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Thread: ABS and Traction control lights after bumps in the road.

  1. #1
    Join Date
    Dec 2016
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    Jennings, La. USA
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    Default ABS and Traction control lights after bumps in the road.

    3 weeks into this '03 Coupe w/100K miles on it and the lights started showing once in awhile after parking in a tight area, rocking the car too hard or a bad section of road. Also disconnecting the battery it shows these codes when first start up. 28 TCS C1214H and 60 IPC B 0516 H. I clear them and start the car an all codes stay off for my whole trip ( unless I hit some rough road sections ). I can pull off the road , shut all down, pull the key, open the door to stop the auto timer, then , start the car and no lights.
    Thinking it's a bad connection at one of the ground points are abs connects at the wheels. So, probably tomorrow, I'll start with the wheels , since I want to do some cleaning and inspections there , unplug the connectors, electro clean, wire brush and dielectric grease to seal up things going back together.
    Next will come the electric grounds I can find. Take them apart and do the same. Hoping that will solve the problem.
    Anyone have this problem and found the cure?

  2. #2
    Join Date
    Dec 2011
    Location
    Southern California
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    804

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    You are on the right track. But IPC is instrument panel cluster.

    2004 Z06/Z16 Stock motor, very modified suspension

    1996 Black/gray LT4 Coupe (sold)

    2007 328i (traded), 2004 IS300, 1995 M3 (sold), Chevy & Ford & Lexus SUV's.

    '06,'09,'10,'11,'12,'13,'16 SCCA Regional Solo Champion

    Visit my DIY video channel for tips. Click below.

    http://www.youtube.com/user/1947froggy?feature=guide

  3. #3
    Join Date
    Jul 2016
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    If you are going to check the wheel speed sensor connectors it is recommended that you look at the pins with a magnifying glass. If you see any corrosion, usually very little green specs then replacement is required.
    You can clean them but the damage is done!
    If your car saw rain then corrosion can be a problem.



    Sent from my SM-N920P using Tapatalk

  4. #4
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    Dec 2016
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    Jennings, La. USA
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    Didn't have a good mag glass but did check with a good light and two sets of glasses. All looked pretty clean. Sprayed them with CRC 2-29, blew it dry and sealed with dielectric grease. So far , so good.

  5. #5
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    Dec 2016
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    Jennings, La. USA
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    Well! Two front wheels done. Electrics for wheel speed cleaned and lubed. Inside of wheels cleaned. Break time and then the Backs. Gotta drive the car up on some 2 x 8's to get enough height for the jacking puck and floor jack to fit under Da Car. Such is life shaa! Even using the pressure washer, soap and stiff brush to clean old dirt and brake dust from the parts under there. ;-) Did find one clip pretty loose so fixed that up. Thanks to Froggy for that tip. For sure having fun with this project.

  6. #6
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    Dec 2016
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    Jennings, La. USA
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    All 4 wheels done. Still getting the ABS/Traction control light on after bumps. Drive it about 4 or 5 miles on some good roads, stop car, turn off, pull key, let the dash quit flashing stuff, restart, no lights the rest of the 20 miles to home. Didn't have the lights come on when jacking and letting the 4 tires down. Back over a 2 in dam I have at the front of the garage which is a fair bounce. Get back in the car an hour later to go get gas and check out the work, Sigh! ABS/Traction Control lights there to greet me. Filled up the car about 1.5 miles from home (love the 23.5 mpg in mixed driving with ac on most of time ) , start car and still have lights. Do about a 10 mile run on back roads, shut it down, restart, no lights.
    Tomorrow, start chasing grounding points starting with the front of the car. Later or sooner, gonna find it. By the way, Check for codes when getting home and only one showing was TCS C 1214H. Gonna start with that puppies ground first.

  7. #7
    Join Date
    Dec 2011
    Location
    Clever, MO
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    I once had some similar issues that I researched and fixed eventually. Please read my "sticky" on the home page of this C5 Forum.....Sticky: Ignition replaced.....dtc's and electrical issue are finally gone!!

