P0571 Cadillac Code - Cruise Control Brake Switch Circuit
Quick Answer
The Engine Control Module (ECM) monitors the Brake Pedal Position Sensor. Common causes include Faulty Brake Pedal Position Sensor, Misadjusted Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted. 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
- P0571 Cadillac indicates Cruise Control Brake Switch Circuit.
- Common causes
- Common causes include Faulty Brake Pedal Position Sensor, Misadjusted Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted.
- 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 P0571 Cadillac Description
This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. When the ECM detects that there is a 4.2 km/h (2.6 mph) or greater decrease in vehicle speed within 0.25 seconds without a transition of the stop lamp switch, the ECM sets Diagnostic Trouble Code (DTC) P0571.
The DTC will be set when the BCM detects either a low voltage signal on the stop lamp switch signal circuit when the serial data message from the ECM indicates the brakes are applied or a high voltage signal on the stop lamp switch signal circuit when the serial data message from the ECM indicates the brakes are not applied.
What are the Possible Causes of the DTC P0571 Cadillac?
- Faulty Brake Pedal Position Sensor
- Misadjusted Brake Pedal Position Sensor
- Brake Pedal Position Sensor harness is open or shorted
- Brake Pedal Position Sensor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC P0571 Cadillac?
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 P0571 Cadillac 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 P0571 Cadillac Code
1. What are the common symptoms of OBDII code P0571 in a Cadillac related to the Cruise Control Brake Switch Circuit?
- Common symptoms include inoperative cruise control, inability to set cruise control, and the cruise control light staying on or flashing.
2. What are the possible causes of OBDII code P0571 in a Cadillac?
- The most common cause is a faulty brake light switch, which may be stuck in the off position or not functioning properly.
3. How can I diagnose the issue causing OBDII code P0571 in my Cadillac?
- To diagnose the problem, you can start by checking the brake lights to see if they are working correctly when the brake pedal is pressed. If the brake lights do not illuminate, it is likely a sign of a faulty brake light switch.
4. Can I still drive my Cadillac with OBDII code P0571 present?
- While it is possible to drive with this code, it is not recommended as it may affect the proper functioning of the cruise control system. It is best to address the issue as soon as possible.
5. How can I repair OBDII code P0571 in my Cadillac?
- The most common repair for this code is to replace the faulty brake light switch. This typically involves locating the switch near the brake pedal and installing a new one.
6. Are there any DIY tips for troubleshooting OBDII code P0571 in a Cadillac?
- Before replacing the brake light switch, you can try checking the wiring and connectors for any visible damage or loose connections. Sometimes, a simple adjustment or cleaning can resolve the issue.
7. Will resetting the OBDII code P0571 in my Cadillac fix the problem?
- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the code. It is best to address the root cause of the problem for a permanent solution.
8. Can a mechanic help me fix OBDII code P0571 in my Cadillac?
- Yes, a qualified mechanic can diagnose and repair the issue causing the code. They will have the necessary tools and expertise to efficiently address the problem.
9. Is OBDII code P0571 specific to Cadillac vehicles only?
- No, OBDII code P0571 related to the Cruise Control Brake Switch Circuit can appear in various vehicle makes and models, not just limited to Cadillacs.
10. What is the importance of addressing OBDII code P0571 promptly in a Cadillac?
- Promptly addressing this code is essential to ensure the proper functioning of the cruise control system and overall safety while driving. Ignoring the issue can lead to potential hazards on the road.
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