DTC 41 - Brake Switch Circuit Fault - "P" Series: Notes

The TCC normally closed brake switch supplies a battery voltage signal on the TCC brake switch signal circuit to the PCM. The circuit is open when the brakes are applied. The brake light/cruise control normally open brake switch supplies a battery voltage signal on the cruise control/brake switch signal circuit to the PCM when the brakes are applied. DTC 41 will set when:

• Switches disagree for 10 consecutive minutes.

Or

• TCC and cruise control brake switches are not toggling open and closed, during 6 brake applications on same ignition cycle.

PCM will default to an incorrect brake signal can affect TCC, 4th gear operation, in hot mode and cruise control.

1. This step checks for voltage at brake switch.
2. This step simulates brake switch closed or brakes off.
3. This step checks for ignition feed to TCC brake switch.
4. This step checks the TCC brake switch signal circuit and simulates brakes being applied.