OBD Guide
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B1421

Passenger Power Window Motor Circuit Short To Ground

B1421 is an OBD-II diagnostic trouble code meaning: Passenger Power Window Motor Circuit Short To Ground. Common causes: wiring harness damage, window lift motor malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Front passenger window does not work
  • Power window circuit fuse blows
  • Window regulator works intermittently

Causes

  • Wiring harness damage
  • Window lift motor malfunction
  • Short circuit in control circuit
  • Problems with the control unit

How to Fix

  1. Check the integrity of the wiring harness in the door area
  2. Check the resistance of the window lift motor
  3. Check fuse and relay circuit
  4. Check the operation of the control unit
  5. Replace damaged components

Related codes

B1420B1422B1423

FAQ

What does the B1421 code mean?

B1421 is an OBD-II diagnostic trouble code that indicates: Passenger Power Window Motor Circuit Short To Ground

What causes a B1421 error code?

The most common causes of B1421 include: Wiring harness damage; Window lift motor malfunction; Short circuit in control circuit; Problems with the control unit.

How do I fix a B1421 diagnostic trouble code?

To fix B1421: Check the integrity of the wiring harness in the door area. Check the resistance of the window lift motor. Check fuse and relay circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1421?

Limited driving only, diagnose soon

How much does it cost to fix B1421?

The estimated repair cost for B1421 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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