AutoCodes – Chevrolet – B2238 Chevrolet

B2238 Chevrolet 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 Chevrolet 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.

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Code Popularity 525

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

What does this mean?

What are the Possible Causes of the DTC B2238 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 B2238 Chevrolet Code

1. What does the OBDII code B2238 mean for a Chevrolet vehicle?

The code B2238 indicates a fault with the Left Door Un-Lock Switch, which means there is an issue with the switch or its circuit preventing proper operation.

2. What are the common symptoms of code B2238 in a Chevrolet?

Symptoms may include the left door not unlocking with the switch, inconsistent operation of the door lock system, or no response from the left door unlock button.

3. What causes the B2238 code in a Chevrolet?

Common causes include a faulty left door unlock switch, damaged wiring or connectors, a malfunctioning door lock actuator, or a problem within the body control module (BCM).

4. How do I diagnose a B2238 code in my Chevrolet?

Start by visually inspecting the left door unlock switch, wiring, and connectors for damage. Use a multimeter to test the switch and wiring continuity, and check for any related BCM issues.

5. Can I drive my Chevrolet with a B2238 code?

Yes, you can still drive the vehicle, but the left door unlock function may not work properly, which could be inconvenient or pose a security concern.

6. How can I fix the B2238 code in a Chevrolet?

Repairs may include replacing the faulty unlock switch, repairing damaged wiring or connectors, or reprogramming or replacing the BCM if necessary.

7. How much does it cost to fix a B2238 code in a Chevrolet?

The cost varies depending on the cause but could range from $50 for a simple switch replacement to $500 or more if the BCM needs replacement or reprogramming.

8. Can a dead battery cause the B2238 code in a Chevrolet?

A dead or weak battery is unlikely to directly cause this code, but power issues can sometimes contribute to electronic malfunctions in the vehicle.

9. Will clearing the B2238 code fix the problem?

Clearing the code may temporarily remove the error from the system, but the underlying problem must be fixed to prevent the code from returning.

10. Does the B2238 code affect other doors or systems in my Chevrolet?

Generally, this code is specific to the left door unlock switch, but related wiring or BCM issues could potentially affect other door locks or systems.