P1571 on 2006-2011 Hyundai Accent: Brake Switch Malfunction Causes and Fixes

What's Unique About the 2006-2011 Hyundai Accent

The 2006-2011 (MC generation) Accent is highly prone to this specific failure. Hyundai issued multiple massive safety recalls for faulty brake light switches across this entire model generation and many others. The original switches were known to fail intermittently, creating significant safety hazards. Separately, but just as common, the small plastic stopper pad that the switch presses against becomes brittle and disintegrates, which also causes the switch to send an incorrect signal (or a constant 'on' signal). This is a well-documented issue across many Hyundai and Kia models from this era.

Symptoms You May Notice

• Brake lights do not work when the pedal is pressed.
• Brake lights stay on even when the pedal is not pressed, potentially draining the battery.
• Unable to shift the automatic transmission out of the 'Park' position.
• Cruise control cannot be engaged or will not disengage when pressing the brake pedal.
• Electronic Stability Control (ESC) warning light is illuminated on the dashboard.
• Check Engine Light is on.

Most Likely Causes

1. Faulty Brake Light Switch (Stop Lamp Switch) 🔴 High Probability → Shop Brake Light Switch This part was the subject of several major safety recalls (including NHTSA campaign 13V113000 and Hyundai recall 110) for the 2006-2011 Accent due to a high rate of intermittent failure from internal contacts burning out.
   How to confirm: First, check your VIN on the NHTSA or Hyundai website for open recalls. If the brake pedal stopper pad (see next cause) is intact but the brake lights are inoperative or stuck on, the switch itself has likely failed internally. A multimeter can be used to test for continuity across the switch's pins.
   Typical fix: Replace the brake light switch with the updated part specified by the recall. The switch is located on the brake pedal arm and is replaced by disconnecting the connector, loosening a 14mm lock nut, and unscrewing it. 🎬 See this step-by-step brake switch replacement walkthrough
   Est. part cost: $10-$30
2. Disintegrated Brake Pedal Stopper Pad 🔴 High Probability → Shop Brake Pedal The small plastic/rubber pad on the brake pedal arm that makes contact with the switch plunger becomes brittle with age and heat, then crumbles and falls out. This is an extremely common failure on many Hyundai and Kia models of this era.
   How to confirm: Look on the driver's side floor mat for small, broken pieces of hard, colorful plastic. Then, visually inspect the metal brake pedal arm up under the dash. You will see a small, empty hole where the switch's plunger now passes through instead of being depressed. This allows the switch to remain in the 'on' position, keeping the brake lights illuminated.
   Typical fix: Insert a new stopper pad into the hole on the brake pedal arm. This is a simple, tool-free repair that takes only a few minutes. 🎬 Watch: How to replace the brake pedal stopper pad Some owners report using a coin and tape as a temporary fix to get home.
   Est. part cost: $2-$10

Rare But Worth Checking

• Blown Fuse: A blown fuse for the stop lamp circuit can mimic a failed switch. Always check the appropriate fuse in the interior fuse panel before replacing parts. The fuse is typically labeled 'STOP LP'.
• Wiring or Connector Issue: Less commonly, the wiring or electrical connector to the brake light switch can become damaged or corroded, causing an open or short circuit.
• Improperly Adjusted Brake Light Switch: → Shop Brake Light Switch If the switch was recently replaced or disturbed, it may be improperly adjusted. The switch is threaded and held by a locknut, allowing its position relative to the pedal arm to be changed. If it's too far in or out, it will send a constant 'on' or 'off' signal.

