Possibly a bad brake light switch.Do you have a multimeter to do some testing?Or you could have a bad ground?

Answered by saturntech9 (expert)
23,156 answers provided

Just a quick question, Is the high mount, 3rd brake light working? That would make a difference.

Answered by Wrenchtech (expert)
14,716 answers provided

@saturntech9:How can I do testing of the brake switch?
@Wrenchtech : the 3rd light is not working, a few months ago the shift lever stuck in "Parking" even though I was pushing down on the brake pedal. Now I have to press the shift lock override switch to shift out of ""Parking".However the brake lights not turning on started only a few days ago.

Response from marta.meaux
1 question asked

Those are both strong indications of a brake light switch problem so follow Saturntech9's advice.

Answered by Wrenchtech (expert)
14,716 answers provided

Alright under the dash just bellow the brake pedal you will find the brake switch.The green wire with a black stripe should have power to it.Then when stepping on the brake the green wire with a white stripe should have power.

Answered by saturntech9 (expert)
23,156 answers provided

Does the green and white striped wire has power?

Answered by rasmataz
68 questions asked

When stepping on the brake that wire will have power.

Answered by saturntech9 (expert)
23,156 answers provided