OBD Guide
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C1237

Speed Wheel Rear Input Signal Missing

C1237 is an OBD-II diagnostic trouble code meaning: Speed Wheel Rear Input Signal Missing. Common causes: rear wheel speed sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • ABS/ESP indicator is on
  • Disabling the ABS/ESP system
  • Incorrect operation of cruise control (if equipped)

Causes

  • Rear wheel speed sensor malfunction
  • Open or short circuit in wiring harness
  • Impulse rotor is dirty or damaged
  • Poor contact in the sensor connector
  • ABS/ESP module malfunction

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Clean the contacts of the sensor connector
  3. Check the resistance of the wheel speed sensor
  4. Inspect the impulse rotor for damage
  5. If necessary, replace the wheel speed sensor

Related codes

C1234C1235C1236

FAQ

What does the C1237 code mean?

C1237 is an OBD-II diagnostic trouble code that indicates: Speed Wheel Rear Input Signal Missing

What causes a C1237 error code?

The most common causes of C1237 include: Rear wheel speed sensor malfunction; Open or short circuit in wiring harness; Impulse rotor is dirty or damaged; Poor contact in the sensor connector.

How do I fix a C1237 diagnostic trouble code?

To fix C1237: Check the integrity of the sensor wiring harness. Clean the contacts of the sensor connector. Check the resistance of the wheel speed sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1237?

Limited driving only, diagnose soon

How much does it cost to fix C1237?

The estimated repair cost for C1237 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat