AutoCodes – Generic – B2120

B2120 Code - Door Passenger Set Switch Stuck Failure

Quick Answer

The Body Control Module (BCM) monitors the Door Passenger Set Switch. Common causes include Faulty Door Passenger Set Switch, Door Passenger Set Switch harness is open or shorted, Door Passenger Set Switch 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: B2120 indicates Door Passenger Set Switch Stuck Failure.
Common causes: Common causes include Faulty Door Passenger Set Switch, Door Passenger Set Switch harness is open or shorted, Door Passenger Set Switch 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 10,004

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 Sep 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2120 Description

The Body Control Module (BCM) monitors the Door Passenger Set Switch. The BCM sets the OBDII code when the Door Passenger Set Switch is not to factory specifications.

OBDII Code B2120 - Door Passenger Set Switch Stuck Failure - AutoCodes.com — B2120 Code - Door Passenger Set Switch Stuck Failure

What does this mean?

What are the Possible Causes of the DTC B2120?

Faulty Door Passenger Set Switch
Door Passenger Set Switch harness is open or shorted
Door Passenger Set Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2120?

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 B2120 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 B2120 code?

Need more information on how to fix the B2120 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2120 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2120 Buick — Power Seat Position Sensor Voltage
B2120 Cadillac — Power Seat Position Sensor Voltage
B2120 Chevrolet — Power Seat Position Sensor Voltage
B2120 Chrysler — Ignition Run/Acc/Pad Control Circuit Open
B2120 Dodge — Ignition Run/Acc/Pad Control Circuit Open
B2120 GMC — Power Seat Position Sensor Voltage
B2120 Jeep — Ignition Run/Acc/Pad Control Circuit Open
B2120 RAM — Ignition Run/Acc/Pad Control Circuit Open

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 B2120 Code

1. What are the common symptoms of OBDII code B2120 (Door Passenger Set Switch Stuck Failure)?

- Common symptoms include the passenger door not locking or unlocking properly, interior lights staying on, and warning lights on the dashboard.

2. What are the possible causes of OBDII code B2120?

- The code B2120 can be triggered by a faulty passenger door set switch, damaged wiring in the door, or a malfunctioning control module.

3. How can I diagnose the issue related to OBDII code B2120?

- To diagnose the issue, you can use a diagnostic scanner to read the code, visually inspect the passenger door set switch and wiring, and perform a continuity test to check for any open circuits.

4. Can I repair OBDII code B2120 on my own?

- Depending on the cause, you may be able to repair the issue on your own by replacing the faulty passenger door set switch, repairing damaged wiring, or resetting the control module.

5. Is it safe to continue driving with OBDII code B2120 active?

- It is generally not recommended to continue driving with OBDII code B2120 active, as it can affect the proper functioning of the passenger door and compromise vehicle security.

6. How much does it typically cost to repair OBDII code B2120?

- The cost of repairing OBDII code B2120 can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Can OBDII code B2120 be intermittent?

- Yes, OBDII code B2120 can be intermittent, especially if the issue is related to loose wiring or a sporadically malfunctioning door set switch.

8. Will resetting the OBDII code B2120 resolve the issue?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing OBDII code B2120 to appear.

9. How long does it take to repair OBDII code B2120?

- The repair time for OBDII code B2120 can vary depending on the complexity of the issue, but it may take anywhere from 1 to 3 hours at a repair shop.

10. Can OBDII code B2120 affect other vehicle systems?

- While OBDII code B2120 is specific to the passenger door set switch, it can indirectly affect other vehicle systems like the central locking system and interior lighting if left unresolved.