C1291 GMC Code - Open Brake Lamp Switch Contacts During Deceleration
Quick Answer
The stop lamp switch signal informs the Electronic Brake Control Module (EBCM) when the brake pedal is pressed. Common causes include Faulty Brake Lamp Switch, Brake Lamp Switch harness is open or shorted, Brake Lamp 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
- C1291 GMC indicates Open Brake Lamp Switch Contacts During Deceleration.
- Common causes
- Common causes include Faulty Brake Lamp Switch, Brake Lamp Switch harness is open or shorted, Brake Lamp 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 C1291 GMC Description
What are the Possible Causes of the DTC C1291 GMC?
- Faulty Brake Lamp Switch
- Brake Lamp Switch harness is open or shorted
- Brake Lamp Switch circuit poor electrical connection
How to Fix the DTC C1291 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 C1291 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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Frequently Asked Questions about C1291 GMC Code
What does the OBDII code C1291 mean for a GMC vehicle?
C1291 indicates that the brake lamp switch contacts are open during deceleration, which can affect the vehicle's braking system and stability control.
What symptoms might indicate the presence of code C1291?
Common symptoms include the brake warning light being illuminated on the dashboard, issues with the brake lights not functioning properly, and possible stability control system warnings.
What could cause the C1291 code to trigger?
Causes may include a faulty brake lamp switch, wiring issues related to the brake switch, or problems within the vehicle's electronic control module (ECM).
How can I diagnose the issue related to code C1291?
Start by inspecting the brake lamp switch and its wiring for any damage or disconnections. Use a multimeter to test the switch for proper operation and continuity.
What repairs are typically needed to fix code C1291?
Repair options may include replacing the brake lamp switch, repairing any damaged wiring, or addressing any underlying issues with the vehicle’s ECM.
Can I drive my GMC with the C1291 code?
While it may be possible to drive the vehicle, it is not recommended due to potential braking issues and the risk of stability control malfunction.
How can I reset the C1291 code after repairs?
After addressing the issue, you can reset the code using an OBDII scanner. Disconnecting the battery for a few minutes may also clear the code, but this can reset other settings.
Will the brake lights function properly if the C1291 code is present?
Not necessarily; the code indicates a problem with the brake lamp switch, which may result in brake lights not functioning as intended.
What is the importance of addressing the C1291 code promptly?
Ignoring the C1291 code can lead to unsafe driving conditions, as it may impact braking performance and vehicle stability, potentially resulting in accidents.
Discuss the causes and fixes for C1291 GMC OBDII Code
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