Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble communicating with the brake system. It's like when two friends are trying to talk, but one can't hear the other properly.
The P1782 code indicates a problem with the communication of the brake signal over the Controller Area Network (CAN) bus.
P1782 is triggered when the vehicle's powertrain control module (PCM) or transmission control module (TCM) detects an issue with the brake signal being transmitted over the CAN bus. This could be due to a malfunction in the brake switch, wiring issues, or a problem with the CAN bus itself.
• Check Engine Light is on
• Brake warning light may be illuminated
• Transmission may not shift properly
• Reduced fuel efficiency
• Faulty brake switch
• Wiring issues or poor connections
• Faulty CAN bus communication
• Malfunctioning PCM or TCM
CAN: Controller Area Network, a communication system used in vehicles.
PCM: Powertrain Control Module, the computer that controls the engine and transmission.
• Check for other error codes
• Inspect brake switch and related wiring
• Test CAN bus communication
• Verify PCM/TCM functionality
• Replace or repair the brake switch
• Fix any wiring issues or poor connections
• Repair or replace faulty CAN bus components
• Reprogram or replace PCM/TCM if necessary
• OBD-II scanner
• Multimeter
• Wiring diagram
• CAN bus diagnostic tool
$100 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regularly inspect brake system components
• Ensure all electrical connections are secure
• Perform routine vehicle diagnostics
Communication Issue
• Avoid driving at high speeds until the issue is resolved
• Have a professional diagnose the problem
• Monitor for any changes in vehicle performance
Check if the vehicle is still under warranty for potential coverage of repairs.
This code has been more common in vehicles with complex electronic systems where CAN bus communication is critical.
Moderate – While the vehicle may still be drivable, addressing the issue promptly can prevent further damage.
Ignoring this code could lead to unsafe driving conditions and may affect vehicle performance.
• Vehicle at operating temperature
• Stationary with engine running
The brake switch is typically located near the brake pedal, while the CAN bus wiring runs throughout the vehicle.
Q: Can I drive with a P1782 code?
A: It's not recommended to drive extensively with this code as it may affect braking and transmission performance.
Q: How do I reset the P1782 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
View on Amazon
Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
View on Amazon
Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.