The C1241 OBD2 fault code relates to the ABS Hydraulic Pressure Differential Switch Input To Ground 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.
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Symptoms
- Chassis warning light
- Specific symptoms vary by manufacturer
- May be accompanied by other DTCs
Common Causes
- Faulty component — internal damage or wear affecting the ABS Hydraulic Pressure Differential Switch Input To Ground
- 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
- Scan with OBD2 tool — Confirm C1241 is active. Check for additional chassis DTCs.
- Visual inspection — Examine the ABS Hydraulic Pressure Differential Switch Input To Ground wiring and connector for corrosion or damage.
- Check voltage and ground — Use a multimeter to verify proper reference voltage.
- Test component — Compare readings to factory specs. A stuck or erratic signal confirms failure.
- 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 ABS Hydraulic Pressure Differential Switch Input To Ground 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
- C1238 — ABS Hydraulic Pressure Differential Switch Input Circuit Failure
- C1239 — ABS Hydraulic Pressure Differential Switch Input Open Circuit
- C1240 — ABS Hydraulic Pressure Differential Switch Input Short Circuit To Battery
External References & Forum Discussions
- Forum discussion