The OBD code C1391 for Lexus indicates a fault in the Brake Actuator Assembly circuit.
Symptoms include the ABS and Engine warning lights being illuminated.
Causes may include fluid leakage, a faulty brake actuator assembly, or issues with the wiring harness.
This issue is serious as it affects the vehicle’s braking system.
To fix it, inspect the wiring harness and connectors for damage or poor connections.
| 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 Lexus c1391 OBD Code
The vehicle may experience issues with the ABS system due to fault code C1391.
- Symptoms: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Possible loss of ABS functionality.
- Brake pedal may feel different than usual.
- Unusual noises coming from the ABS system.
Causes of the Lexus c1391 OBD Code
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Possible issues with Lexus C1391 may stem from ABS sensor malfunctions or 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 Lexus Error Code c1391 Step By Step
Address the ABS/Traction Control System by inspecting wheel speed sensors and related wiring for Lexus code C1391.
- To fix the Lexus OBDII code C1391, start by reviewing the possible causes mentioned above.
- Visually examine the wiring harness and connectors related to the ABS system.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Test the ABS wheel speed sensors for proper operation and signal output.
- Check the ABS control module for any faults or malfunctions.
- Reset the ABS system by clearing the fault codes using a diagnostic scanner.
- If the issue persists, consider replacing the faulty ABS control module and perform any necessary programming or software updates.
Cost Of Fixing Lexus c1391 Fault Code
The repair for Lexus fault code C1391 typically involves replacing the malfunctioning skid control ECU.
The cost to diagnose and fix Lexus OBD code C1391 is typically based on an estimated repair time of 1. 0 hour.
Labor rates range from $75 to $150 per hour, so the total cost can vary depending on shop rates and the complexity of the repair.
Details of the Lexus c1391 OBD Code
Lexus fault code C1391 relates to a malfunction in the engine oil level sensor circuit.
Lexus OBD code C1391 means a malfunction has been detected in the engine immobilizer system.
This code is triggered by the Engine Control Module (ECM) when it detects a communication error with the immobilizer system.
The immobilizer system is designed to prevent the engine from starting without the correct key or key fob.
When this code is set, it indicates a problem with the communication between the ECM and the immobilizer system, which can prevent the engine from starting.
Mechanic’s Tech Notes
For Lexus code C1391, check for issues with the malfunctioning brake fluid pressure sensor.
To diagnose and fix OBDII code C1391 in a Lexus, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) network with 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 in a Lexus 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 Lexus OBD code C1391 include ABS warning light on, engine light on. Causes may be fluid leakage, faulty brake actuator assembly. Fix: Inspect wiring harness and connectors.
Diagnose OBD code C1391 in Lexus: Symptoms ABS & Engine Light ON. Causes Fluid Leakage, Faulty Brake Actuator, Wiring Issues. Fix Inspect wiring, connectors, and components for damage.
Wrap Up
If your Lexus is displaying OBD code c1391 along with ABS or traction control warning lights, it may indicate a fault in the brake pressure sensor circuit.
This could be caused by a malfunctioning brake pressure sensor, damaged wiring, or poor connections in the system.
To address Lexus OBD code c1391, start by inspecting the brake pressure sensor and its wiring harness for any visible damage.
Test the sensor’s functionality and check for loose or corroded connectors.
Replace the sensor if necessary and ensure all connections are secure to resolve the issue.
