VOLVO
PAM-U000188 - High Speed CAN Communication Bus. Bus Signal / Message Failures. Bus off
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 faulty messages on the high-speed CAN network, and the module has switched itself off from the network (bus-off). The cause is either contact resistance or oxidation in the connectors, or an open circuit in one or both CAN wires in part of the network.
Possible causes
- Contact resistance or oxidation in the connectors
- Open circuit in one or both CAN wires in part of the network
What you can do
- 1Read and clear the code, then test drive the car to see whether it comes back
- 2Check that the connectors on the CAN wires to the parking assistance module are firmly seated and free from oxidation
- 3Check whether codes are stored in the other control modules, since a fault on the CAN network can show up in several modules at once
- 4If you have a diagnostic tool, check whether communication codes are stored in the central electronic module (CEM)
- 5Have a workshop measure the resistance in the HS-CAN network and look for breaks in the wires
- 6Have a workshop find the control module that communicates incorrectly, since it is not always the one that stored the code
Symptoms you may notice3
- Front or rear parking assistance does not work
- Yellow warning symbol and text message in the display
- Text message in the display
What the fault can affect2
- The parking assistance module switches itself off from the CAN network and stays off until the power supply is interrupted
- When the car is restarted, the control module tries to communicate again
General guidance for car owners. Diagnosis on the car can point to a different cause.