C1291 Code - Open Brake Lamp Switch Contacts During Deceleration
Quick Answer
The diagnostic trouble code C1291 indicates an issue with the brake lamp switch contacts being open during deceleration. Common causes include Faulty brake lamp switch, Loose or damaged wiring connections, Corrosion in the brake lamp switch contacts. 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 indicates Open Brake Lamp Switch Contacts During Deceleration.
- Common causes
- Common causes include Faulty brake lamp switch, Loose or damaged wiring connections, Corrosion in the brake lamp switch contacts.
- 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.
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Code C1291 Description
The diagnostic trouble code C1291 indicates an issue with the brake lamp switch contacts being open during deceleration. This means that when you are slowing down or coming to a stop, the brake lamp switch is not functioning correctly. The brake lamp switch is responsible for turning on the brake lights when you press the brake pedal, alerting other drivers that you are slowing down or stopping.
Common Causes of C1291
- Faulty brake lamp switch
- Loose or damaged wiring connections
- Corrosion in the brake lamp switch contacts
- Faulty brake pedal position sensor
- Issues with the vehicle's electronic control module (ECM)
Symptoms of C1291
- Brake lights not illuminating when the brake pedal is pressed
- ESC warning light illuminated on the dashboard
- Vehicle may not shift out of park
- Cruise control not working properly
How to Fix C1291
- Begin by locating the brake lamp switch near the brake pedal.
- Inspect the wiring connections for any signs of damage or corrosion. Replace any damaged wires.
- Test the brake lamp switch using a multimeter to check for continuity. Replace the switch if it is faulty.
- If the switch is functioning correctly, check the brake pedal position sensor for any issues.
- Clear the diagnostic trouble code from the vehicle's computer using an OBD-II scanner.
Cost to Fix C1291
The cost of repairing an open brake lamp switch contacts during deceleration can vary depending on the specific issue causing the problem. On average, the cost of replacing a faulty brake lamp switch can range from $50 to $150 for the part, with additional labor costs of around $80 to $150 per hour. In total, the repair could cost between $150 to $300, but it's advisable to get a specific quote from a local auto repair shop based on your vehicle make and model.
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Code C1291 Information for Specific Makes
- C1291 Buick — Open Brake Lamp Switch Contacts During Deceleration
- C1291 Cadillac — Open Brake Lamp Switch Contacts During Deceleration
- C1291 Chevrolet — Open Brake Lamp Switch Contacts During Deceleration
- C1291 GMC — Open Brake Lamp Switch Contacts During Deceleration
Frequently Asked Questions about C1291 Code
1. What are the common symptoms of OBDII code C1291?
When OBDII code C1291 is triggered, you may experience issues such as the brake lights staying on constantly or not illuminating at all, the brake pedal feeling spongy, or the vehicle going into limp mode.
2. What causes the OBDII code C1291 to be set?
The code C1291 is set when the brake lamp switch contacts are detected as open during deceleration, indicating a fault in the brake lamp switch circuit or the switch itself.
3. How can I diagnose the cause of OBDII code C1291?
To diagnose the cause of code C1291, you can start by checking the brake lamp switch for proper adjustment and continuity, inspecting the wiring and connectors for any damage, and testing the brake lamp switch operation during deceleration.
4. Can a faulty brake lamp switch be repaired, or does it need to be replaced?
In most cases, a faulty brake lamp switch will need to be replaced rather than repaired. It is a relatively inexpensive part and replacing it is a straightforward process in most vehicles.
5. Are there any DIY repair tips for resolving OBDII code C1291?
If you have experience working on vehicles, you can try adjusting the brake lamp switch to see if that resolves the issue. However, if the switch is found to be faulty, it is recommended to replace it to prevent further problems.
6. Will driving with OBDII code C1291 cause any safety hazards?
Driving with code C1291 may not directly affect the drivability of the vehicle, but it can compromise safety by causing the brake lights to malfunction. It is important to address the issue promptly to ensure proper brake light operation.
7. Can OBDII code C1291 be a false alarm?
While it is possible for a code to be triggered erroneously, it is important not to ignore code C1291, as it indicates a potential issue with the brake lamp switch that can impact safety and should be investigated.
8. How long does it typically take to repair OBDII code C1291?
The repair time for code C1291 can vary depending on the exact cause of the issue and the vehicle's make and model. In general, diagnosing and replacing a faulty brake lamp switch can be completed within an hour or two.
9. Will resetting the OBDII system clear code C1291?
Resetting the OBDII system may temporarily clear code C1291, but if the underlying issue with the brake lamp switch is not addressed, the code is likely to reappear once the problem is detected again during deceleration.
10. Is it safe to continue driving if OBDII code C1291 is present?
While the vehicle may still be operable with code C1291 present, it is advisable to address the issue promptly to ensure proper brake light functionality and avoid potential safety hazards on the road.
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