C0041 — Brake Pedal Switch B (Subfault)

vehicle

Is it safe to drive?

Drive with caution The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm C0041 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many C0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ABS / stability control for damage, corrosion, chafing or poor contact.
Subsystem check Read all four wheel speed PIDs while driving slowly — the faulty sensor drops out or reads implausibly.
Subsystem check Inspect the sensor and tone ring for metal debris and damage near the hub.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm C0041 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for C0041 (parts and labor, USD, independent shop rates): Repair sensor wiring: $80–$250; ABS module repair or replacement: $400–$1,200; Replace a wheel speed sensor: $120–$350. Overall, fixing C0041 usually costs between $80 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Will C0041 clear itself?

Sometimes C0041 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code C0041 mean?

C0041 — Brake Pedal Switch B (Subfault): Causes, Symptoms & Fix (C0041): a vehicle fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by failed wheel speed sensor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.

Is it safe to drive with C0041?

The base brakes usually still work, so careful driving is possible — but ABS and stability control are disabled, which lengthens stopping distances on slippery roads. Fix promptly and avoid harsh driving.

What is the most common cause of C0041?

The most common causes are: failed wheel speed sensor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.

How do I diagnose C0041 myself?

Start with a scan: confirm C0041, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ABS / stability control, and verify the suspect component against live data before buying parts.

C0041 — C0041 — Brake Pedal Switch B (Subfault): Causes, Symptoms & Fix

When your vehicle's control unit detects a problem with the brake pedal switch B circuit, it logs trouble code C0041. This specific code points to a secondary fault within the anti-lock braking and electronic stability control network — essentially a sub-fault that the module spots during its continuous self-diagnostics. The brake pedal position sensor works alongside the primary switch to confirm pedal status for the ABS computer; when the secondary switch signal fails to match expectations or drops out entirely, the system flags C0041 and illuminates the warning light.

The brake pedal switch B serves as a safety redundancy. The primary switch tells the BCM when the brakes are applied so lights and other systems respond accordingly, while the secondary sensor feeds data to the ABS module. That module relies on consistent input from both switches to manage traction control and stability interventions. If the signal from switch B becomes erratic, missing, or falls outside the expected voltage range, the ABS computer cannot trust the data and sets C0041 rather than attempting to guess pedal position. This explains why the module requires the fault to repeat under specific operating conditions before triggering the light — a single glitch will not usually set the code.

Common symptoms of C0041

When C0041 is active, drivers typically notice one or more of the following:

ABS or ESC warning lamp illuminated on the instrument cluster
Dashboard message indicating stability control is unavailable or disabled
Inoperative anti-lock braking during hard stops — standard braking still functions
Erratic or non-functional speedometer operation
Cruise control refusing to engage or disengaging unexpectedly
Changes in brake pedal feel or pulsation compared to normal

What causes C0041?

The fault almost always originates in one of three areas: wiring problems, sensor failure, or module issues. The most frequent culprits include:

Damaged wiring or corroded connectors in the brake pedal switch circuit
Faulty brake pedal switch B sensor itself
Failed wheel speed sensor triggering related ABS codes
Low voltage or blown fuse supplying the ABS module
Malfunctioning ABS module or pump motor assembly
Poor ground connection affecting the switch circuit

How to diagnose C0041

Follow this logical sequence to isolate the root cause before replacing any expensive components:

Connect an OBD2 scanner, confirm C0041 is stored, and record all freeze frame data — this snapshot shows engine load, RPM, coolant temperature, and vehicle speed at the moment the fault occurred.
Check for additional stored codes. Related P-codes or C-codes often point directly to the failing component. Review any technical service bulletins available for your specific make and model.
Perform a visual inspection of the brake pedal switch and surrounding wiring harness. Look for chafed wires, loose connectors, corrosion buildup, or any signs of water intrusion near the pedal assembly.
Test the switch B signal with a multimeter while manually operating the pedal — the voltage should transition cleanly between the specified high and low states.
If equipped, monitor live wheel speed sensor data from the scanner while slowly rolling the vehicle — a faulty sensor will produce erratic readings or drop out completely.
Clear C0041, complete a drive cycle that reproduces the freeze frame conditions, and verify the code does not return.

Repair options and costs for C0041

Addressing the most accessible and common failures first keeps costs reasonable:

Wiring repair or connector replacement: $80–$250
Brake pedal switch B replacement: $100–$300
Wheel speed sensor replacement: $120–$350
ABS module repair or replacement: $400–$1,200

Total repair cost for C0041 typically falls between $80 and $1,200 depending on which component actually failed. Wiring issues and switch replacement represent the lower end of the range and account for the majority of actual repairs. ABS module replacement is necessary only in a small percentage of cases but drives the upper cost ceiling.

Can you drive with C0041?

The conventional hydraulic brake system remains functional when C0041 is stored, so you can still stop the vehicle under normal conditions. However, both anti-lock braking and electronic stability control are disabled or operating in a limited capacity. On wet pavement, ice, or gravel, stopping distances increase noticeably without ABS intervention. The stability system cannot correct skids or loss of traction. Treat this code as a caution-level issue — the vehicle is driveable but should be repaired before relying on spirited driving or adverse weather conditions.