OBD-II code · Network
U0030 Powertrain Sensor Data Bus
A fault has been detected on the dedicated powertrain sensor data bus (a sub-bus used for high-speed sensor data such as crank, knock or wheel-speed). Symptoms range from rough running to limp-home, depending on which sensor stream is missing.
Is it safe to drive with U0030?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor data bus wiring damaged
- PossibleSensor module on bus 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
- Sensor Data Bus, Can Bus Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.