AutoCodes – Chevrolet – B318A 2018 Chevrolet Silverado

B318A 2018 Chevrolet Silverado Code - Left Rear Window Switch

Quick Answer

The driver and passenger window motors supply 12 V signal circuits to their respective window switches, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0 V. Common causes include Faulty Left Rear Window Switch, Left Rear Window Switch harness is open or shorted, Left Rear Window 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: B318A 2018 Chevrolet Silverado indicates Left Rear Window Switch.
Common causes: Common causes include Faulty Left Rear Window Switch, Left Rear Window Switch harness is open or shorted, Left Rear Window 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 184

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 Jun 11, 2023

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 B318A 2018 Chevrolet Silverado Description

The driver and passenger window motors supply 12 V signal circuits to their respective window switches, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0 V. The window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction.
The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the Body Control Module (BCM). The BCM examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the passenger window motor or to the appropriate rear window switch which will perform the command as requested.

OBDII Code B318A 2018 Chevrolet Silverado - Left Rear Window Switch - AutoCodes.com — B318A 2018 Chevrolet Silverado Code - Left Rear Window Switch

What does this mean?

What are the Possible Causes of the DTC B318A 2018 Chevrolet Silverado?

Faulty Left Rear Window Switch
Left Rear Window Switch harness is open or shorted
Left Rear Window Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B318A 2018 Chevrolet Silverado?

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 B318A 2018 Chevrolet Silverado 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 B318A 2018 Chevrolet Silverado code?

Need more information on how to fix the B318A 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B318A 2018 Chevrolet Silverado 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 B318A 2018 Chevrolet Silverado Code

1. What does OBDII code B318A mean for a 2018 Chevrolet Silverado Left Rear Window Switch?

The code B318A indicates a fault with the left rear window switch on a 2018 Chevrolet Silverado.

2. What are some common symptoms of OBDII code B318A in a 2018 Chevrolet Silverado?

Common symptoms of code B318A may include the left rear window not responding to switch commands or functioning intermittently.

3. What are possible causes of OBDII code B318A in a 2018 Chevrolet Silverado?

Potential causes of code B318A include a faulty left rear window switch, wiring issues, or a malfunction in the window control module.

4. How can I diagnose the cause of OBDII code B318A in my 2018 Chevrolet Silverado?

To diagnose code B318A, you can start by checking the left rear window switch for physical damage, testing the switch's functionality, inspecting the wiring for any visible issues, and using a diagnostic tool to scan the window control module.

5. Can I repair OBDII code B318A in my 2018 Chevrolet Silverado at home?

If the issue is with the left rear window switch itself, it may be possible to replace the switch at home if you have the necessary tools and expertise. However, if the problem lies with the wiring or control module, it's recommended to seek professional assistance.

6. Is it safe to continue driving with OBDII code B318A in a 2018 Chevrolet Silverado?

While the vehicle may still be operational with code B318A, it's best to address the issue promptly to ensure the left rear window functions correctly and to prevent any potential electrical problems.

7. How much does it typically cost to repair OBDII code B318A in a 2018 Chevrolet Silverado?

The cost of repairing code B318A can vary depending on the exact cause of the issue. Replacing a faulty window switch may cost less compared to fixing wiring or module problems. It's advisable to obtain quotes from reputable mechanics or dealerships.

8. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B318A in a 2018 Chevrolet Silverado?

If you have experience working on automotive electrical systems and access to the necessary tools, you may be able to troubleshoot and repair code B318A yourself. However, if you're unsure or uncomfortable with the task, it's best to consult a professional.

9. Are there any recalls or technical service bulletins related to OBDII code B318A in a 2018 Chevrolet Silverado?

It's recommended to check with Chevrolet dealerships or online databases for any recalls or technical service bulletins specifically addressing code B318A in the 2018 Silverado. Manufacturers may offer solutions or assistance for known issues.

10. How can I prevent OBDII code B318A from occurring in my 2018 Chevrolet Silverado in the future?

To prevent code B318A, you can regularly inspect and maintain the electrical components related to the left rear window switch, avoid excessive force when operating the switch, and address any issues promptly to prevent further damage.