Traction control and ABS issue
Thread Starter
7th Gear
Joined: Jul 2022
Posts: 7
Likes: 1
Traction control and ABS issue
Hello everyone,
I am having an issue on my base model c5 (2002) where at the beginning of my drive the traction control and ABS will kick in. The traction control will start just by going over 30 mph or when making turns. ABS will kick in at stop signs and lights. These things happen during regular driving; not doing any kind of competitive or fast driving. After kicking in a few times both will fail and the lights/indicators will come on telling me to service the ABS and traction control system. I pulled the codes off of the dash and got C1214 H, C1221 H, C1225 H, and C1232 H. There has been no wet weather (Central Texas in summer). Ive done some research and saw that alot of times these issues are caused by loose harnesses or EBCM. I will be looking at the Harnesses this weekend. My main concern is the fact that the systems try to kick in at unnecessary times, then just fail altogether. I am trying to sell it soon to get my hands on a c5 z06, I just dont think I can sell it in good conscious without traction control and ABS. Any help is appreciated.
I am having an issue on my base model c5 (2002) where at the beginning of my drive the traction control and ABS will kick in. The traction control will start just by going over 30 mph or when making turns. ABS will kick in at stop signs and lights. These things happen during regular driving; not doing any kind of competitive or fast driving. After kicking in a few times both will fail and the lights/indicators will come on telling me to service the ABS and traction control system. I pulled the codes off of the dash and got C1214 H, C1221 H, C1225 H, and C1232 H. There has been no wet weather (Central Texas in summer). Ive done some research and saw that alot of times these issues are caused by loose harnesses or EBCM. I will be looking at the Harnesses this weekend. My main concern is the fact that the systems try to kick in at unnecessary times, then just fail altogether. I am trying to sell it soon to get my hands on a c5 z06, I just dont think I can sell it in good conscious without traction control and ABS. Any help is appreciated.
Pro
Joined: Dec 2013
Posts: 627
Likes: 181
From: west coast of Canada
Here is some info on grounds... there were some pics with this but can't get them to copy Cleaning ground points:
My C5 has some 'random' codes and issues. I'll open up a thread on those later asking for advice on what to do. But before doing so, I decided to 'give something back' in return for the countless invaluable threads available on this amazing forum.
One of those threads was initiated by Bill Curlee and regards the cleaning of ground points, see here and here especially. That magnificent thread was a big help for me. Unfortunately cleaning the ground points did not have the desired effect till now (6 out of 13 points cleaned), but I comfort myself thinking that in doing so I'm preventing future issues.
Quick summary of Bill Curlee's thread: the C5 has 13 ground points. They can get corroded (especially those exposed to weather influences, such as in the engine compartment) causing seemingly random DIC codes to appear. It's a good idea to clean them.
As my C5 had 25 DIC's and a few other malfunctions, it seemed like a good idea to indeed search all ground points and to clean them. Here's my report, perhaps handy for another C5-owner with electrical issues. Online I didn't find the exact (photographed) locations of all points and some are not easy to find. This thread hopes to serve as illustration in addition to Bill Curlee's thread.
The first four points are easy to find, are all in the engine compartment. The other ones are a bit trickier to find.
1. First one: near left front wheel at headlight, on the beam from headlight abaft.
2. First thing to notice is that the connection point between frame and ground point is quite rusty.
3. As Bill explained in the referred thread, the black connector can be opened. Top as well as bottom, there are latches (on the previous photo such a latch is indicated by a blue arrow). It's best to use a small flat screwdriver to lift the plastic over the latch (first one side, then same procedure other side). The metal ground tong is best grabbed with a pair of vise grips.
The males are quite corroded:
4. As are the females, even though that can not be seen as clearly:
5. Here the left three contacts were cleaned up (Proxxon multitool with steelbrush) :
6. Contacts are clean:
7. Everything clean:
8. When you use a pointy grinder on your Proxxon or Dremel or other multitool, it's possible to clean the inside of the connector. On the next pic all 'females' were cleaned except for one:
9. Clean!
10. Next, inject a bit of WD40 into the connector. .
Next ground point is situated on the other side, same spot.