Diagnosis Steps

1. Check for open safety recalls for the brake light switch using your vehicle's VIN on the Hyundai or NHTSA website.
2. Carefully inspect the driver's side floor mat for any broken plastic fragments. This is the clearest sign of a failed stopper pad.
3. With a flashlight, look at the brake pedal arm under the dashboard. Check if the plastic/rubber stopper pad is present in the small hole that contacts the brake light switch plunger. If it's missing, this is your problem.
4. If the stopper pad is intact, have an assistant stand behind the car. Observe if the brake lights function correctly as you press and release the brake pedal.
5. If the lights are stuck on or do not work, and the stopper pad is good, the brake light switch is the most likely culprit.
6. Check the 'STOP LP' fuse in the interior fuse box.
7. If a new switch has been installed, ensure it is properly adjusted. The threaded body must be positioned so the plunger is fully depressed when the pedal is at rest, but not overly tight. A clearance of 0.5-1.0mm is specified.
8. Using a multimeter, test the switch connector for ~12V at the power feed wire with the ignition on. If power is present, test the switch itself for correct continuity.
9. If all else fails, inspect the wiring and connector at the brake light switch for any visible damage, corrosion, or loose connections.

Parts You'll Likely Need

• Brake Pedal Stopper Pad (OEM #32876-25000) — This is the most common and cheapest failure. The original plastic becomes brittle and disintegrates, preventing the brake switch from being activated correctly. This part is used across a vast number of Hyundai and Kia models.
  Trusted brands: Genuine Hyundai/Kia
  OEM price range: $2-$10
  Aftermarket price range: $2-$8
• Brake Light Switch (Stop Lamp Switch) (OEM #93810-25300) — This switch was the subject of a massive safety recall and is known to fail. If the stopper pad is intact, this switch is the next logical part to replace. The recall procedure involves replacing it with an improved part.
  Trusted brands: Genuine Hyundai, Beck/Arnley, Standard Motor Products, Duralast
  OEM price range: $20-$35
  Aftermarket price range: $10-$25

Related Codes That Often Appear With This One

• P0571 — This is the generic SAE equivalent of P1571. Some scanners may show one or both codes for the same brake switch circuit fault.
• P0703 — This code indicates a fault in the 'Brake Switch B Circuit'. The switch assembly often contains two separate circuits for redundancy; one may trigger P1571/P0571 and the other may trigger P0703.
• C1513 — In some Hyundai models, if the system sees the brake switch as 'ON' for an extended period (e.g., over 60 seconds) without corresponding brake pressure, it can set a C1513 code. This can happen when a failed stopper pad leaves the brake lights on.

Technical Service Bulletins (TSBs) & Recalls

• Hyundai TSB 13-BE-005: This bulletin relates to recall 131 and provides the service procedure for replacing the stop lamp switch, warning technicians to only use the new, improved part and not install the previous version.
• Hyundai TSB 13-AT-005-1: While not directly for P1571, this TSB addresses harsh or delayed shifting in automatic transaxles for 2007-2010 Elantras, which share some components. It shows the level of diagnostic detail available and could be relevant if transmission issues are suspected alongside P1571.

Platform-Specific Known Issues

• Safety Recall 13V113000 / Hyundai Recall 110: A widespread recall was issued for the 2007-2011 Accent (and many other Hyundai/Kia models) to replace the faulty stop lamp switch. The official documents cite intermittent operation, failure to illuminate brake lights, inability to shift from park, and ESC light illumination as the key symptoms.
• Safety Recall Expansion / Hyundai Recall 131: The initial recall was expanded to include more vehicles, including 2009-2011 Accents, for the same brake light switch issue.

Mechanic-Grade Diagnostic Values

• Brake Light Switch Continuity Test (4-pin switch) — expected: With switch unplugged: Pins 1 & 2 show continuity when plunger is out (pedal pressed) and no continuity when plunger is in (pedal released). Pins 3 & 4 show continuity when plunger is in (pedal released) and no continuity when plunger is out (pedal pressed).. Failure: Any deviation, such as continuity in both states or no continuity at all, indicates a failed switch.
• Brake Light Switch Connector Voltage — expected: With the ignition ON, one of the pins in the wiring harness connector should show ~12V (battery voltage) at all times.. Failure: A reading of 0V indicates a blown 'STOP LP' fuse or a wiring issue upstream of the switch.
• Brake Light Switch Adjustment Clearance — expected: 0.5 ~ 1.0mm of clearance between the stop lamp switch outer case and the pedal stopper when the pedal is fully released.. Failure: Incorrect clearance can cause the lights to stay on or not activate properly.

