VOLVO
PAM-B1B4801 - Rear Left Outer Sensor. General Failure Information. General electrical failure
System
Parking Assistance Module (PAM)
Volvo models this fault code applies to
Applies to the following models:
6 modelsS60 (2011–), S80 (2007–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The parking assistance module (PAM) monitors the DC voltage in the signal wire to the outer left rear sensor and has registered an incorrect value for a longer period. It is a general electrical fault code, and the cause may be a loose sensor, a short to ground, oxidation in the connectors or a break in the supply.
Possible causes
- Parking sensor poor contact
- Short-circuit to ground in the wire
- Contact resistance or oxidation in the connections
- Short-circuit in the connections
- Open circuit in the voltage supply wire
What you can do
- 1Read and clear the code, then test drive the car to see whether it comes back
- 2If B1B5711 or B1B5811 is also stored, start the fault tracing there: they point to a short to ground in the sensor supply wire
- 3If you have a diagnostic tool, read the fault data for the outer left rear sensor and see whether it shows a fault on the signal
- 4Check that the connectors at the sensor and along the wire to the parking assistance module are firmly seated and free from oxidation
- 5Use a multimeter to check that the supply wire to the sensor has no contact with ground and no break
- 6If the wiring is intact, have a workshop trace the fault further
Symptoms you may notice3
- The parking assistance does not work
- The information lamp is lit
- Message in the text display
General guidance for car owners. Diagnosis on the car can point to a different cause.