C1235 Mercury Code - Right Rear Wheel Speed Sensor Input Signal Missing
Quick Answer
The C1235 code for a Mercury vehicle indicates that there is a problem with the right rear wheel speed sensor input signal. Common causes include Faulty right rear wheel speed sensor, Damaged or corroded wiring/connectors leading to the sensor, Issues with the ABS module or ECM. 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
- C1235 Mercury indicates Right Rear Wheel Speed Sensor Input Signal Missing.
- Common causes
- Common causes include Faulty right rear wheel speed sensor, Damaged or corroded wiring/connectors leading to the sensor, Issues with the ABS module or ECM.
- 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 C1235 Mercury Description
The C1235 code for a Mercury vehicle indicates that there is a problem with the right rear wheel speed sensor input signal. The wheel 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 right rear wheel and sending this information to the vehicle's electronic control module (ECM). When the ECM detects that the input signal from the right rear wheel speed sensor is missing or inconsistent, it triggers the C1235 diagnostic trouble code.
Common Causes of C1235 Mercury
- Faulty right rear wheel speed sensor
- Damaged or corroded wiring/connectors leading to the sensor
- Issues with the ABS module or ECM
- Wheel bearing failure affecting sensor operation
- Electronic interference or signal disruption from other vehicle components
Symptoms of C1235 Mercury
- Illumination of the ABS warning light on the dashboard
- Traction control system malfunction or warning light
- Increased stopping distance when braking
- Skidding or loss of traction on slippery surfaces
- Uneven braking or pulling to one side during braking
How to Fix C1235 Mercury
- Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble code and confirm the issue with the right rear wheel speed sensor.
- Inspect the wiring and connectors leading to the sensor for any damage, corrosion, or loose connections. Repair or replace as needed.
- Test the right rear wheel speed sensor using a multimeter to check for proper resistance and signal output. Replace the sensor if it fails the test.
- Clear the trouble code from the ECM's memory using the diagnostic scanner and test drive the vehicle to ensure the issue has been resolved.
- If the problem persists, further diagnosis of the ABS module or ECM may be necessary to identify and address any underlying issues.
Cost to Fix C1235 Mercury
The typical repair costs for addressing a C1235 code related to a right rear wheel speed sensor input signal missing can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $150 and $300 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple shops to ensure a competitive price. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more affordable rates.
Tech Notes for C1235 Mercury
2002-2004 Mercury Mountaineer Factory Service Bulletin OBDII Code C1235
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Frequently Asked Questions about C1235 Mercury Code
1. What does the OBDII code C1235 mean for a Mercury vehicle?
C1235 indicates that the right rear wheel speed sensor is not sending a proper signal to the ABS module, which may affect the vehicle's braking system performance.
2. What are the common symptoms of the C1235 code?
Symptoms include the ABS warning light illuminating, loss of ABS functionality, reduced traction control performance, and possible erratic speedometer readings.
3. What causes the C1235 code to appear?
The most common causes are a faulty right rear wheel speed sensor, damaged wiring or connectors, a dirty or corroded tone ring, or a malfunctioning ABS module.
4. Can I drive my Mercury with the C1235 code?
While the vehicle is still drivable, the ABS and traction control systems may not function properly, which could increase the risk of skidding or loss of control in slippery conditions.
5. How do you diagnose the C1235 code?
Diagnosis involves scanning for stored ABS codes, inspecting the right rear wheel speed sensor and its wiring for damage, and testing the sensor's output with a multimeter or oscilloscope.
6. How can I fix the C1235 code on my Mercury?
Repairs may include replacing the right rear wheel speed sensor, repairing or replacing damaged wiring, cleaning or replacing the tone ring, or addressing issues in the ABS module if necessary.
7. How much does it cost to repair a C1235 code?
The cost for repairs can vary, but replacing a wheel speed sensor typically costs $100-$300, including parts and labor. Additional wiring or ABS module repairs may increase the cost.
8. Can a dirty tone ring cause the C1235 code?
Yes, dirt, debris, or corrosion on the tone ring can interfere with the sensor's ability to read wheel speed, leading to the C1235 code.
9. How can I prevent the C1235 code from recurring?
Regularly inspect and clean the wheel speed sensors and tone rings, ensure wiring is secure and undamaged, and address ABS warning lights promptly.
10. Will clearing the code fix the issue?
Clearing the code without addressing the root cause will not fix the issue, and the code will likely return once the vehicle is driven.
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