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Home / DTC / C0041 — Brake Pedal Switch “B” (Subfault)

C0041 — Brake Pedal Switch “B” (Subfault)

Detailed page for trouble code C0041.

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Code

C0041

HYUNDAI C — Chassis

Brake Pedal Switch “B” (Subfault)

Brand: HYUNDAI
Type: C — Chassis
AI status
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Page language: EN

Causes

  • Faulty/brake pedal switch B (internally damaged or sticking)
  • Damaged, corroded, or loose connector at the switch
  • Open, short, or intermittent wiring between switch and control module
  • Incorrect switch adjustment or mounting (incorrect plunger travel)
  • Faulty receiving module (BCM/ABS/ESC) or internal input circuit
  • Software/configuration issue or failed module adaptation

Symptoms

  • Brake warning, ABS or ESC warning lamp illuminated
  • Brake lights may be inoperative or stuck on when switch fails
  • Cruise control may be disabled or disengage immediately
  • Shift-interlock or start-interlock faults on some models
  • Intermittent faults that come and go or only under certain pedal positions

What to check

  • Read and record freeze-frame and live data with a capable scan tool (verify code, occurrence history, and related codes)
  • Inspect brake pedal area: check switch mounting, plunger travel and physical damage
  • Visually inspect switch connector and wiring for corrosion, loose pins, burns or chafing
  • Check brake light operation while operating pedal (helps confirm switch contact function)
  • Back-probe switch connector and measure voltage and continuity with a multimeter
  • Perform wiggle test on wiring and connector while monitoring live data to reproduce intermittent behavior

Signal parameters

  • Switch type: normally open or normally closed depending on design (operator manual or wiring diagram to confirm)
  • Closed-contact resistance: near 0 Ω when closed; open-circuit when open (in simple mechanical switches)
  • Typical signal voltages: either switched 12 V or switched ground or low-voltage logic (often 5 V reference) — consult vehicle wiring diagram for exact levels
  • Expected signal change: definitive state change with pedal travel (no chatter)

Diagnostic algorithm

  1. Connect a diagnostic scan tool, read C0041 and any related codes, note freeze frame and live data. Clear code and test-drive or operate pedal to see if code returns.
  2. Visually inspect switch, mounting bracket and plunger for damage, correct engagement and free travel. Verify brake lights operate in step with pedal travel.
  3. With ignition ON (engine off) back-probe the switch connector and measure reference voltage, switched voltage or continuity while operating pedal. Compare to manufacturer specifications.
  4. If voltage/reference present but signal does not change correctly, remove switch and bench-test for continuity across terminals while actuating plunger. Replace if contact fails or is intermittent.
  5. If switch bench-test is good, trace and continuity-test wiring from the switch connector to the controlling module. Repair broken, shorted or high-resistance circuits. Use wiggle tests to catch intermittent faults.
  6. Check and clean connector terminals; apply dielectric grease after repair if appropriate. Reinstall switch, adjust plunger position per service manual and verify correct pedal travel and contact timing.
  7. If wiring and switch are good but fault persists, check input pin at the receiving module for correct reference/signal and inspect module grounds and power. Consider module fault if input circuit is out of expected parameters.
  8. After repair or replacement, clear codes and verify that C0041 does not return under normal operation. Record final test results and check for any required relearn/initialization procedures.

Likely causes

  • Failed brake pedal switch B (most likely)
  • Connector corrosion or bent terminals at switch
  • Broken or chafed harness between switch and module
  • Switch misadjusted or mechanically binding

Fault status

⚠️ Status
Brake Pedal Switch B subfault — signal missing, unstable, or out of expected range
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

C0040 C0042 P0571 U0121 C0051
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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