Scan Tool Commands That Help

• Hyundai GDS (Global Diagnostic System): Current Data / Live Data — Use this function to monitor the brake switch status ('On'/'Off') in real-time while pressing and releasing the brake pedal. This is extremely useful for confirming the repair or diagnosing an intermittent fault that is hard to replicate.

Wiring & Ground Locations

• S13 — On the brake pedal assembly.. This is the component identifier for the Brake Pedal Position (BPP) switch in the 2006-2010 Accent wiring diagrams, which is the part at the center of the P1571 fault.
• M50 — On the brake pedal assembly.. This is the component identifier for the Stop Lamp Switch in wiring diagrams for the preceding 'LC' generation Accent. While from an older model, it confirms the component's designation in Hyundai schematics.

Real Owner Repair Stories

• YouTube - 'Brake lights stay on? How to fix it yourself!' (2002 Hyundai Santa Fe (problem is common across Hyundai models of the era)) — Brake lights would stay on continuously, even with the car off, draining the battery.
  ❌ Tried (didn't work) The owner initially assumed the switch itself was faulty.
  ✅ What actually fixed it The problem was a misadjusted switch. The two lock nuts on the threaded body of the switch had backed off over 100,000 miles, causing the switch to lose its correct position relative to the pedal. The final fix was to properly thread the switch to the correct depth and tighten the lock nuts, without replacing any parts.

OEM Part Supersession History

• 93810-25100 → 93810-25300 — The original switch design was prone to intermittent failure and was the subject of a major safety recall. The new part number is the improved version.
  Heads up: Do not install an old-stock part with the previous number; always use the superseded part number for the repair.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Timing Belt Replacement Interval 🔴 High — The 1.6L Alpha II engine is an interference engine. The belt requires replacement at recommended intervals (typically 60,000-90,000 miles). Failure will cause catastrophic engine damage.
• Power Steering Failure / Noise 🟠 Medium — Some owners report issues with the power steering, including slipping belts causing intermittent loss of assist, or failure of the electronic power steering (EPS) motor coupler in later models, leading to a clunking noise.
• Ignition Coil Failure 🟡 Low — Failure of individual ignition coils can lead to engine misfires (codes P0300-P0304) and rough running. This is a relatively common issue on many vehicles of this era.
• Automatic Transaxle Shifting Issues 🟠 Medium — Some owners have reported harsh or delayed shifting, which can sometimes be attributed to faulty sensors or, in some cases, require a PCM/TCM software update or transaxle replacement. (Ref: TSB 13-AT-005-1)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific repair, buying a used part from a junkyard is NEVER a smart choice.

What to inspect on the donor part:

• Do not source these parts from a donor vehicle.

OEM-only on this vehicle (don't cheap out):

• Brake Light Switch (Stop Lamp Switch)
• Brake Pedal Stopper Pad

Aftermarket brands forum-validated for this vehicle:

• Standard Motor Products
• Beck/Arnley

Brands owners have reported issues with on this vehicle:

• Avoid unbranded, no-name parts from online marketplaces. Given the low cost of reputable brands, the savings are not worth the risk of premature failure.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0300 — General misfire code that may appear alongside other issues if the vehicle is experiencing ignition coil failure, a known common issue for this model.
• P0301 — Cylinder 1 misfire; ignition coil failures are noted as a common low-severity issue for the Accent.
• P0302 — Cylinder 2 misfire; related to the common failure of individual ignition coils on this engine platform.
• P0303 — Cylinder 3 misfire; often occurs due to the same ignition coil aging issues seen in the 2006-2011 Accent.
• P0304 — Cylinder 4 misfire; part of the P0300-P0304 series of codes common when ignition coils fail on this vehicle.

Frequently Asked Questions