DTC Troubleshooting: C0040-12
DTC C0040-12: Brake Light Switch Failure (Stuck ON)/Brake Pedal Stroke Sensor Stuck (EBB)
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
C0040-12 Brake Light Switch Failure (Stuck ON)/Brake Pedal Stroke Sensor Stuck (EBB)
  

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode, then start the engine.

?4.
Test-drive the vehicle under these conditions:
Vehicle speed at 9 mph (15 km/h) or more for at least 60 seconds
Accelerator pedal pressed
Brake pedal released

NOTE: Drive the vehicle on the road, not on a lift.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
C0040-12 Brake Light Switch Failure (Stuck ON)/Brake Pedal Stroke Sensor Stuck (EBB)
  

Is DTC C0040-12 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
2.
Electric brake booster system DTC check:

Electric brake booster system DTC check
?1.
Check for electric brake booster system DTCs with the HDS.
DTC Description
DTC
Freeze Frame
C1C01-96 Brake Pedal Stroke Sensor Component Internal Failure
    
C1C02-12 Brake Pedal Stroke Sensor Signal Circuit 1 Short To Battery
    
C1C02-14 Brake Pedal Stroke Sensor Signal Circuit 1 Short To Ground or Open
    
C1C03-11 Brake Pedal Stroke Sensor Signal Circuit 2 Short To Ground
    
C1C03-15 Brake Pedal Stroke Sensor Signal Circuit 2 Short To Battery or Open
    
C1C04-11 Brake Pedal Stroke Sensor Power Circuit Short To Ground or Battery
    

Is DTC indicated?

     
YES
     
     
     
Go to indicated DTCs troubleshooting.?
     
NO
     
     
     
Go to step 3.
3.
Brake pedal/brake pedal position switch and electric brake booster check:

Brake pedal/brake pedal position switch and electric brake booster check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Inspect the brake pedal and brake pedal position switch.

?3.
Turn the vehicle to the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Turn the vehicle to the OFF (LOCK) mode, then start the engine.

?6.
Test-drive the vehicle under these conditions:
Vehicle speed at 9 mph (15 km/h) or more for at least 60 seconds
Accelerator pedal pressed
Brake pedal released

NOTE: Drive the vehicle on the road, not on a lift.

?7.
Check for DTCs with the HDS.
DTC Description
DTC
C0040-12 Brake Light Switch Failure (Stuck ON)/Brake Pedal Stroke Sensor Stuck (EBB)
  

Is DTC C0040-12 indicated?

     
YES
     
     
     
Check for loose terminals and poor connections in the electric brake booster 26P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric brake booster.?
     
NO
     
     
     
Troubleshooting is complete.?