C0041
Brake Pedal Switch "B" Circuit Malfunction
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The C0041 code indicates a malfunction in the brake pedal switch 'B' circuit, as detected by the ABS control module. Many vehicles use two brake pedal switches — the primary switch (switch 'A') controls the brake lights, while the secondary switch (switch 'B') provides a redundant brake pedal input to the ABS module, cruise control system, and transmission shift interlock. This code specifically refers to the secondary switch or its circuit.
When this switch malfunctions, the ABS module loses its ability to confirm whether the driver is pressing the brake pedal. This can disable ABS, traction control, and stability control. Cruise control may also stop working because it relies on the brake switch signal to disengage. On automatic transmissions, you might have difficulty shifting out of Park since the shift interlock needs to see a brake signal.
This is typically an inexpensive and straightforward repair. The brake pedal switch is located above the brake pedal arm under the dashboard. In many cases, the issue is simply a worn-out rubber or plastic stopper pad on the pedal arm that keeps the switch in its resting position. These pads cost less than a dollar and are a common fix. If the switch itself has failed, replacement switches are usually under $30 and can be installed in 15-20 minutes.
Severity
Symptoms
- •ABS or traction control warning lights on the dashboard
- •Cruise control not working or disengaging unexpectedly
- •Brake lights may not illuminate when pressing the pedal
- •Vehicle may have difficulty shifting out of Park
- •Stability control system may be disabled
Likely Causes
The brake pedal switch 'B' (secondary brake switch used by the ABS module) can fail due to worn internal contacts, heat damage, or mechanical fatigue. Many vehicles use two separate brake switches — one for brake lights and one for the ABS/cruise control system — and either can fail independently.
The switch must be precisely positioned to activate at the correct point in the brake pedal's travel. A degraded pedal stopper pad, a shift in mounting position, or a worn pivot bushing can prevent the switch from activating properly.
Corroded connector pins, damaged wire insulation, or broken wires in the switch circuit can prevent the signal from reaching the ABS control module. The footwell area where these switches are located can collect moisture from wet shoes.
The input circuit within the ABS module that reads the brake switch signal can develop a fault, causing the module to report a switch malfunction even when the switch and wiring are functioning correctly.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the brake pedal switch
- Adjust the brake pedal switch position
- Replace the worn brake pedal stopper pad
- Repair damaged wiring or corroded connector at the switch