11. First ground is numbered G101, second G102. I hope Bill will allow me to use his picture of the shop manual for reference purposes.
12. Underneath the brake servo ground G103 is situated. That's no connector type but a simpler single ring-type.
13. Meanwhile I found a souvenir underneath the engine block.
14. Looking for points 11 and 12 but have not yet found them...
15. Also I've been looking for ground points in the trunk compartment but also there I found nothing (yet). Underneath the back carpet (that normally will never be removed) I discovered this relic:
Right.
16. Near the battery there is an important ground point. It can get corroded and is a high-influence spot. In my car it looked like this:
17. Quite nasty.
18. After cleaning it seems to have been made of copper.
19. Also another ground point is situated here.
21. Fourth point is clean!
22. To be able to reach the next contact point (in door pillar at drivers side), a couple of things need to be removed. First the seatbelt needs to be unscrewed. A dark-coloured cover needs to be unscrewed (hex key + pin), after which two (in my car tan) plastic caps need to be removed. This was done by mild force.
23. There's the ground point numbered G301 (ring type). It looked great and cleaning it up made little difference.
24. At passenger side, reaching the ground point was harder because moving the passenger seat was not possible (power seat doesn't currently function) AND there's a screw present in one of the covers. Ground can be reached nonetheless. This is a connector-type ground point. Like on driver side, I found it in good condition.
To be continued...
You are doing an OUTSTANDING job on the chassis ground cleaning. Here are some more points for you to check.
G-106 Above the Starter on the block:
G-107 Back of the drivers side cylinder head (head removed for MODs) :
G-105 Look at the block between cylinders 5 & 7 and you will see the head of the bolt for G-105 Its in the exact same place as G-106 is on the passengers side...
G-201 & 202 If you pull off the door sill cover and look at the area where the A Pillar meets the frame, you will find 201 and 202 Again, there mirror locations like 90% of the chassis grounds are:
G-401 and G-402 G-402 is only used if you have a rear mounted EBTCM (97 & early 98 C5s) The stud is still there for 402 if it is not used. Look between the drivers rear tire and the rear part of the tub on the inside of the frame for G-401 :
Yours will be a STUD. Mine broke off and I replaced it with a self tapping screw.
Last edited by Bill Curlee; 06-12-2015 at 06:23 PM.
LOL!! Just wait till you get into cleaning the Splice Packs!!!
They are ALL OVER THE PLACE!!
Heres a jucy example of a acid damaged one!!
Here’s what a splice pack looks like:
I used this product and it seems to work very well. There’s a thick film and a thin film version.
CORROSION X
My C5 has some 'random' codes and issues. I'll open up a thread on those later asking for advice on what to do. But before doing so, I decided to 'give something back' in return for the countless invaluable threads available on this amazing forum.
One of those threads was initiated by Bill Curlee and regards the cleaning of ground points, see here and here especially. That magnificent thread was a big help for me. Unfortunately cleaning the ground points did not have the desired effect till now (6 out of 13 points cleaned), but I comfort myself thinking that in doing so I'm preventing future issues.
Quick summary of Bill Curlee's thread: the C5 has 13 ground points. They can get corroded (especially those exposed to weather influences, such as in the engine compartment) causing seemingly random DIC codes to appear. It's a good idea to clean them.
As my C5 had 25 DIC's and a few other malfunctions, it seemed like a good idea to indeed search all ground points and to clean them. Here's my report, perhaps handy for another C5-owner with electrical issues. Online I didn't find the exact (photographed) locations of all points and some are not easy to find. This thread hopes to serve as illustration in addition to Bill Curlee's thread.
The first four points are easy to find, are all in the engine compartment. The other ones are a bit trickier to find.
1. First one: near left front wheel at headlight, on the beam from headlight abaft.
2. First thing to notice is that the connection point between frame and ground point is quite rusty.
3. As Bill explained in the referred thread, the black connector can be opened. Top as well as bottom, there are latches (on the previous photo such a latch is indicated by a blue arrow). It's best to use a small flat screwdriver to lift the plastic over the latch (first one side, then same procedure other side). The metal ground tong is best grabbed with a pair of vise grips.
