B318A 2015 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 2015 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.
Code B318A 2015 Chevrolet Silverado Description
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.
What are the Possible Causes of the DTC B318A 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?
Need more information on how to fix the B318A 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B318A 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B318A 2015 Chevrolet Silverado Code
1. What does the OBDII code B318A mean on a 2015 Chevrolet Silverado?
The code B318A indicates an issue with the left rear window switch circuit, often related to communication or electrical problems.
2. What are common symptoms of code B318A in a 2015 Chevrolet Silverado?
Symptoms include the left rear window not responding to switch commands, intermittent operation, or no movement at all.
3. What causes code B318A to appear in a 2015 Chevrolet Silverado?
Common causes include a faulty left rear window switch, damaged wiring or connectors, or an issue with the Body Control Module (BCM).
4. Can a blown fuse trigger code B318A in a 2015 Chevrolet Silverado?
Yes, a blown fuse in the power window circuit can cause this code by disrupting the electrical supply to the left rear window switch.
5. How can I troubleshoot code B318A on my 2015 Chevrolet Silverado?
Start by inspecting the left rear window switch, wiring, and connectors for damage or corrosion. Test for power and ground at the switch, and check for continuity in the circuit.
6. Do I need to replace the left rear window switch to fix code B318A?
Not always. The issue could also be with the wiring, connectors, or BCM, so proper diagnosis is essential before replacing any parts.
7. Can a software update resolve code B318A in a 2015 Chevrolet Silverado?
In some cases, a software update to the BCM might fix communication issues related to this code. Check with a dealership for updates.
8. How much does it cost to repair code B318A on a 2015 Chevrolet Silverado?
Repair costs vary, but replacing the switch typically costs $50–$150 for parts, plus labor. Wiring or BCM repairs will be more expensive.
9. Can I still drive my 2015 Chevrolet Silverado with code B318A active?
Yes, you can drive the vehicle, but the left rear window may not function properly until the issue is resolved.
10. Will clearing the B318A code fix the problem in my 2015 Chevrolet Silverado?
Clearing the code will only erase it temporarily. If the underlying issue isn’t fixed, the code will return.
Discuss the causes and fixes for B318A 2015 Chevrolet Silverado OBDII Code
Code B318A 2015 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
