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C1237 Lincoln Code - Speed Wheel Rear Input Signal Missing

Quick Answer

The C1237 diagnostic trouble code (DTC) for Lincoln vehicles specifically indicates that there is a missing input signal from the rear wheel speed sensor. Common causes include Faulty rear wheel speed sensor, Damaged or corroded wiring/connectors leading to the sensor, Absence of signal due to sensor misalignment or physical damage. 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
C1237 Lincoln indicates Speed Wheel Rear Input Signal Missing.
Common causes
Common causes include Faulty rear wheel speed sensor, Damaged or corroded wiring/connectors leading to the sensor, Absence of signal due to sensor misalignment or physical damage.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code C1237 Lincoln Description

The C1237 diagnostic trouble code (DTC) for Lincoln vehicles specifically indicates that there is a missing input signal from the rear wheel speed sensor. This sensor plays a crucial role in the vehicle's anti-lock braking system (ABS) and traction control system. When the ABS or traction control system detects a difference in wheel speed between the rear wheels, it uses this information to adjust braking pressure and prevent wheel lock-up during hard braking or loss of traction.

OBDII Code C1237 Lincoln - Speed Wheel Rear Input Signal Missing
C1237 Lincoln Code - Speed Wheel Rear Input Signal Missing

Common Causes of C1237 Lincoln

  1. Faulty rear wheel speed sensor
  2. Damaged or corroded wiring/connectors leading to the sensor
  3. Absence of signal due to sensor misalignment or physical damage
  4. Electronic control module (ECM) failure affecting sensor input
  5. Wheel speed sensor ring damage or contamination

Symptoms of C1237 Lincoln

  1. ABS warning light illuminated on the dashboard
  2. Traction control warning light activated
  3. Increased stopping distances during braking
  4. Loss of traction or stability while driving
  5. Erratic or inconsistent ABS system activation

How to Fix C1237 Lincoln

  1. Begin by diagnosing the specific cause of the missing rear wheel speed sensor signal using a diagnostic scanner to retrieve additional fault codes and sensor data.
  2. Inspect the rear wheel speed sensor, wiring, and connectors for any visible damage, corrosion, or loose connections. Replace or repair any damaged components as needed.
  3. Check the wheel speed sensor ring for damage or contamination that may be interfering with sensor operation. Clean or replace the sensor ring if necessary.
  4. Test the rear wheel speed sensor's output signal using a multimeter to ensure it is within the manufacturer's specified range. Replace the sensor if it fails to provide a consistent signal.
  5. Clear the DTC from the vehicle's ECM memory using the diagnostic scanner and perform a test drive to verify that the ABS and traction control systems are functioning correctly.

Cost to Fix C1237 Lincoln

The typical repair costs for addressing a missing rear wheel speed sensor input signal on a Lincoln vehicle can range from $150 to $300, depending on the specific cause of the issue and the cost of replacement parts. This estimate includes the price of a new rear wheel speed sensor, any necessary wiring or connector repairs, and labor costs. Keep in mind that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources to ensure a competitive price.

What does this mean?

Tech Notes for C1237 Lincoln

There is a Factory Service Bulletin for the 2003-2004 Lincoln Aviator:

2003-2004 Lincoln Aviator Factory Service Bulletin OBDII Code C1237

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1237 Lincoln Code

1. What does the OBDII code C1237 mean on a Lincoln?

The code C1237 indicates that the rear wheel speed sensor input signal is missing or not being detected by the ABS module.

2. What are common symptoms of a C1237 code on a Lincoln?

Common symptoms include the ABS warning light being illuminated, loss of ABS functionality, and potentially reduced traction control performance.

3. What causes the C1237 code to appear?

The most common causes are a faulty rear wheel speed sensor, damaged sensor wiring, a dirty or damaged tone ring, or a malfunctioning ABS module.

4. How can I diagnose a C1237 code on my Lincoln?

Start by inspecting the rear wheel speed sensor and its wiring for damage or disconnection. Use a scan tool to monitor live wheel speed data and confirm if the sensor is sending a signal.

5. Can I drive my Lincoln with the C1237 code active?

Yes, but be cautious. While the vehicle will still operate, the ABS and traction control systems may not function, increasing the risk of skidding or loss of control in slippery conditions.

6. How do I fix the C1237 code on my Lincoln?

Repairs may include replacing the rear wheel speed sensor, repairing damaged wiring, cleaning or replacing the tone ring, or addressing ABS module issues.

7. How much does it cost to repair a C1237 code?

Replacing a rear wheel speed sensor typically costs $100–$300, including parts and labor. Costs may vary based on additional repairs needed.

8. Can a dirty tone ring cause the C1237 code?

Yes, a dirty or damaged tone ring can prevent the sensor from reading wheel speed accurately, triggering the C1237 code.

9. Does a C1237 code require ABS module replacement?

Not always. ABS module replacement is only necessary if the module itself is determined to be faulty after sensor and wiring issues are ruled out.

10. Can I reset the C1237 code without fixing the problem?

You can clear the code with a scan tool, but it will likely return unless the underlying issue is resolved.

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