AutoCodes – Generic – C1237

C1237 Code - Speed Wheel Rear Input Signal Missing

Quick Answer

The Anti-Lock Brake System (ABS) Actuator And Electric Unit (Control Unit) monitors the Rear Anti-Lock Brake Sensor. Common causes include Faulty Rear ABS Sensor, Rear ABS Sensor harness is open or shorted, Rear ABS Sensor circuit poor electrical connection. 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 indicates Speed Wheel Rear Input Signal Missing.
Common causes: Common causes include Faulty Rear ABS Sensor, Rear ABS Sensor harness is open or shorted, Rear ABS Sensor circuit poor electrical connection.
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 Popularity 62,994

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1237 Description

The Anti-Lock Brake System (ABS) Actuator And Electric Unit (Control Unit) monitors the Rear Anti-Lock Brake Sensor. The ABS Actuator And Electric Unit sets the OBDII code when the Rear Anti-Lock Brake Sensor is not to factory specifications.

OBDII Code C1237 - Speed Wheel Rear Input Signal Missing - AutoCodes.com — C1237 Code - Speed Wheel Rear Input Signal Missing

What does this mean?

What are the Possible Causes of the DTC C1237?

Faulty Rear ABS Sensor
Rear ABS Sensor harness is open or shorted
Rear ABS Sensor circuit poor electrical connection
Faulty Wheel Speed Sensor
Wheel bearing

How to Fix the DTC C1237?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1237 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C1237 code?

Need more information on how to fix the C1237 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1237 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1237 Ford — Speed Wheel Rear Input Signal Missing
C1237 Lexus — Speed Sensor Rotor Faulty
C1237 Lincoln — Speed Wheel Rear Input Signal Missing
C1237 Mercury — Speed Wheel Rear Input Signal Missing
C1237 Scion — Speed Sensor Rotor Faulty
C1237 Toyota — Speed Sensor Rotor Faulty

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 Code

1. What are the common symptoms of OBDII code C1237 (Speed Wheel Rear Input Signal Missing)?

The common symptoms include the ABS warning light illuminating on the dashboard, traction control system malfunctions, and potential loss of stability control.

2. What are the possible causes of OBDII code C1237?

Possible causes of this code include a faulty rear wheel speed sensor, damaged wiring or connectors in the rear wheel speed sensor circuit, a malfunctioning ABS module, or issues with the vehicle's electronic stability control system.

3. How can I diagnose the source of OBDII code C1237?

Diagnosing this code typically involves using a diagnostic scan tool to retrieve the specific trouble code, inspecting the rear wheel speed sensor and its wiring for damage or corrosion, and testing the sensor's output using a multimeter.

4. Can I still drive my vehicle with OBDII code C1237 present?

While it may be possible to drive the vehicle with this code, it is not recommended as it can affect the proper functioning of the ABS and stability control systems, potentially compromising safety.

5. How can I repair OBDII code C1237?

Repairing this code often involves replacing the faulty rear wheel speed sensor, repairing any damaged wiring or connectors, resetting the trouble code with a scan tool, and testing the system to ensure proper functionality.

6. Are there any DIY tips for fixing OBDII code C1237?

DIY tips for addressing this code include checking and cleaning the rear wheel speed sensor connections, inspecting the sensor for any visible damage, and ensuring all related components are securely connected.

7. How urgent is it to address OBDII code C1237?

It is recommended to address this code as soon as possible to prevent potential safety hazards and further damage to the vehicle's ABS and stability control systems.

8. Can weather conditions affect the occurrence of OBDII code C1237?

Yes, extreme weather conditions like heavy rain or snow can sometimes lead to issues with the rear wheel speed sensor, triggering OBDII code C1237.

9. Is it common for multiple wheel speed sensors to fail simultaneously and trigger code C1237?

While rare, it is possible for multiple wheel speed sensors to fail simultaneously due to shared wiring or electrical issues, resulting in the occurrence of OBDII code C1237.

10. Will disconnecting the battery reset OBDII code C1237?

Disconnecting the battery may temporarily clear the trouble code, but it is recommended to address the underlying issue causing the code to prevent it from reoccurring.