AutoCodes – Cadillac – B2238 Cadillac

B2238 Cadillac Code - Left 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 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: B2238 Cadillac indicates Left Door Un-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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 504

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B2238 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 B2238 Cadillac - Left Door Un-Lock Switch Fault - AutoCodes.com — B2238 Cadillac Code - Left Door Un-Lock Switch Fault

What does this mean?

What are the Possible Causes of the DTC B2238 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 B2238 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 B2238 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.

Need more information about the B2238 Cadillac code?

Need more information on how to fix the B2238 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2238 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 B2238 Cadillac Code

1. What does the OBDII code B2238 mean on a Cadillac?

B2238 indicates a fault with the left door unlock switch, signaling that the Body Control Module (BCM) has detected an issue in the circuit or switch.

2. What are the common symptoms of code B2238 on a Cadillac?

Symptoms include the left door unlock switch not functioning, inability to unlock the driver-side door electronically, and possible warning lights or error messages on the dashboard.

3. What causes the B2238 code to appear on a Cadillac?

The code can be caused by a faulty left door unlock switch, damaged wiring or connectors in the circuit, or a malfunctioning Body Control Module (BCM).

4. Can I still drive my Cadillac with the B2238 code?

Yes, the vehicle is usually drivable, but you may experience inconvenience due to the left door unlock switch not working properly.

5. How do I diagnose the B2238 code on my Cadillac?

Start by inspecting the left door unlock switch, checking for damaged wiring or connectors, and testing the switch with a multimeter to ensure proper functionality.

6. How do I fix the B2238 code on a Cadillac?

Repairs may include replacing the left door unlock switch, repairing damaged wiring, or, in rare cases, reprogramming or replacing the BCM.

7. Can a blown fuse cause the B2238 code on a Cadillac?

While unlikely, a blown fuse related to the door lock circuit could contribute to the issue and should be checked as part of the diagnostic process.

8. What tools are needed to troubleshoot the B2238 code?

Youâ€™ll need an OBDII scanner, a multimeter to test electrical connections, and potentially wiring diagrams for the door unlock circuit.

9. How much does it cost to repair the B2238 code on a Cadillac?

Repair costs can range from $50 to $300, depending on whether the issue is a simple wiring repair or requires replacing the unlock switch or BCM.

10. Can a software update fix the B2238 code on a Cadillac?

In some cases, a software update for the BCM may resolve the issue, but this is less common than physical repairs like replacing the switch or fixing wiring.