Network
generic / SAE
U0032
Vehicle Communication Bus A (+) High
The communication bus A high-side line (CAN-H or equivalent) is at a higher voltage than allowed. Likely short to power or a transceiver fault that pulls the line high.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 32
Possible causes
- Bus high line shorted to battery high
- Transceiver in one node failed medium
- Gateway module routing CAN messages incorrectly low
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 80–1500 €
- Estimated time: 1–6 h
- Component: bus a wiring
- Component: bus a transceiver
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012