what does it mean if my Toyota Camry XV50 (2012-2017) shows a code C1231

Toyota Camry XV80 (2025-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: C1231

3 min read

507 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 malfunction in Toyota Camry XV50. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

C1231

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure vehicle is securely lifted and supported if working underneath.

Symptoms

•ABS warning light illuminated on the dashboard
•VSC warning light illuminated
•Possible loss of ABS functionality
•Erratic brake pedal feel
•Increased stopping distance under certain conditions

Diagnostic Steps

1
Scan the vehicle's computer system using an OBD-II scanner to confirm the C1231 code.
2
Check the ABS fuse and relay for continuity and operation.
3
Inspect the wheel speed sensors for damage or disconnection.
4
Measure the resistance of the wheel speed sensors to ensure they are within specifications.
5
Inspect the wiring and connectors associated with the ABS system for corrosion or damage.
6
Clear the error code and conduct a road test to see if the code returns.

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
•Electrical contact cleaner

Parts Required

•Wheel speed sensor(s) (if defective)
•Wiring harness (if damaged)

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Diagnostic Steps

1
Scan the vehicle's computer system using an OBD-II scanner to confirm the C1231 code.
2
Check the ABS fuse and relay for continuity and operation.
3
Inspect the wheel speed sensors for damage or disconnection.
4
Measure the resistance of the wheel speed sensors to ensure they are within specifications.
5
Inspect the wiring and connectors associated with the ABS system for corrosion or damage.
6
Clear the error code and conduct a road test to see if the code returns.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the negative terminal of the battery to prevent electrical shorts.
Ensure vehicle is on a flat surface and secure with wheel chocks.

2. Inspect and Test Wheel Speed Sensors

Locate the wheel speed sensors at each wheel hub.
Tools Required: Multimeter, socket set.
Remove the sensor from the hub using a socket wrench.
Test the sensor with a multimeter for resistance, typically should be between 1,000 to 2,500 ohms.
If the resistance is outside this range, replace the sensor.

3. Check Wiring and Connectors

Visually inspect the wiring harness connected to the wheel speed sensors.
Look for any signs of wear, fraying, or corrosion.
If corrosion is present, clean the connectors with electrical contact cleaner.
Repair or replace any damaged wiring as needed.

4. Replace Faulty Components

If any wheel speed sensors were found defective, install new sensors.
Reconnect all connectors securely and ensure they are properly seated.
Reinstall the sensors back into their respective hubs and torque to manufacturer specifications (typically around 8-12 ft-lbs).

5. Final Checks

Reconnect the negative battery terminal.
Clear any DTCs using the OBD-II scanner.
Start the vehicle and check that the ABS and VSC lights are off.