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OBD Code C1237

Speed Wheel Rear Input Signal Missing

CodeC1237
DescriptionSpeed Wheel Rear Input Signal Missing
SystemChassis

What Does C1237 Mean?

Speed Wheel Rear Input Signal Missing. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the chassis.

Code Breakdown

C = Chassis code

1 = Manufacturer-specific

How to Fix C1237

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Identify which chassis system the code relates to (ABS, suspension, steering, stability).
  2. Inspect the associated sensor connectors and wiring.
  3. Check for related ABS or stability control codes.
  4. Verify wheel speed sensor signals are accurate.
  5. Check the chassis control module connectors for corrosion.
  6. Clear codes and test drive, monitoring chassis system operation.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is C1237 serious?

Yes — C1237 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear C1237 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix C1237?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

View All OBD Codes