OBD Guide
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C1940

Front Yaw Rate Sensor

C1940 is an OBD-II diagnostic trouble code meaning: Front Yaw Rate Sensor. Common causes: malfunction of the angular rate sensor, open or shorted wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • ESP/ABS indicator is on
  • Disabling stability control
  • Incorrect operation of airbags
  • Errors in related systems

Causes

  • Malfunction of the angular rate sensor
  • Open or shorted wiring harness
  • Poor contact in connectors
  • Mechanical damage to the sensor
  • Sensor power problems

How to Fix

  1. Diagnostics with a scanner to confirm the code
  2. Visual inspection of the sensor and wiring
  3. Checking the resistance and voltage on the sensor
  4. Cleaning the connector contacts
  5. Replace the sensor if necessary
  6. Calibrating a new sensor

Related codes

C1941C1942C1943C1944

FAQ

What does the C1940 code mean?

C1940 is an OBD-II diagnostic trouble code that indicates: Front Yaw Rate Sensor

What causes a C1940 error code?

The most common causes of C1940 include: Malfunction of the angular rate sensor; Open or shorted wiring harness; Poor contact in connectors; Mechanical damage to the sensor.

How do I fix a C1940 diagnostic trouble code?

To fix C1940: Diagnostics with a scanner to confirm the code. Visual inspection of the sensor and wiring. Checking the resistance and voltage on the sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1940?

Limited driving only, diagnose soon

How much does it cost to fix C1940?

The estimated repair cost for C1940 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat