AutoCodes – Generic – B1421

B1421 Code - Passenger Power Window Motor Circuit Short To Ground

Quick Answer

The Body Control Module (BCM) monitors the Passenger Power Window Motor. Common causes include Faulty Passenger Power Window Motor, Passenger Power Window Motor harness is open or shorted, Passenger Power Window Motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1421 indicates Passenger Power Window Motor Circuit Short To Ground.
Common causes: Common causes include Faulty Passenger Power Window Motor, Passenger Power Window Motor harness is open or shorted, Passenger Power Window Motor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 21,965

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1421 Description

The Body Control Module (BCM) monitors the Passenger Power Window Motor. The BCM sets the OBDII code when the Passenger Power Window Motor is not to factory specifications.

OBDII Code B1421 - Passenger Power Window Motor Circuit Short To Ground - AutoCodes.com — B1421 Code - Passenger Power Window Motor Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B1421?

Faulty Passenger Power Window Motor
Passenger Power Window Motor harness is open or shorted
Passenger Power Window Motor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1421?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1421 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1421 code?

Need more information on how to fix the B1421 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1421 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1421 Lexus — Solar Sensor Circuit Passenger Side
B1421 Scion — Solar Sensor Circuit Passenger Side
B1421 Toyota — Solar Sensor Circuit Passenger Side

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1421 Code

1. What are the common symptoms of OBDII code B1421 (Passenger Power Window Motor Circuit Short To Ground)?

- Common symptoms include the passenger power window not working, the window moving erratically, or the window getting stuck in one position.

2. What are the possible causes of OBDII code B1421?

- The code B1421 can be triggered by a short to ground in the wiring harness, a faulty power window motor, or a problem with the power window switch.

3. How can I diagnose the cause of OBDII code B1421?

- To diagnose the code B1421, you can start by checking the power window fuse, inspecting the wiring harness for any visible damage, and testing the power window motor and switch for proper functionality.

4. Can I still drive my vehicle with OBDII code B1421 present?

- It is generally safe to drive your vehicle with the B1421 code, but it is recommended to address the issue promptly to avoid further damage to the power window system.

5. Is it possible to reset OBDII code B1421 without fixing the issue?

- Resetting the code without fixing the underlying issue will not solve the problem. The code will likely reappear until the root cause is properly diagnosed and repaired.

6. How much does it typically cost to repair OBDII code B1421?

- The cost of repairing the B1421 code can vary depending on the cause of the issue, but it may involve replacing the power window motor, repairing the wiring harness, or replacing the power window switch.

7. Can I repair OBDII code B1421 myself, or do I need a professional mechanic?

- If you have experience working on automotive electrical systems, you may be able to diagnose and repair the B1421 code yourself. Otherwise, it is recommended to seek the assistance of a professional mechanic.

8. Are there any preventive measures to avoid OBDII code B1421 in the future?

- To prevent the B1421 code from reoccurring, you can perform regular inspections of the power window system, avoid overloading the window motor, and ensure proper installation of any aftermarket accessories.

9. Will fixing OBDII code B1421 improve my vehicle's overall performance?

- While fixing the B1421 code may not directly impact your vehicle's performance, it will restore the functionality of the passenger power window and improve overall convenience and safety.

10. What should I do if I encounter OBDII code B1421 intermittently?

- If the B1421 code appears intermittently, it is still important to address the issue as soon as possible to prevent potential damage to the power window system.