The C1278 OBD2 fault code relates to the Steering Wheel Angle 1 and 2 Signal Faulted circuit. This is part of the vehicle's chassis control system. When a circuit failure occurs, the control module cannot properly monitor or regulate this system, which may affect braking, traction, stability, or suspension performance.

At AIscanAuto, we help drivers quickly identify OBD2 trouble codes, understand their root causes, and find the right fix — with AI-powered diagnostics that go beyond basic code reading.

Symptoms

• Stability control light on
• Steering feels different or heavy
• Vehicle pulls to one side
• Stability control not functioning
• Possible warning chime

Common Causes

• Faulty component — internal damage or wear affecting the Steering Wheel Angle 1 and 2 Signal Faulted
• Wiring issues — broken, corroded, or chafed wires in the circuit
• Connector problems — loose, oxidized, or moisture-damaged pins
• a general circuit failure is detected — can result from wiring faults, connector issues, or component failure
• Control module fault — rare, but the chassis control module may have an internal fault

Step-by-Step Diagnosis

1. Scan with OBD2 tool — Confirm C1278 is active. Check for additional chassis DTCs.
2. Visual inspection — Examine the Steering Wheel Angle 1 and 2 Signal Faulted wiring and connector for corrosion or damage.
3. Check voltage and ground — Use a multimeter to verify proper reference voltage.
4. Test component — Compare readings to factory specs. A stuck or erratic signal confirms failure.
5. Check for shorts/opens — Perform continuity tests on the wiring between the component and control module.

Repair & Solutions

• If the component is defective, replace the Steering Wheel Angle 1 and 2 Signal Faulted with an OEM or quality aftermarket part.
• Repair any damaged wiring or connectors using proper methods.
• Clear the DTC with an OBD2 scanner and test drive to verify the code does not return.
• If the code persists after component replacement, inspect the control module connector or consider module testing.

Related Codes

• C1275 — Solenoid Relay #1 Circuit Short to Vbatt
• C1276 — Park Brake Actuator Assembly Switch Applied Circuit Short to Gnd
• C1277 — Steering Wheel Angle 1 and 2 Circuit Failure

External References & Code-Specific Resources

1. Technical reference for C1278
2. Diagnostic guide for C1278
3. OBD2 code database