what does it mean if my Toyota Camry Eighth Generation (2018-present) has a C1231 code?

Toyota Camry Eighth Generation (2018-present)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

Error Code: C1231

3 min read

502 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix C1231 ABS issue in Toyota Camry Eighth Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

C1231

Affected Component

Brakes

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool down to avoid burns when working near brake components.

Symptoms

•ABS warning light illuminated on the dashboard
•Loss of ABS functionality
•Traction control warning light may also be illuminated
•Potential for longer braking distances under certain conditions
•Unusual noises or vibrations during braking

Diagnostic Steps

1
Scan the vehicle’s OBD-II system to confirm the C1231 code and check for any additional codes.
2
Inspect the ABS wheel speed sensors for damage, corrosion, or disconnection.
3
Check the wiring and connectors associated with the ABS system for wear or shorts.
4
Measure the resistance of the wheel speed sensors with a multimeter to ensure they are within the manufacturer's specifications.
5
Inspect the ABS control module for faults or internal failures.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Cleaning brush

Parts Required

•Wheel speed sensor (if faulty)
•Wiring harness (if damaged)

Related Faults

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Diagnostic Steps

1
Scan the vehicle’s OBD-II system to confirm the C1231 code and check for any additional codes.
2
Inspect the ABS wheel speed sensors for damage, corrosion, or disconnection.
3
Check the wiring and connectors associated with the ABS system for wear or shorts.
4
Measure the resistance of the wheel speed sensors with a multimeter to ensure they are within the manufacturer's specifications.
5
Inspect the ABS control module for faults or internal failures.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the ignition is turned off.

2. Inspect ABS Wheel Speed Sensors

Tools Required: Socket set, multimeter, cleaning brush
Remove the wheel to access the ABS sensor.
Visually inspect the sensor and the area around it for dirt or debris.
Clean the sensor and mounting area with a suitable cleaning brush.

3. Check Wiring and Connectors

Inspect the wiring harness connected to the ABS sensor for any signs of fraying or damage.
Ensure all connectors are securely fastened and free from corrosion.
Repair or replace any damaged wiring or connectors as necessary.

4. Test Wheel Speed Sensors

Tools Required: Multimeter
Disconnect the wheel speed sensor connector.
Set the multimeter to measure resistance (ohms).
Measure the resistance across the sensor terminals; refer to the service manual for the correct specification (usually around 1,000 to 2,000 ohms when cold).
If the resistance is out of spec, replace the wheel speed sensor.

5. Reset the ABS System

Tools Required: OBD-II scanner
After repairs, use an OBD-II scanner to clear the C1231 code from the system.
Perform a test drive to ensure the ABS light does not re-illuminate.