AutoCodes – Cadillac – B2236 Cadillac

B2236 Cadillac 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 Cadillac 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 590

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

What does this mean?

What are the Possible Causes of the DTC B2236 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code B2236 in a Cadillac related to the left door lock switch?

The common symptoms include the inability to lock or unlock the left door using the switch, erratic behavior of the door lock mechanism, or a complete non-response from the left door lock switch.

2. What are the potential causes of OBDII code B2236 in a Cadillac indicating a Left Door Lock Switch Fault?

The code B2236 in a Cadillac is typically triggered by a faulty left door lock switch, damaged wiring or connectors in the left door lock circuit, or a malfunctioning body control module (BCM).

3. How can I diagnose the Left Door Lock Switch Fault causing OBDII code B2236 in my Cadillac?

Start by checking the left door lock switch for physical damage or signs of wear. Then, inspect the wiring and connectors in the left door lock circuit for any issues. If necessary, use a scan tool to check for BCM-related faults.

4. Can I repair the Left Door Lock Switch Fault related to OBDII code B2236 in my Cadillac myself?

Depending on your skill level and access to tools, you may be able to replace the left door lock switch or repair faulty wiring yourself. However, diagnosing and repairing issues related to the BCM may require professional assistance.

5. Is it safe to continue driving my Cadillac with OBDII code B2236 indicating a Left Door Lock Switch Fault?

While the vehicle may still be operable with the code present, it is recommended to address the issue promptly. A malfunctioning left door lock switch can compromise the security of your vehicle and may lead to further electrical problems if left unresolved.

6. Will resetting the OBDII code B2236 in my Cadillac make the Left Door Lock Switch Fault disappear?

Resetting the code may temporarily clear the fault from the system, but it will likely reappear if the underlying issue with the left door lock switch or related components is not resolved.

7. How much does it typically cost to repair the Left Door Lock Switch Fault causing OBDII code B2236 in a Cadillac?

The cost of repair can vary depending on the specific issue causing the fault. Replacing the left door lock switch or repairing wiring may cost a few hundred dollars, while addressing BCM-related issues can be more expensive.

8. Can extreme weather conditions affect the occurrence of OBDII code B2236 in a Cadillac related to the Left Door Lock Switch Fault?

Extreme temperatures or moisture can potentially exacerbate issues with the left door lock switch or electrical connections, leading to the triggering of code B2236. It's important to keep the door components well-maintained in such conditions.

9. Are there any preventive measures I can take to avoid encountering OBDII code B2236 due to a Left Door Lock Switch Fault in my Cadillac?

Regularly inspecting and maintaining the door lock switches, wiring, and connectors can help prevent issues that may trigger the code B2236. Keeping the components clean and lubricated can also prolong their lifespan.

10. Can a Left Door Lock Switch Fault related to OBDII code B2236 in a Cadillac affect the functionality of other vehicle systems?

While the fault primarily relates to the left door lock switch, electrical issues in this area can sometimes impact other systems controlled by the BCM. It's essential to address the fault promptly to avoid potential cascading electrical problems.