B318A 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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.
Need more information about the B318A 2018 GMC Sierra code?
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Frequently Asked Questions about B318A 2018 GMC Sierra Code
1. What does OBDII code B318A for the left rear window switch on a 2018 GMC Sierra indicate?
Code B318A suggests a fault with the left rear window switch on the 2018 GMC Sierra.
2. What are common symptoms of OBDII code B318A related to the left rear window switch?
Common symptoms may include the left rear window not responding to the switch commands or being stuck in a particular position.
3. What are possible causes of OBDII code B318A for the left rear window switch on a 2018 GMC Sierra?
Potential causes of code B318A could be a faulty left rear window switch, damaged wiring, or a problem with the window motor or regulator.
4. How can I diagnose the issue causing OBDII code B318A for the left rear window switch?
To diagnose the problem, you can start by checking the wiring connections, testing the switch for functionality, and inspecting the window motor and regulator for any issues.
5. What are some repair tips for resolving OBDII code B318A on a 2018 GMC Sierra's left rear window switch?
Repair tips may include replacing the faulty left rear window switch, repairing any damaged wiring, or addressing issues with the window motor or regulator if needed.
6. Can OBDII code B318A for the left rear window switch be reset after making repairs?
Once the underlying issue causing the code has been fixed, you can reset the OBDII code B318A using an OBDII scanner to clear the error code from the system.
7. Is it safe to continue driving a 2018 GMC Sierra with OBDII code B318A related to the left rear window switch?
It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure proper functionality of the left rear window.
8. Will fixing OBDII code B318A for the left rear window switch require professional assistance?
Depending on your automotive repair skills and tools, you may be able to address the issue yourself. However, seeking professional assistance is recommended if you are unsure or inexperienced.
9. Are there any recalls or technical service bulletins related to OBDII code B318A on the left rear window switch of a 2018 GMC Sierra?
It's advisable to check with the manufacturer or authorized service centers for any recalls or technical service bulletins related to OBDII code B318A for the left rear window switch on the 2018 GMC Sierra.
10. How can I prevent OBDII code B318A from occurring again on the left rear window switch of my 2018 GMC Sierra?
Regularly inspecting and maintaining the window switches, wiring, and components can help prevent OBDII code B318A from occurring again on the left rear window switch of your 2018 GMC Sierra.
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