U0076Control Module Communication Bus D Off
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- GM is the main public user of U0076. In the 2019 tables for the Corvette LT5 engine, Bus D is the Powertrain Sensor CAN, a private link between the ECM and engine-side devices. The ECM sets the code when that bus has been off for one second after the controller has run for three seconds, Type B with MIL after two trips, and holds back its lost-message check toward the fuel level module meanwhile. On the 2020-22 Malibu 1.5 L, bulletin 21-NA-186 traces U0076 together with U18A2 and message counter faults to an ECM harness rubbing on its bracket; owners notice a Service Engine Soon lamp or an erratic fuel gauge. Unlike U0055, which describes the bus D wiring as a whole, this code reports that the ECM's own controller has fallen silent.
- What you may notice
- Service Engine Soon lamp or MIL on
- Fuel gauge erratic or wrong
- Message counter codes stored alongside
- Likely causes
- LikelyECM harness rubbing through on its bracket
- PossiblePoor contact at a connector of the engine-side sensor bus
- RareFaulty CAN transceiver inside the ECM
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.