U0032–U0071 Vehicle Communication Bus A (+) shorted High (to B+)
A wire in this circuit is touching a live positive feed, so the part sees power when it shouldn't.
Can you drive it? This is a communication fault on the car's data network. What it affects depends on the modules involved - a silent engine or gearbox module can bring on warning lights and limp mode, a comfort module only its own features. Check the power, earth and connector of the module named in the code, or the network wiring, first.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
U0032 | Vehicle Communication Bus A (+) shorted High (to B+) | Investigate soon |
U0035 | Vehicle Communication Bus A (-) shorted High (to B+) | Investigate soon |
U0041 | Vehicle Communication Bus B (+) shorted High (to B+) | Investigate soon |
U0044 | Vehicle Communication Bus B (-) shorted High (to B+) | Investigate soon |
U0050 | Vehicle Communication Bus C (+) shorted High (to B+) | Investigate soon |
U0053 | Vehicle Communication Bus C (-) shorted High (to B+) | Investigate soon |
U0059 | Vehicle Communication Bus D (+) shorted High (to B+) | Investigate soon |
U0062 | Vehicle Communication Bus D (-) shorted High (to B+) | Investigate soon |
U0068 | Vehicle Communication Bus E (+) shorted High (to B+) | Investigate soon |
U0071 | Vehicle Communication Bus E (-) shorted High (to B+) | Investigate soon |
The definition
U0032: Vehicle Communication Bus A (+) shorted High (to B+).
U0032 is a network code (communication between control modules), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.
What to check first
Cheapest and fastest checks first:
- With the connector unplugged and ignition on, check whether the signal pin already has battery voltage on it. It should not.
- Check for a chafed wire lying against a live feed, especially in looms that run alongside the starter or alternator cabling.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads your engine ECU's fault codes and the live measuring blocks behind them, and clears the codes once you have fixed the fault. On the engine it also does what a generic OBD reader cannot on a VAG: coding, adaptations, and Stage 1–3 flashing on Bosch ME7 petrol ECUs, with a backup saved every time it reads your ECU.
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Common questions
What does U0032 mean?
U0032 means Vehicle Communication Bus A (+) shorted High (to B+). A wire in this circuit is touching a live positive feed, so the part sees power when it shouldn't.
Can I drive with U0032?
This is a communication fault on the car's data network. What it affects depends on the modules involved - a silent engine or gearbox module can bring on warning lights and limp mode, a comfort module only its own features. Check the power, earth and connector of the module named in the code, or the network wiring, first.