The males are quite corroded:
4. As are the females, even though that can not be seen as clearly:
5. Here the left three contacts were cleaned up (Proxxon multitool with steelbrush) :
6. Contacts are clean:
7. Everything clean:
8. When you use a pointy grinder on your Proxxon or Dremel or other multitool, it's possible to clean the inside of the connector. On the next pic all 'females' were cleaned except for one:
9. Clean!
10. Next, inject a bit of WD40 into the connector. .
Next ground point is situated on the other side, same spot.
11. First ground is numbered G101, second G102. I hope Bill will allow me to use his picture of the shop manual for reference purposes.
12. Underneath the brake servo ground G103 is situated. That's no connector type but a simpler single ring-type.
13. Meanwhile I found a souvenir underneath the engine block.
14. Looking for points 11 and 12 but have not yet found them...
15. Also I've been looking for ground points in the trunk compartment but also there I found nothing (yet). Underneath the back carpet (that normally will never be removed) I discovered this relic:
Right.
16. Near the battery there is an important ground point. It can get corroded and is a high-influence spot. In my car it looked like this:
17. Quite nasty.
18. After cleaning it seems to have been made of copper.
19. Also another ground point is situated here.
21. Fourth point is clean!
22. To be able to reach the next contact point (in door pillar at drivers side), a couple of things need to be removed. First the seatbelt needs to be unscrewed. A dark-coloured cover needs to be unscrewed (hex key + pin), after which two (in my car tan) plastic caps need to be removed. This was done by mild force.
23. There's the ground point numbered G301 (ring type). It looked great and cleaning it up made little difference.
24. At passenger side, reaching the ground point was harder because moving the passenger seat was not possible (power seat doesn't currently function) AND there's a screw present in one of the covers. Ground can be reached nonetheless. This is a connector-type ground point. Like on driver side, I found it in good condition.
To be continued...
You are doing an OUTSTANDING job on the chassis ground cleaning. Here are some more points for you to check.
G-106 Above the Starter on the block:
G-107 Back of the drivers side cylinder head (head removed for MODs) :
G-105 Look at the block between cylinders 5 & 7 and you will see the head of the bolt for G-105 Its in the exact same place as G-106 is on the passengers side...
G-201 & 202 If you pull off the door sill cover and look at the area where the A Pillar meets the frame, you will find 201 and 202 Again, there mirror locations like 90% of the chassis grounds are:
G-401 and G-402 G-402 is only used if you have a rear mounted EBTCM (97 & early 98 C5s) The stud is still there for 402 if it is not used. Look between the drivers rear tire and the rear part of the tub on the inside of the frame for G-401 :
Yours will be a STUD. Mine broke off and I replaced it with a self tapping screw.
Last edited by Bill Curlee; 06-12-2015 at 06:23 PM.
LOL!! Just wait till you get into cleaning the Splice Packs!!!
They are ALL OVER THE PLACE!!
Heres a jucy example of a acid damaged one!!
Here’s what a splice pack looks like:
I used this product and it seems to work very well. There’s a thick film and a thin film version.
