OBD code C1391 indicates a fault in the Brake Actuator Assembly circuit.
Symptoms include the ABS Warning Light and Engine Light being illuminated.
Causes may include fluid leakage, a faulty brake actuator assembly, or wiring issues.
This issue is serious as it affects braking performance.
To fix, inspect wiring and connectors for damage, and check for any faulty components or corroded pins.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the c1391 OBD Code
The vehicle may experience issues with the engine control module communication circuit.
- With OBD code C1391, symptoms may include: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Difficulty stopping the vehicle smoothly.
- Decreased braking performance.
- Unusual noises coming from the brakes.
Causes of the c1391 OBD Code
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Possible triggers for fault code C1391 include ABS sensor issues and wiring faults.
- C1391 can be caused by fluid leakage.
- A faulty Brake Actuator Assembly.
- An open or shorted Brake Actuator Assembly harness.
- A poor electrical connection in the Brake Actuator Assembly circuit.
Fixing Error Code c1391 Step By Step
Address the ABS sensor circuit issue to resolve fault code C1391.
- To fix OBDII code C1391, first, review the ‘Possible Causes’ mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, check the wheel speed sensor wiring and connections for any issues.
- Test the wheel speed sensors for proper operation and replace any faulty sensors.
- Clear the fault codes and test drive the vehicle to verify if the issue has been resolved.
- If the code persists, further diagnosis may be needed to check the ABS module for faults or consider reprogramming or replacing the module if necessary.
Cost Of Fixing c1391 Fault Code
Repairing fault code C1391 typically involves replacing the brake pressure sensor in the ABS module.
The cost to diagnose and fix OBD code C1391 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Factors like shop rates and complexity can affect the final cost.
Details of the c1391 OBD Code
C1391 indicates a malfunction in the engine oil pressure sensor circuit.
OBD code C1391 means ABS Incorrect Data from Skid Control ECU.
This code is triggered when the Antilock Braking System (ABS) module detects incorrect data from the Skid Control Electronic Control Unit (ECU).
The ABS module monitors signals from various sensors such as wheel speed sensors and steering angle sensors to ensure proper operation of the ABS system.
When the data received from the Skid Control ECU is inaccurate or inconsistent, it triggers the C1391 fault code.
This code typically indicates a communication issue between the ABS module and the Skid Control ECU, which may be caused by wiring issues, faulty sensors, or a malfunctioning control unit.
Mechanic’s Tech Notes
Code C1391 indicates a malfunction in the engine oil pressure sensor circuit.
To diagnose and fix OBDII code C1391, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
If the TCM does not respond, reprogramming or reflashing may be necessary.
Visually inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
This thorough inspection can help identify and resolve issues related to code C1391.
FAQ
OBD code C1391 indicates a fault in the Brake Actuator Assembly circuit. Check for fluid leakage, faulty assembly, or wiring issues. Inspect and repair as needed.
Common symptoms for OBD code C1391 include ABS warning light on, engine light on. Causes: fluid leakage, faulty brake actuator assembly. Fix: Inspect wiring harness, connectors for damage.
Diagnose and repair OBD code C1391 by checking for fluid leakage, inspecting brake actuator assembly and harness for issues, and examining wiring harness and connectors for damage.
Wrap Up
If your ABS warning light is illuminated and you see OBDII code c1391, it may indicate a fault in the hydraulic pump motor circuit of the ABS system.
This could be caused by a malfunctioning hydraulic pump motor, damaged wiring, or poor electrical connections.
To address OBDII code c1391, start by inspecting the wiring harness and connectors related to the hydraulic pump motor.
Look for any signs of damage, corrosion, or loose connections.
Test the hydraulic pump motor for proper operation and replace it if necessary.
Ensure all electrical connections are secure and free of debris.
