VOLVO
PAM-B1B4812 - Rear Left Outer Sensor. General Electrical Failures. Circuit short to battery
System
Parking Assistance Module (PAM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The parking assistance module (PAM) has registered that the voltage in the signal wire to the outer left rear sensor is too high for a period of time. The cause may be a damaged sensor, or the signal wire having contact with supply voltage in the wire or the connectors.
Possible causes
- Damaged parking sensor
- The signal wire is short-circuited to supply voltage
- Short-circuit in the connections
What you can do
- 1Read and clear the code, then switch the ignition on again to see whether it comes back
- 2If you have a diagnostic tool, read the signal status for the outer left rear sensor, with and without the sensor connector attached
- 3With the ignition switched off, use a multimeter to check that the signal wire between the parking assistance module and the sensor connector has no contact with supply voltage
- 4Check the connectors at the sensor and the other connectors along the wire; if the wiring is intact but the fault remains, replace the sensor
- 5Have a workshop trace the fault further if it remains after these checks
Symptoms you may notice3
- Yellow warning symbol and text message in the display
- Text message in the display
- Front or rear parking assistance does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.