OBD Guide
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C1420

Acceleration Sensor Malfunction

C1420 is an OBD-II diagnostic trouble code meaning: Acceleration Sensor Malfunction. Common causes: acceleration sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag light is on
  • SRS does not activate upon impact
  • Error persists after scanning

Causes

  • Acceleration sensor malfunction
  • Open or short circuit in wiring harness
  • Poor contact in the sensor connector
  • SRS control unit malfunction

How to Fix

  1. Check the integrity of the wiring harness and connectors
  2. Check the resistance of the acceleration sensor
  3. Replace acceleration sensor if necessary
  4. Check SRS control unit
  5. Reset the error and check the system

Related codes

B0001B0002B0100

FAQ

What does the C1420 code mean?

C1420 is an OBD-II diagnostic trouble code that indicates: Acceleration Sensor Malfunction

What causes a C1420 error code?

The most common causes of C1420 include: Acceleration sensor malfunction; Open or short circuit in wiring harness; Poor contact in the sensor connector; SRS control unit malfunction.

How do I fix a C1420 diagnostic trouble code?

To fix C1420: Check the integrity of the wiring harness and connectors. Check the resistance of the acceleration sensor. Replace acceleration sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1420?

Limited driving only, diagnose soon

How much does it cost to fix C1420?

The estimated repair cost for C1420 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat