Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test O : C0040:24, C0040:64: Notes
Refer to Module Communications Network for schematic and connector information.
Normal Operation and Fault Conditions
The ABS module receives BPP and accelerator pedal position from the PCM through the GWM over the HS-CAN2. The ABS module uses the brake fluid pressure sensor in the HCU, wheel speed sensor and lateral acceleration information to verify the brake pedal position message. An incorrectly installed BPP switch can cause a signal plausibility concern. An implausible signal can also be created if the driver is resting one foot on the brake pedal while using the other foot to press the accelerator with vehicle speed above 10 km/h (6 mph).
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0040:24 | Brake Pedal Switch "A": Signal Stuck High | There are 2 conditions which can cause this DTC to set in continuous memory in the ABS module. The first condition is if the PCM CAN messages indicate the brake pedal and accelerator pedals are pressed, vehicle speed is above 10 km/h (6 mph) and the brake fluid hydraulic pressure sensor in the HCU indicates less than 500 kPa (5 bar) for more than 60 seconds. The second condition is if the PCM CAN messages indicate the brake pedal and accelerator pedals are pressed and vehicle speed is greater than 10 km/h (6 mph) for more than 30 seconds. |
| C0040:64 | Brake Pedal Switch "A": Signal Plausibility Failure | This DTC sets in continuous memory in the ABS module if the PCM CAN messages indicates the brake pedal is not being pressed, but brake hydraulic pressure is over 30 bar (435 psi) for more than 1 second. |
Possible Causes
- Wiring, terminals or connectors
- BPP switch
- Network communication concern
- PCM
- Pressing both pedals (brake and accelerator) at the same time
Visual Inspection and Diagnostic Pre-checks
- Make sure the brake pedal switch electrical connector is connected and free of corrosion and other contaminants.
- Make sure the brake pedal switch is installed correctly.
- Make sure the brake pedal switch is operating correctly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.