P0571 on 2005-2010 Pontiac G6 — Cruise Control/Brake Switch "A" Circuit Malfunction
1 vehicles · 1 makes
How to diagnose and fix P0571: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Pontiac G6 · 2005–2010
If you own a 2005-2010 Pontiac G6 built between May 26, 2004 and January 4, 2010, it falls under GM's safety recall 14V252000. The defect is increased resistance in the Body Control Module (BCM) connection, which can produce voltage fluctuations on the Brake Apply Sensor (BAS) circuit. Per NHTSA, one result of those fluctuations is improper brake light operation. Because the problem lies in the electrical connection feeding the BCM and BAS rather than in a single failed component, it is corrected by treating and securing the connectors themselves. The G6 was one of four GM cars swept up in this campaign alongside the Chevrolet Malibu, Malibu Maxx and Saturn Aura; the 2,440,524-vehicle figure NHTSA publishes is the total for the entire campaign, not for the G6 alone. NHTSA rates the consequence as an increased risk of a crash.
Common Symptoms
- Brake lights not operating properly
How to Fix
Correction is free of charge at a GM dealer. The dealer secures the wiring harness to the BCM with a spacer, applies dielectric lubricant to the BCM harness connector and to the Brake Apply Sensor harness connector, and relearns the brake pedal home position. Owners received an interim letter dated July 14, 2014, with the recall beginning August 18, 2014. Since the G6 line has been discontinued, check the VIN at nhtsa.gov/recalls to see if the remedy is still outstanding, and contact GM customer service at 1-800-222-1020 to arrange a dealer that will perform it.
Sources for this issue (1)
Find P0571 by make
Browse every documented model and issue for your make.
P0571 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0571 mean?
P0571 stands for "Cruise Control/Brake Switch "A" Circuit Malfunction." The brake switch ('A' circuit) signals the PCM and cruise control system when the brake pedal is applied, which must disengage cruise control. P0571 sets when the PCM detects a malfunction in the cruise control/brake switch 'A' circuit.
What are the most common causes of P0571?
The most common causes of P0571 are: Faulty brake light switch, Misadjusted brake switch, Open or shorted brake switch wiring, Blown brake circuit fuse, Corroded connector. The specific cause varies by vehicle.
How much does it cost to fix P0571?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0571?
Au7o has documented P0571 across 1 vehicle models from 1 manufacturers: Pontiac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.