CORROSION X
Pro
Joined: Dec 2013
Posts: 627
Likes: 181
From: west coast of Canada
more on groundsengine ground strap top left frame behind left front wheel well
G101 left front frame (with SP101)
G102 right front frame (with SP100)
G103 left front of engine
G104 frame next to battery (with G108 & SP102)
G105 left lower engine block, engine ground strap & wire
G106 Battery negative pole
G107 Left rear head
G108 frame next to battery (with G104)
G201 bottom of A-pillar, left (with SP201 & SP203)
G202 bottom of A-pillar, rt, bolted at the bottom (with SP202)
G205 inside door pillar driver seat (with G301)
G301 inside door pillar passenger seat
G302 inside door pillar driver seat (with G205)
G401 left rear outer frame
G402 right rear inner frame
SP201 bottom of A-pillar, left (bolted with G201)
SP202 bottom if A-pillar, rt (bolted to G202)
SP203 bottom of A-pillar, left (taped to wire bundle, with G201 coming out of it)
G101: windshield washer fluid pump
Windshield washer fluid level switch
Brake fluid switch
Headlamp door assembly, left
G102: cooling fan, right
Cooling fan 3 relay 44
Horn assembly
Underhood lamp
Headlamp door assembly, right
Headlamp door control module
A/c compressor clutch
A/c compressor clutch diode
Secondary air injection pump
G103: Electronic brake control module (ebcm)
G104: battery negative pole
Splice pack SP102:
Marker lamp, right front
Marker lamp, left front
Park/turn signal lamp, right front
Park/turn signal lamp, left front
Turn signal lamp, right front
Turn signal lamp, left front
Splice pack SP208:
Body control module (bcm)
Instrument panel cluster (ipc)
Data link connector (dlc)
Inflatable restraint & diagnosis module
Inflatable restraint ip module disable switch
Park/neutral switch
Remote control door lock receiver
G105: fuel pump relay 35
Engine oil level switch
Heater O2 sensor, bank 1 sensor 1
Heater O2 sensor, bank 1 sensor 2
Heater O2 sensor, bank 2, sensor 1
Heater O2 sensor, bank 2, sensor 2
G106: battery negative pole
Ignition relay 42
Powertrain control modules (pcm, 4 wires)
Throttle actuator control module (tac)
Mass airflow sensor (maf)
G107: ignition control modules 1-3-5-7
Ignition control modules 2-4-6-8
G108: Electronic brake control module (ebcm)
G201: Splice pack SP201:
Data link connector (dlc)
Air temperature actuator
Instrument panel cluster (ipc)
Traction/suspension control switch
Driver door module (ddm)
Door latch, driver
Auxiliary power outlet
Windshield wiper motor
Steering column lock
Footwell courtesy lamp, left
Instrument panel cluster (ipc)
Hazard switch
Telescopic actuator switch
Splice pack SP203:
Remote CD changer
Fuse block I/P
Speaker, right door
Speaker, left door
Radio
G202: Splice pack SP202:
Passenger door module (pdm)
Door latch, passenger side
Body control module (bcm)
HVAC control module
IP compartment lamp
Footwell courtesy lamp, right
Vanity mirror lamp, left
Vanity mirror lamp, right
Inside rearview mirror
Bose relay 45
Ignition switch
Blower motor relay c60
Blower motor control processor
Hood ajar switch
Cigar lighter
A/t shift lock control solenoid
G205: seat belt switch, driver
Seat control module (scm), driver
Seat pump, driver
Seat belt switch, driver
Seat relay center, driver
G301: defogger grid
G302: Splice pack SP302:
Seat relay center, passenger
Seat pump, passenger
Rear compartment courtesy lamp, right
Rear compartment courtesy lamp, left
Rear compartment lid latch
Rear compartment lid latch, right
Rear compartment lid latch, left
Folding top lid latch
Folding top release switch
Fuel door lock actuator
Radio power antenna
G401: Splice pack SP400:
Fuel pump & sender assembly, left
Fuel level sender, right
Tail, stop, turn signal, rear left
Tail, stop, turn signal, rear right
Center high mounted stop lamp
Backup lamp, right
Backup lamp, left
License lamp, right rear
License lamp, left rear
Marker lamp, left rear
Marker lamp, right rear
G402 electronic suspension control module (esc)
_
[img]file:///C:/Users/Mark/AppData/Local/Temp/msohtmlclip1/01/clip_image001.gif[/img][img]file:///C:/Users/Mark/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif[/img]
G101 left front frame (with SP101)
