Pontiac Grand Prix Forums : Grandprix
 

Grand Prix Forums is the premier Pontiac Forum on the internet. Registered Users do not see the above ads. Please Register - It's Free!

Pontiac Grand Prix Forum - Welcome Register today! Contact us!

Results 1 to 11 of 11
  1. #1
    Donating Users industrialfish's Avatar
    Join Date
    Oct 2011
    Location
    Toledo, OH
    Posts
    1,277
    Chats
    956

    Default P0703 Brake Switch B Input Circuit.

    2005 GTP, getting ONLY this code (other than my constant P0420 catalytic code) and my cruise control is intermittent.

    This code seems to be a different cause and solution for every make and model so teh interweb hasn't been very helpful for this specific vehicle.

    The brake pedal switch is cheap and easy to replace if that is indeed the problem, but it could be the sensor on the master cylinder = $ or the TCC = $$$ or any harnesses in between, so anything else I will just dealership it since I've got like 800 miles left in the warranty, but I wanted to hear from you guys first if anyone has any specific info or firsthand knowledge.

    -Matt
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset

  2. #2
    Donating Users industrialfish's Avatar
    Join Date
    Oct 2011
    Location
    Toledo, OH
    Posts
    1,277
    Chats
    956

    Default Re: P0703 Brake Switch B Input Circuit.

    Damn, nobody has any input?
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset

  3. #3
    SE Level Member
    Join Date
    Mar 2014
    Location
    United States
    Posts
    4
    Chats
    0

    Default Re: P0703 Brake Switch B Input Circuit.

    A '05 GTP here too. I thing I may be having the same issue also. I have not checked for a code. Did you you get any kind of check engine light or any thing like that? Mine is surging 100 to 200 rpm cruising at speed, doesnt do it all the time and does seem to stop when you tap the brakes. I have reset the PCM just to see if that was the issue, and no joy there. I do have to agree it is tough to get info for this vehicle. Have you done any thing to correct yours yet?

  4. #4
    Donating Users industrialfish's Avatar
    Join Date
    Oct 2011
    Location
    Toledo, OH
    Posts
    1,277
    Chats
    956

    Default Re: P0703 Brake Switch B Input Circuit.

    My check engine light comes on frequently due to the catalytic issue I have, so I have no idea if the P0703 is setting the light or just storing the code in the computer. Although when I clear my cat code, the brake code isn't always there so I know it's not throwing it all the time.

    When it gets warmer, maybe this weekend, I'll be able to fix the problem causing the cat code so I'll be able to narrow down if the brake code is matching any symptoms I feel when driving.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset

  5. #5
    SE Level Member
    Join Date
    Mar 2014
    Location
    United States
    Posts
    4
    Chats
    0

    Default Re: P0703 Brake Switch B Input Circuit.

    OK, yea I have no ck eng light. So wouldnt have any idea if I was getting a code unless I had it checked. My issue seems to be not so noticeable in the morning first thing but when i get in later on it really acts up. Ill keep an eye on here, let me know what happens on your end. I may just go ahead and get a new brake switch and see what happens. A low cost job and may do it. LOL I just noticed that yours is the same color and wheel style.

  6. #6
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    37,756
    Chats
    157562

    Default Re: P0703 Brake Switch B Input Circuit.

    you guys got working brake lights? or they work, dont work deal? if so id change the brake switch on the brake pedal. or make sure its in place right and the wires are ok.

    ford explorers have a messed up brake switch that would fall apart, then it would also not let the car out of park, or have brake lights. that god they made a replacement switch for that pos.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  7. #7
    SE Level Member
    Join Date
    Mar 2014
    Location
    United States
    Posts
    4
    Chats
    0

    Default Re: P0703 Brake Switch B Input Circuit.

    Yes the brake lights work, but from my understanding of the switch, it has separate contacts for lights and CCT.

  8. #8
    SE Level Member
    Join Date
    Mar 2014
    Location
    United States
    Posts
    4
    Chats
    0

    Default Re: P0703 Brake Switch B Input Circuit.

    Ok, replaced the brake switch and so far seems to have fixed the problem. Drives like a different car. And every thing works as it should. No surging. Will keep you posted!

  9. #9
    Donating Users industrialfish's Avatar
    Join Date
    Oct 2011
    Location
    Toledo, OH
    Posts
    1,277
    Chats
    956

    Default Re: P0703 Brake Switch B Input Circuit.

    Quote Originally Posted by rgwog View Post
    Ok, replaced the brake switch and so far seems to have fixed the problem. Drives like a different car. And every thing works as it should. No surging. Will keep you posted!
    Long time update. I never saw this reply until I googled the code again and this thread was top of the results. I had no idea our brake light switch is ALSO a brake pedal position sensor. Ordered a new one so lets see if that fixes this code (which I still have).
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset

  10. #10
    GTP Level Member
    Join Date
    Jun 2016
    Location
    Cleveland ohio
    Posts
    664
    Chats
    124

    Default Re: P0703 Brake Switch B Input Circuit.

    I know this is an old thread but did the brake switch fix your problem Industrial Fish?
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, DIY ported heads, 90# springs, rollmaster single timing chain, fuel pump rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  11. #11
    Donating Users industrialfish's Avatar
    Join Date
    Oct 2011
    Location
    Toledo, OH
    Posts
    1,277
    Chats
    956

    Default Re: P0703 Brake Switch B Input Circuit.

    I haven't put it in yet... It stopped throwing the code when I put a new PCM in but I'm still getting the same symptoms. I think I'll put the switch in this week when it's not raining.

Similar Threads

  1. C0161 ABS/TCS brake circuit system failure ????
    By 1SLOW38 in forum General Tech Discussion
    Replies: 1
    Last Post: 03-15-2014, 11:21 AM
  2. Help p2535 ignition switch run/start position circuit high
    By Jsdorman5 in forum General Tech Discussion
    Replies: 1
    Last Post: 10-05-2013, 08:02 PM
  3. need some input input input.(short circuit)
    By IR II IP IDEATH in forum 5.3L V8 (LS4)
    Replies: 8
    Last Post: 02-17-2010, 03:23 AM
  4. P0102: Mass or Volume Air Flow Circuit Low Input
    By anicolay in forum General Tech Discussion
    Replies: 4
    Last Post: 04-30-2009, 01:59 PM
  5. P1810 Trouble Code - TFP Valve Position Switch Circuit
    By DanGTP in forum 1997-2007 4 speed Automatic (4T65E) (4T65E-HD)
    Replies: 1
    Last Post: 07-20-2008, 12:03 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •