AutoCodes – GMC – B2239 GMC

B2239 GMC Code - Right Door Un-Lock Switch Fault

Quick Answer

The driver or passenger door switch signal circuits provide inputs to the Driver Door Module (DDM) or Passenger Door Module (PDM) when a door lock switch is activated to the LOCK or UNLOCK position. Common causes include Faulty Right Door Lock Switch, Right Door Lock Switch harness is open or shorted, Right Door Lock 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: B2239 GMC indicates Right Door Un-Lock Switch Fault.
Common causes: Common causes include Faulty Right Door Lock Switch, Right Door Lock Switch harness is open or shorted, Right Door Lock 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 600

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 Oct 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2239 GMC Description

The driver or passenger door switch signal circuits provide inputs to the Driver Door Module (DDM) or Passenger Door Module (PDM) when a door lock switch is activated to the LOCK or UNLOCK position. These inputs allow the door module to detect a door LOCK or UNLOCK request. The door modules provide power and ground to the door lock switches. When a door lock switch is activated to the LOCK or UNLOCK position, ground is supplied through the door lock switch to the signal circuit, which is pulled low. When the door module detects low voltage on the signal circuit, it will command the door latches to LOCK or UNLOCK. If the driver door switch is activated, the DDM will LOCK or UNLOCK the driver door latch and also send a message on the serial data line to the PDM to LOCK or UNLOCK the passenger door latch. If the passenger door switch is activated, the PDM will LOCK or UNLOCK the passenger door latch and also send a message on the serial data line to the DDM to LOCK or UNLOCK the driver door latch. The door modules monitor the signal circuits to determine how long the ground has been applied. If the door module detects that a ground is applied for greater than 20 seconds, a Diagnostic Trouble Code (DTC) is set.

OBDII Code B2239 GMC - Right Door Un-Lock Switch Fault - AutoCodes.com — B2239 GMC Code - Right Door Un-Lock Switch Fault

What does this mean?

What are the Possible Causes of the DTC B2239 GMC?

Faulty Right Door Lock Switch
Right Door Lock Switch harness is open or shorted
Right Door Lock Switch circuit poor electrical connection
Faulty Passenger Door Module (PDM)

How to Fix the DTC B2239 GMC?

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 B2239 GMC 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.

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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 B2239 GMC Code

1. What are the common symptoms of OBDII code B2239 GMC, Right Door Un-Lock Switch Fault?

The common symptoms include the right door not unlocking properly when using the switch, or the door lock/unlock switch not functioning at all.

2. What are the possible causes of OBDII code B2239 GMC?

The code B2239 GMC typically indicates a fault with the right door unlock switch, such as a defective switch or a wiring issue.

3. How can I diagnose the Right Door Un-Lock Switch Fault (B2239) in my GMC vehicle?

To diagnose the issue, you can start by checking the wiring and connections to the right door unlock switch, testing the switch for proper functionality, and scanning the vehicle for any additional related trouble codes.

4. Can I still manually unlock the right door if OBDII code B2239 GMC is triggered?

Yes, even if the code B2239 GMC is present, you can typically still unlock the right door manually using the key or from the inside handle.

5. How can I repair the Right Door Un-Lock Switch Fault (B2239) in my GMC vehicle?

Repairing the fault may involve replacing the right door unlock switch if it is faulty, repairing any damaged wiring, or addressing any underlying electrical issues causing the fault code.

6. Is it safe to continue driving with OBDII code B2239 GMC active?

While the vehicle may still be operational with the code present, it is recommended to address the issue promptly to ensure proper functioning of the right door lock system.

7. Will OBDII code B2239 GMC cause any other problems in my GMC vehicle?

The code B2239 GMC specifically relates to the right door unlock switch fault and should not directly cause other issues, but addressing the problem in a timely manner is important.

8. Can a DIY enthusiast fix OBDII code B2239 GMC, Right Door Un-Lock Switch Fault?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address the issue by following repair guides and utilizing the necessary replacement parts.

9. How much does it typically cost to repair OBDII code B2239 GMC in a GMC vehicle?

The cost of repairing the Right Door Un-Lock Switch Fault (B2239) can vary based on the specific cause of the issue, labor costs, and the price of replacement parts.

10. Is the Right Door Un-Lock Switch Fault (B2239) a common issue in GMC vehicles?

While not extremely common, issues with door lock switches can occur in vehicles over time, leading to the triggering of OBDII code B2239 GMC in some GMC models.