B1840 2018 GMC Sierra Code - Driver Seat Lumbar Up Switch Circuit
Quick Answer
The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster 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
- B1840 2018 GMC Sierra indicates Driver Seat Lumbar Up Switch Circuit.
- Common causes
- Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster 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 B1840 2018 GMC Sierra Description
What are the Possible Causes of the DTC B1840 2018 GMC Sierra?
- Faulty Driver Seat Adjuster Switch
- Driver Seat Adjuster Switch harness is open or shorted
- Driver Seat Adjuster Switch circuit poor electrical connection
- Faulty Seat Memory Control Module
How to Fix the DTC B1840 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 B1840 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 B1840 2018 GMC Sierra code?
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Frequently Asked Questions about B1840 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code B1840 in a 2018 GMC Sierra related to the Driver Seat Lumbar Up Switch Circuit?
- The common symptoms include the driver seat lumbar up switch not functioning properly or not responding when pressed.
2. What are the possible causes of OBDII code B1840 in a 2018 GMC Sierra?
- The possible causes include a faulty driver seat lumbar up switch, wiring issues in the circuit, or a malfunctioning control module.
3. How can I diagnose the issue related to OBDII code B1840 in my 2018 GMC Sierra?
- You can start by checking the wiring connections to the driver seat lumbar up switch, testing the switch for continuity, and using a diagnostic scanner to retrieve more specific information.
4. Can I repair OBDII code B1840 in my 2018 GMC Sierra myself?
- Depending on your skills and experience with automotive repairs, you may be able to repair the issue yourself by replacing the faulty switch, repairing any damaged wiring, or resetting the control module.
5. Is it safe to continue driving my 2018 GMC Sierra with OBDII code B1840 present?
- It is generally not recommended to ignore OBDII codes, as they indicate potential issues that could affect the vehicle's performance or safety. It's best to address the problem as soon as possible.
6. How much does it typically cost to repair OBDII code B1840 in a 2018 GMC Sierra?
- The cost of repairs can vary depending on the exact cause of the issue, the parts needed, and whether you choose to do the repairs yourself or take the vehicle to a professional mechanic.
7. Are there any temporary solutions to address OBDII code B1840 in my 2018 GMC Sierra?
- While temporary solutions may vary depending on the specific issue, you can try checking and securing any loose wiring connections or fuses related to the driver seat lumbar up switch.
8. Will resetting the vehicle's computer clear OBDII code B1840 in my 2018 GMC Sierra?
- Resetting the computer may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again.
9. Can extreme temperatures or humidity affect the driver seat lumbar up switch circuit in a 2018 GMC Sierra?
- Extreme temperatures or humidity can potentially cause electrical components to malfunction, so it's important to keep the vehicle's interior environment stable to avoid such issues.
10. How can I prevent OBDII code B1840 from recurring in my 2018 GMC Sierra after repairs?
- To prevent the code from recurring, ensure that any repairs are done properly, regularly inspect the wiring and components related to the driver seat lumbar up switch, and address any issues promptly.
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