B318A 2015 GMC Sierra 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 GMC Sierra 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 GMC Sierra 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 GMC Sierra?
- 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 GMC Sierra?
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 GMC Sierra 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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Frequently Asked Questions about B318A 2015 GMC Sierra Code
1. What does OBDII code B318A for a 2015 GMC Sierra Left Rear Window Switch indicate?
- This code indicates a malfunction with the left rear window switch in a 2015 GMC Sierra.
2. What are some common symptoms of OBDII code B318A in a 2015 GMC Sierra?
- Common symptoms include the left rear window not responding to switch commands or operating erratically.
3. What are possible causes of OBDII code B318A in a 2015 GMC Sierra?
- Causes can include a faulty left rear window switch, wiring issues, or a problem with the window motor or regulator.
4. How can I diagnose the issue behind OBDII code B318A in my 2015 GMC Sierra Left Rear Window Switch?
- You can start by checking the wiring connections, testing the switch for continuity, and inspecting the window motor and regulator for proper function.
5. What are some repair tips for fixing OBDII code B318A in a 2015 GMC Sierra?
- Repair tips may include replacing the left rear window switch, repairing any damaged wiring, or replacing the window motor or regulator if necessary.
6. Can I reset OBDII code B318A in my 2015 GMC Sierra after making repairs?
- Yes, after addressing the underlying issue causing the code, you can use an OBDII scanner to clear the code and reset the system.
7. Is it safe to continue driving my 2015 GMC Sierra with OBDII code B318A related to the Left Rear Window Switch?
- It is not recommended to continue driving with this issue, as it may lead to further damage or safety concerns with the left rear window operation.
8. How much does it typically cost to repair OBDII code B318A in a 2015 GMC Sierra Left Rear Window Switch?
- Repair costs can vary depending on the exact cause of the issue, but expenses may include parts and labor for switch replacement, wiring repairs, or window motor/regulator replacement.
9. Are there any recalls or service bulletins related to OBDII code B318A in a 2015 GMC Sierra Left Rear Window Switch?
- You can check with GMC or a certified dealership to inquire about any relevant recalls or service bulletins for this specific issue in your vehicle.
10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B318A in a 2015 GMC Sierra?
- Depending on the specific cause of the code, some DIY enthusiasts may be able to address issues like switch replacement or basic wiring repairs, but more complex repairs may require professional assistance.
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