    This may give you some incite on your issue.
    Good luck.
    Dennis

    Dennis "Fix" Fixsen dba FixVet Detailing Services, Clever, MO
    1998 Black over Torch Red Coupe, A4, F45, 3.15 rear, HP Tune, CAI, Vararam Velocity Stack, Z06 TI Catbacks, drilled/slotted rotors....VFW Life Member, VN Vet 70-71, 4thINF & 101stABN

  8. #8
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    When you check the connections, even if they look clean be sure to check that the female part has not "spread it's legs" so as to make a loose intermittent connection. You need to look really close even with a magnifying glass.



    I have videos on doing the grounds.
    2004 Z06/Z16 Stock motor, very modified suspension

    1996 Black/gray LT4 Coupe (sold)

    2007 328i (traded), 2004 IS300, 1995 M3 (sold), Chevy & Ford & Lexus SUV's.

    '06,'09,'10,'11,'12,'13,'16 SCCA Regional Solo Champion

    Visit my DIY video channel for tips. Click below.

    http://www.youtube.com/user/1947froggy?feature=guide

  9. #9
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    Washington State
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    Quote Originally Posted by froggy47 View Post
    When you check the connections, even if they look clean be sure to check that the female part has not "spread it's legs" so as to make a loose intermittent connection. You need to look really close even with a magnifying glass.



    I have videos on doing the grounds.

    Even with a magnifying glass you cannot tell the integrity of the connector unless it is really deformed. The only way to know for sure is a "pin fit" or "drag" test with a known good male connector, or the correct tool made for the job.
    20+ years ASE and Honda Master Tech

    1998 black 6 spd convertible

  10. #10

    Default

    Quote Originally Posted by froggy47 View Post
    When you check the connections, even if they look clean be sure to check that the female part has not "spread it's legs" so as to make a loose intermittent connection. You need to look really close even with a magnifying glass.



    I have videos on doing the grounds.
    Where can I find the videos you mentioned?

    Sent from my SAMSUNG-SM-N910A using Tapatalk

  11. #11
    Join Date
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    Location
    Southern California
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    The link is in my signature area, look down.

    2004 Z06/Z16 Stock motor, very modified suspension

    1996 Black/gray LT4 Coupe (sold)

    2007 328i (traded), 2004 IS300, 1995 M3 (sold), Chevy & Ford & Lexus SUV's.

    '06,'09,'10,'11,'12,'13,'16 SCCA Regional Solo Champion

    Visit my DIY video channel for tips. Click below.

    http://www.youtube.com/user/1947froggy?feature=guide

  12. #12
    Join Date
    Dec 2016
    Location
    Jennings, La. USA
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    All 3 grounds under the hood I took apart and cleaned and put a light coat of dielectric grease on. Next is finding the ground for the ABS / Traction unit when I jack the car up in a few days. Just had the side windows re-tinted today so gonna let all rest for 3 days so they cure proper.
    The section on the C1214 in the factory manual is like WOW. Has you checking for an open circuit on the solenoids in that unit. Checking resistance on the pins. I read a deal with the ground to the unit was the problem on his unit. Another had a bad connection on the key switch and replaced it to correct. So, just doing one step at a time. The lights were on when started the car this morning to get it to the shop for the window work. Was on when I left the shop and did a ride about on a country road. Stop at a stop sign, shut the engine off, pull the key, reset all the display readings, open and close the door to finish shutting all down. Close the door , pushed the key in and started it right away. No lights. Clean dash. Drove the 15 miles home and backed it in the garage. All working as should. This time. But, never know about the next start up. Might be a lite up dash, might not. But, I'm learning lots about this 03 C5 Coupe for sure. ;-)

  13. #13
    Join Date
    Jun 2017
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    4

    Default

    Check all components from clutch back. axles, sway bars, control arms etc.



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