OBD-II code · Network
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.
Is it safe to drive with U0032?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyBus high line shorted to battery
- PossibleTransceiver in one node failed
- Less likelyGateway module routing CAN messages incorrectly
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Bus A Wiring, Bus A Transceiver
Related codes
- U0041Vehicle Communication Bus B (+) High
- U0059Vehicle Communication Bus D (+) High
- U0068Vehicle Communication Bus E (+) High
- U0080Vehicle Communication Bus B (+) High
- U008DVehicle Communication Bus G (+) High
- U0096Vehicle Communication Bus H (+) High
- U0029Vehicle Communication Bus B
- U0030Powertrain Sensor Data Bus
- U0031Vehicle Communication Bus C (+) Open
- U0033Vehicle Communication Bus A (-) Open
- U0034Vehicle Communication Bus A (-) Low
- U0035Vehicle Communication Bus A (-) High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.