U0117 0 airbag control unit fault

What does error code U0117 0 mean?

Error code U0117 0 indicates a loss of communication (“Lost Communication”) between the airbag control unit (ECU) and another control module in the vehicle, typically the Electrical PTO Control Module. This points to a critical disruption in the CAN‑bus data network, compromising the functionality of the entire safety system.

Classified as a U‑code (Network Code), U0117 0 does not signify a fault in a single component but rather an issue with data transmission between control units. The airbag control unit can no longer send or receive valid signals, putting it into a safety mode and disabling airbag functions.

Electronically, this means that data packets on the CAN‑bus either fail to arrive, are corrupted, or the destination control unit fails to respond. Without this communication, the airbag system cannot react correctly in the event of a crash.

How do you recognize error U0117 0?

The primary symptom of error U0117 0 is a continuously illuminated airbag warning light on the instrument cluster. Additionally, during diagnostics via the OBD‑II interface, the airbag control unit may become unreachable, or the error may be logged as “permanent” or “intermittent” in the fault memory.

The active warning light clearly indicates that the airbag system has detected a serious fault and has been deactivated as a precautionary measure. In this state, the vehicle is no longer fully roadworthy, as the restraint systems would not deploy.

In some cases, the error code persists even after being cleared or reappears immediately. This suggests a permanent communication failure rather than a temporary loose connection.

What causes error code U0117 0?

The main cause of error code U0117 0 is a physical disruption in the CAN‑bus connection. This includes damaged cables, corroded or loose connectors. Less frequently, internal defects within the airbag control unit itself, faulty sensors, or software issues can interfere with communication and trigger the error.

A break or short circuit in the CAN‑bus wiring harness is the most common source of the problem. Wires located near moving parts, such as seats or the steering column, are particularly vulnerable.

An internal hardware defect in the airbag control unit can also be responsible. Faulty electronic components on the circuit board—such as resistors or capacitors—may disrupt signal processing and lead to communication failure.

In some cases, software problems or incorrect coding following modifications can prevent communication between control units. Similarly, crash data stored in the control unit’s memory may block normal operation.

Which vehicles are affected by U0117 0?

Error code U0117 0 occurs frequently in certain North American vehicle models. At Airbag24, this error code is especially diagnosed and repaired in Chevrolet vehicles, particularly sporty Camaro models spanning multiple generations.

Specifically, we have identified the following models where this error appears more often:

Chevrolet Camaro, 6th generation (model years 2016–2023)

Chevrolet Camaro ZL1, 5th generation

How is error U0117 0 professionally repaired?

Professional repair requires removing the airbag control unit and conducting a detailed analysis at both the hardware and software levels. At Airbag24, the unit is first inspected; any stored crash data is erased, and the software is checked for errors. Defective electronic components are then replaced to restore reliable communication permanently.

After sending the removed control unit to Airbag24, a standardized repair process follows. First, the fault memory is read to verify the reported U0117 0 code.

Next comes the technical restoration. If crash data was saved after an accident, it is deleted using specialized software. If a software error is suspected, reprogramming is performed. Should a hardware defect be present, the damaged components on the circuit board are expertly replaced.

Final tests on a test bench ensure that the control unit communicates flawlessly and functions fully again. We provide 2 years' statutory liability for defects on every repair.