C1402 Code - Front Speed Sensor Left Malfunction
Quick Answer
The C1402 diagnostic trouble code indicates a malfunction in the front speed sensor on the left side of the vehicle. Common causes include Damaged or worn front speed sensor, Loose or corroded electrical connections, Wiring harness issues. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1402 indicates Front Speed Sensor Left Malfunction.
- Common causes
- Common causes include Damaged or worn front speed sensor, Loose or corroded electrical connections, Wiring harness issues.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code C1402 Description
The C1402 diagnostic trouble code indicates a malfunction in the front speed sensor on the left side of the vehicle. The speed sensor is a crucial component of the vehicle's anti-lock braking system (ABS) and traction control system. It is responsible for monitoring the speed of the wheels and sending this information to the ABS control module. If the front speed sensor on the left side is malfunctioning, it can lead to issues with the ABS and traction control systems, potentially compromising the vehicle's ability to brake effectively and maintain traction on the road.
Common Causes of C1402
- Damaged or worn front speed sensor.
- Loose or corroded electrical connections.
- Wiring harness issues.
- Faulty ABS control module.
- Wheel bearing or hub assembly problems.
Symptoms of C1402
- ABS warning light illuminated on the dashboard.
- Traction control light activated.
- Inaccurate speedometer readings.
- Difficulty braking, especially in slippery conditions.
- Increased stopping distance.
How to Fix C1402
- Consult the vehicle's service manual for the exact location of the front speed sensor.
- Inspect the sensor for any visible damage or signs of wear.
- Test the sensor's electrical connections and wiring for faults.
- Replace the front speed sensor if necessary.
- Clear the diagnostic trouble code and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix C1402
The cost of repairing a front speed sensor left malfunction can vary depending on the make and model of the vehicle, as well as the specific underlying issue. On average, the cost of replacing a front speed sensor can range from $100 to $300, including parts and labor. However, additional costs may be incurred if there are other related components that need to be repaired or replaced. It is recommended to get a detailed quote from a reputable auto repair shop to determine the exact cost of addressing this issue.
Tech Notes for C1402
If there is iron powder sticking to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign material before replacing the sensor.
Check the speed sensor signal after cleaning or replacement.
On most vehicles, the Front Speed Sensor Rotor is incorporated into the Front Axle Hub Sub-Assembly. If the Speed Sensor Rotor needs to be replaced, replace it together with the Front Axle Hub Sub-Assembly.
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Code C1402 Information for Specific Makes
- C1402 Chrysler — Transfer Case Range Select Switch Circuit High
- C1402 Dodge — Transfer Case Range Select Switch Circuit High
- C1402 Jeep — Transfer Case Range Select Switch Circuit High
- C1402 Lexus — Front Speed Sensor Left Malfunction
- C1402 Scion — Front Speed Sensor Left Malfunction
- C1402 Toyota — Front Speed Sensor Left Malfunction
Frequently Asked Questions about C1402 Code
1. What does OBDII code C1402 mean?
C1402 indicates a malfunction in the front left wheel speed sensor, which is part of the anti-lock braking system (ABS).
2. What are the symptoms of C1402?
Common symptoms include an illuminated ABS warning light, reduced braking performance, and possible loss of ABS functionality.
3. What causes the C1402 code?
The code is typically caused by a faulty front left wheel speed sensor, damaged wiring, corroded connectors, or debris affecting the sensor.
4. Can I drive with the C1402 code?
While the vehicle may still be drivable, the ABS system may not function properly, increasing the risk of skidding during hard braking or on slippery surfaces.
5. How do I diagnose the C1402 code?
Inspect the front left wheel speed sensor for damage, check the wiring and connectors for corrosion or wear, and test the sensor’s signal using a multimeter.
6. How do you fix the C1402 code?
Repairs may involve replacing the front left wheel speed sensor, repairing or replacing damaged wiring, or cleaning debris from the sensor area.
7. How much does it cost to fix the C1402 code?
Repair costs can range from $100 to $300, depending on whether the sensor needs replacement and the labor rates in your area.
8. Can a dirty wheel speed sensor trigger the C1402 code?
Yes, dirt, debris, or rust around the front left wheel speed sensor can interfere with its function and cause the code.
9. Does the C1402 code affect other systems?
Yes, since the ABS is linked to traction control and stability control, those systems may also be disabled or impaired.
10. How can I prevent the C1402 code from reoccurring?
Regularly inspect and clean the wheel speed sensors, ensure wiring is secured and undamaged, and avoid driving in areas with excessive debris buildup.
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