AutoCodes – Generic – B1438

B1438 Code - Wiper Mode Select Switch Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Wiper Mode Select Switch. Common causes include Faulty Wiper Mode Select Switch, Wiper Mode Select Switch harness is open or shorted, Wiper Mode Select 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: B1438 indicates Wiper Mode Select Switch Circuit Failure.
Common causes: Common causes include Faulty Wiper Mode Select Switch, Wiper Mode Select Switch harness is open or shorted, Wiper Mode Select 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 15,457

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 Apr 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1438 Description

The Body Control Module (BCM) monitors the Wiper Mode Select Switch. The BCM sets the OBDII code when the Wiper Mode Select Switch is not to factory specifications.

OBDII Code B1438 - Wiper Mode Select Switch Circuit Failure - AutoCodes.com — B1438 Code - Wiper Mode Select Switch Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1438?

Faulty Wiper Mode Select Switch
Wiper Mode Select Switch harness is open or shorted
Wiper Mode Select Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1438?

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 B1438 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 B1438 code?

Need more information on how to fix the B1438 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1438 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 B1438 Code

1. What are the common symptoms of OBDII code B1438 (Wiper Mode Select Switch Circuit Failure)?

- Common symptoms include malfunctioning wiper mode select switch, non-responsive wipers, or erratic wiper behavior.

2. What are the possible causes of OBDII code B1438?

- The code B1438 can be triggered by issues such as a faulty wiper mode select switch, damaged wiring or connectors, or a malfunctioning wiper control module.

3. How can I diagnose the cause of OBDII code B1438?

- Diagnosis involves visually inspecting the wiper mode select switch, checking for loose or damaged connections, and using a multimeter to test the switch's functionality.

4. Can I still drive my vehicle with OBDII code B1438 present?

- It is not recommended to drive the vehicle with this code active, as it can affect the operation of the windshield wipers, compromising visibility in various weather conditions.

5. How do I repair OBDII code B1438 (Wiper Mode Select Switch Circuit Failure)?

- Repair options include replacing the faulty wiper mode select switch, repairing damaged wiring or connectors, or replacing the wiper control module if necessary.

6. Is it possible to reset OBDII code B1438 without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, it is crucial to address the root cause to prevent further issues with the wiper system.

7. Are there any preventive measures to avoid OBDII code B1438 in the future?

- Regularly inspecting and maintaining the wiper system, including the wiper mode select switch and related components, can help prevent the recurrence of code B1438.

8. Can extreme weather conditions contribute to triggering OBDII code B1438?

- Yes, extreme weather conditions such as heavy rain, snow, or ice can exacerbate existing issues with the wiper system, potentially leading to the activation of code B1438.

9. Is it possible to repair OBDII code B1438 at home, or should I seek professional assistance?

- Depending on your mechanical skills and access to tools, you may be able to address code B1438 at home. However, if you are unsure or uncomfortable with the repair process, it is advisable to seek professional help.

10. Does OBDII code B1438 pose any safety risks if left unresolved?

- Yes, leaving OBDII code B1438 unresolved can compromise your safety on the road, as it may lead to unpredictable wiper behavior and reduced visibility during inclement weather conditions.