AutoCodes – GMC – B2236 GMC

B2236 GMC Code - Left Door 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 Left Door lock Switch, Left Door lock Switch harness is open or shorted, Left 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: B2236 GMC indicates Left Door Lock Switch Fault.
Common causes: Common causes include Faulty Left Door lock Switch, Left Door lock Switch harness is open or shorted, Left 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 630

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 B2236 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 B2236 GMC - Left Door Lock Switch Fault - AutoCodes.com — B2236 GMC Code - Left Door Lock Switch Fault

What does this mean?

What are the Possible Causes of the DTC B2236 GMC?

Faulty Left Door lock Switch
Left Door lock Switch harness is open or shorted
Left Door lock Switch circuit poor electrical connection
Faulty Driver Door Module (DDM)

How to Fix the DTC B2236 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 B2236 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 B2236 GMC Code

1. What are the common symptoms of OBDII code B2236 GMC (Left Door Lock Switch Fault)?

The common symptoms of this code include malfunctioning left door lock switch, inability to lock or unlock the door, and intermittent issues with the door lock mechanism.

2. What are the possible causes of OBDII code B2236 GMC (Left Door Lock Switch Fault)?

Possible causes of this code may include a faulty left door lock switch, damaged wiring or connectors in the door lock circuit, or issues with the door lock actuator.

3. How can I diagnose OBDII code B2236 GMC (Left Door Lock Switch Fault)?

Diagnosing this code involves inspecting the left door lock switch for proper operation, checking the wiring and connectors for any damage, and testing the door lock actuator for functionality.

4. Can I repair OBDII code B2236 GMC (Left Door Lock Switch Fault) myself?

If you have experience with automotive electrical systems, you may be able to repair this issue yourself by replacing the faulty left door lock switch, repairing damaged wiring, or fixing the door lock actuator.

5. Is it safe to continue driving with OBDII code B2236 GMC (Left Door Lock Switch Fault) present?

While it may be safe to drive with this code, it is recommended to address the issue promptly to ensure the proper functioning of the left door lock mechanism for security and convenience.

6. How much does it typically cost to repair OBDII code B2236 GMC (Left Door Lock Switch Fault) at a repair shop?

The cost of repairing this code at a repair shop can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Can resetting the OBDII system clear OBDII code B2236 GMC (Left Door Lock Switch Fault)?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the left door lock switch persists, the code is likely to reappear.

8. Are there any preventive measures to avoid OBDII code B2236 GMC (Left Door Lock Switch Fault)?

To prevent this code from appearing, it is recommended to regularly check the functionality of the door lock switches and address any issues promptly to avoid further damage to the door lock system.

9. What other OBDII codes may be associated with OBDII code B2236 GMC (Left Door Lock Switch Fault)?

Other related OBDII codes that may be associated with this issue include codes related to door lock actuator problems or general electrical circuit faults in the vehicle's door locking system.

10. Can a faulty left door lock switch cause other issues in the vehicle apart from OBDII code B2236 GMC (Left Door Lock Switch Fault)?

Yes, a faulty left door lock switch can potentially cause other issues such as difficulty in locking or unlocking the door, potential security risks, and overall inconvenience when trying to secure the vehicle.