G102 right front frame (with SP100)
G103 left front of engine
G104 frame next to battery (with G108 & SP102)
G105 left lower engine block, engine ground strap & wire
G106 Battery negative pole
G107 Left rear head
G108 frame next to battery (with G104)
G201 bottom of A-pillar, left (with SP201 & SP203)
G202 bottom of A-pillar, rt, bolted at the bottom (with SP202)
G205 inside door pillar driver seat (with G301)
G301 inside door pillar passenger seat
G302 inside door pillar driver seat (with G205)
G401 left rear outer frame
G402 right rear inner frame
SP201 bottom of A-pillar, left (bolted with G201)
SP202 bottom if A-pillar, rt (bolted to G202)
SP203 bottom of A-pillar, left (taped to wire bundle, with G201 coming out of it)
G101: windshield washer fluid pump
Windshield washer fluid level switch
Brake fluid switch
Headlamp door assembly, left
G102: cooling fan, right
Cooling fan 3 relay 44
Horn assembly
Underhood lamp
Headlamp door assembly, right
Headlamp door control module
A/c compressor clutch
A/c compressor clutch diode
Secondary air injection pump
G103: Electronic brake control module (ebcm)
G104: battery negative pole
Splice pack SP102:
Marker lamp, right front
Marker lamp, left front
Park/turn signal lamp, right front
Park/turn signal lamp, left front
Turn signal lamp, right front
Turn signal lamp, left front
Splice pack SP208:
Body control module (bcm)
Instrument panel cluster (ipc)
Data link connector (dlc)
Inflatable restraint & diagnosis module
Inflatable restraint ip module disable switch
Park/neutral switch
Remote control door lock receiver
G105: fuel pump relay 35
Engine oil level switch
Heater O2 sensor, bank 1 sensor 1
Heater O2 sensor, bank 1 sensor 2
Heater O2 sensor, bank 2, sensor 1
Heater O2 sensor, bank 2, sensor 2
G106: battery negative pole
Ignition relay 42
Powertrain control modules (pcm, 4 wires)
Throttle actuator control module (tac)
Mass airflow sensor (maf)
G107: ignition control modules 1-3-5-7
Ignition control modules 2-4-6-8
G108: Electronic brake control module (ebcm)
G201: Splice pack SP201:
Data link connector (dlc)
Air temperature actuator
Instrument panel cluster (ipc)
Traction/suspension control switch
Driver door module (ddm)
Door latch, driver
Auxiliary power outlet
Windshield wiper motor
Steering column lock
Footwell courtesy lamp, left
Instrument panel cluster (ipc)
Hazard switch
Telescopic actuator switch
Splice pack SP203:
Remote CD changer
Fuse block I/P
Speaker, right door
Speaker, left door
Radio
G202: Splice pack SP202:
Passenger door module (pdm)
Door latch, passenger side
Body control module (bcm)
HVAC control module
IP compartment lamp
Footwell courtesy lamp, right
Vanity mirror lamp, left
Vanity mirror lamp, right
Inside rearview mirror
Bose relay 45
Ignition switch
Blower motor relay c60
Blower motor control processor
Hood ajar switch
Cigar lighter
A/t shift lock control solenoid
G205: seat belt switch, driver
Seat control module (scm), driver
Seat pump, driver
Seat belt switch, driver
Seat relay center, driver
G301: defogger grid
G302: Splice pack SP302:
Seat relay center, passenger
Seat pump, passenger
Rear compartment courtesy lamp, right
Rear compartment courtesy lamp, left
Rear compartment lid latch
Rear compartment lid latch, right
Rear compartment lid latch, left
Folding top lid latch
Folding top release switch
Fuel door lock actuator
Radio power antenna
G401: Splice pack SP400:
Fuel pump & sender assembly, left
Fuel level sender, right
Tail, stop, turn signal, rear left
Tail, stop, turn signal, rear right
Center high mounted stop lamp
Backup lamp, right
Backup lamp, left
License lamp, right rear
License lamp, left rear
Marker lamp, left rear
Marker lamp, right rear
G402 electronic suspension control module (esc)
_
[img]file:///C:/Users/Mark/AppData/Local/Temp/msohtmlclip1/01/clip_image001.gif[/img][img]file:///C:/Users/Mark/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif[/img]
Pro
Joined: Oct 2006
Posts: 515
Likes: 133
C1214 is a common fault and is a relay inside the ECBM. Did it go away on its own? Don't be surprised if it comes back. Don't think the harness would have anything to do with it.
