the ISC
- High voltage cable short-circuited to ground
- Damaged wiring between the ERAD and the ISC
- Internal fault in the electric rear axle (ERAD)
- Internal fault in the voltage converter (ISC)
What you can do
- 1Have a workshop check the connections and wiring between the electric rear axle and the voltage converter (ISC). High voltage systems may only be handled by qualified personnel
- 2If you have a diagnostic tool: compare the phase currents with each other in live data during a drive in gear D or R
- 3Do not work on the high voltage cabling yourself
- 4After the repair, check that the code is not stored again while driving
Symptoms you may notice4
- Text window and warning symbol with a text message
- Drive mode PURE disengages automatically or is unavailable
- Drive mode AWD disengages automatically or is unavailable
- Drive mode HYBRID: the combustion engine runs all the time or too often
What the fault can affect2
- Electric propulsion is not possible
- Brake energy regeneration from the electric rear axle is not possible
General guidance for car owners. Diagnosis on the car can point to a different cause.