The OBD code C1391 for Toyota 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.
| 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 Toyota c1391 OBD Code
The vehicle may exhibit ABS warning light illumination and possible loss of ABS functionality.
- 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 during braking.
- Unusual noises from the ABS system.
Causes of the Toyota c1391 OBD Code
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Possible triggers for Toyota 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 Toyota Error Code c1391 Step By Step
Resolve Toyota fault code C1391 by inspecting and repairing the malfunctioning brake pressure sensor circuit.
- To fix Toyota OBDII code C1391, first, review the possible causes related to the ABS system.
- Visually inspect the ABS wiring harness and connectors for any damage.
- Check the connector pins for signs of being broken, bent, pushed out, or corroded.
- Ensure all connections are secure.
- If no issues are found with the wiring, consider resetting the ABS module using a scan tool.
- Perform a software update on the ABS module if necessary.
- Replace the ABS module if resetting and updating do not resolve the C1391 fault code.
Cost Of Fixing Toyota c1391 Fault Code
The repair for Toyota fault code C1391 typically involves replacing the malfunctioning brake pressure sensor.
The cost to diagnose and fix Toyota OBD code C1391 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
The final cost depends on shop rates, complexity of the issue, and any additional parts or labor needed for the repair.
Details of the Toyota c1391 OBD Code
Toyota fault code C1391 relates to a malfunction in the engine immobilizer system.
OBD code C1391 for Toyota vehicles indicates a malfunction 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 the ECM cannot communicate properly with the immobilizer system, it sets code C1391. This can be caused by issues with the immobilizer system components, such as the key transponder, immobilizer ECU, or wiring/connectors between these components.
Mechanic’s Tech Notes
For Toyota code C1391, check for issues with the malfunctioning stop light switch.
OBDII code C1391 in a Toyota typically indicates a fault with the engine control module (ECM).
To diagnose, check the ECM power and ground using a voltmeter.
Use a scan tool to communicate with the ECM over the Controller Area Network (CAN) network.
If the ECM does not respond, inspect the wiring harness and connectors for any damage, corrosion, or loose connections.
Ensure connector pins are intact.
Reflashing the ECM may be necessary to resolve the issue.
FAQ
OBD code C1391 in a Toyota indicates a fault in the Brake Actuator Assembly circuit. Check for fluid leakage, faulty assembly, or wiring issues. Inspect and repair as needed.
Code C1391 in a Toyota may cause ABS and Engine warning lights to illuminate. Common causes include fluid leakage and issues with the brake actuator assembly. Inspect wiring and connectors for damage.
Diagnose OBD code C1391 in Toyota: Symptoms ABS & Engine Light ON. Causes Fluid Leakage, Faulty Brake Actuator. Fix Inspect wiring harness, connectors, and components for damage.
Wrap Up
If your Toyota is displaying OBDII code c1391, you may experience issues with the brake system, such as ABS warning lights, traction control malfunctions, or decreased braking performance.
This code typically indicates a problem with the brake fluid pressure sensor circuit, faulty sensors, or wiring issues in the ABS system.
To address Toyota OBDII code c1391, start by inspecting the brake fluid level and quality.
Check the wiring harness and connectors for any signs of damage or corrosion.
Test the brake fluid pressure sensor for proper operation and replace it if necessary.
Ensure all ABS system components are
