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.
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.
Common causes
- high
Bus high line shorted to battery
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-1650
- medium
Transceiver in one node failed
A plausible cause — test and verify before replacing parts.
Typical part cost: $90-1650
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for U0032.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for U0032.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for U0032.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does U0032 mean?
U0032 means "Vehicle Communication Bus A (+) High". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U0032?
bus high line shorted to battery; transceiver in one node failed; gateway module routing can messages incorrectly — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full U0032 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.