B1840 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC B1840 GMC?
- 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 GMC?
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 GMC 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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Information for Specific GMC Models
- B1840 2014 GMC Sierra — Driver Seat Lumbar Up Switch Circuit
- B1840 2015 GMC Sierra — Driver Seat Lumbar Up Switch Circuit
- B1840 2016 GMC Sierra — Driver Seat Lumbar Up Switch Circuit
- B1840 2017 GMC Sierra — Driver Seat Lumbar Up Switch Circuit
- B1840 2018 GMC Sierra — Driver Seat Lumbar Up Switch Circuit
Frequently Asked Questions about B1840 GMC Code
1. What are the common symptoms of OBDII code B1840 GMC related to the Driver Seat Lumbar Up Switch Circuit?
- Common symptoms include the driver seat lumbar up switch not functioning, the lumbar support not adjusting properly, or intermittent issues with the lumbar adjustment.
2. What are the possible causes of OBDII code B1840 GMC for the Driver Seat Lumbar Up Switch Circuit?
- Possible causes can include a faulty lumbar up switch, damaged wiring or connectors in the circuit, or a malfunctioning seat control module.
3. How can I diagnose OBDII code B1840 GMC for the Driver Seat Lumbar Up Switch Circuit?
- Diagnose by inspecting the lumbar up switch for damage, checking the wiring and connectors for any issues, and using a scan tool to communicate with the seat control module for fault codes.
4. Can I repair OBDII code B1840 GMC related to the Driver Seat Lumbar Up Switch Circuit myself?
- Depending on your experience and tools available, you may be able to repair the issue yourself by replacing the faulty lumbar up switch, repairing damaged wiring, or addressing any connector issues.
5. Are there any tips for fixing OBDII code B1840 GMC for the Driver Seat Lumbar Up Switch Circuit?
- Tips include ensuring proper connection of the lumbar up switch, checking for loose or damaged wiring, and consulting the vehicle's service manual for specific diagnostic and repair procedures.
6. Is it safe to drive with OBDII code B1840 GMC related to the Driver Seat Lumbar Up Switch Circuit?
- It is generally safe to drive with this code, but it may result in inconvenience due to the lack of functioning lumbar support adjustment for the driver's seat.
7. How do I reset OBDII code B1840 GMC for the Driver Seat Lumbar Up Switch Circuit?
- You can reset the code using an OBDII scan tool by clearing the diagnostic trouble codes after addressing the underlying issue with the driver seat lumbar up switch circuit.
8. Can extreme temperatures affect OBDII code B1840 GMC for the Driver Seat Lumbar Up Switch Circuit?
- Extreme temperatures can potentially impact the electrical components involved in the driver seat lumbar up switch circuit, leading to intermittent issues or malfunctions.
9. Will OBDII code B1840 GMC for the Driver Seat Lumbar Up Switch Circuit cause the airbag warning light to come on?
- This code is specific to the driver seat lumbar up switch circuit and should not directly cause the airbag warning light to illuminate. However, it's always recommended to address any diagnostic trouble codes promptly.
10. How long does it typically take to repair OBDII code B1840 GMC related to the Driver Seat Lumbar Up Switch Circuit?
- The repair time can vary depending on the exact cause of the issue, your experience level, and the availability of parts. Simple repairs like replacing a faulty switch may take less than an hour, while more complex wiring issues could take longer to diagnose and fix.
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