got that same issue code DTC C1214 Solenoid Valve Relay Contact or Coil Circuit Open cant figure out what is going on Ill clean out my grounds before I proceed with anything else

 

Forgive me as I am a newbie!!!1

My car this morning when I was getting ready to leave came up with the following message: "Reduced Engine Power" & Traction Control Needs Services, I was like wtf.........?

Right after the codes came up, I turned the ignition off and took the key out of the Ignition and opened the door and closed it and tried again and no message, does that mean the code no longer exists or was it a fluke? I did today go out and follow the procedure to view the codes and reset them which I did and thereafter I took the car for a spin and it feels like its faster then it was before?

Just the night before I finished installing my HALLTECH Carbon Fiber TRIC Cold Air Intake, but right after the install I took the car for a spin and no CEL/DTC Came up?

 

Sometimes codes can be a fluke. Most of the time they indicate that something is wrong. You should have posted what codes you had and if they were C or H. Yes,,,clearing some DTC's will result in the effected system working again or a noticeable improvement in performance. A good one for not working correctly when a DTC is present is the HVAC system!!

If you had a CEL and then it vanished after restarting, that usually means that the error is usually in history.

BC

 

thanks bill for all your help in the past.I took my 2001 in to get the traction control fixed and they put on 1700$ worth of parts and it is still on . They replaced the ecm that bolts to the abs pump and then said i need the 1300$ abs pump also because some brake pressure valve is stuck is there a specific ground or a location for the grounds for this pump or module. I have went through my vett and cleaned the grounds through out the car. I am wondering if i may have a broken wire or something like that . If anyone could email or post the wiring schematic this would help.
the code is c1293 .and comes on when u get on the gass hard in 1st and then let off abruptly, letting the car slow its self and not hitting the brakesdoes anyone els have this problem. feel free to call or email roy at royjeep98@yahoo.com or call 270 234 3676 . ps if u have an after market warnity they will want to inspect this issue.

 

I had a Bonneville SSE that had a ABS light. Meant that the ABS/Traction Control has been disabled until the condition is corrected. Very soon afterwards, the right front wheel bearing hub started to growl. Replacing the wheel bearing hub corrected the ABS light also, so I think that wheel bearing ABS sensor was losing "counts" or mismatched to the other wheels as the bearing was going bad.

May not be the condition that you have, but I would at least check the condition of the connector to the wheel that has the problem.

 

Roy

A 1293 DTC indicates that you have a defective or malfunctioning stop lamp switch circuit. There are more than one switch in that switch so do not think that just because your tail lights work that the switch is good. The first thing to check in the circuit is:

STP/HAZ Mini fuse in the instrument panel fuse box in the passengers foot well behind the toe board. It will be a 20 AMP fuse. The switch will be on the brake pedal bracket. The wires that you are interested in are on plug C2 and they connect to pins A & B on the switch. The 12 VDC wire from the fuse box to the switch pin A is ORANGE. The wire from the switch pin B is LT Blu. The LT Blu wire goes to the EBTCM and connects to pin# 9.

You should be able to disconnect the main cam lock plug on the EBTCM, find pin# 9 and read that pin to ground. When you press the brake pedal, you should see 12 VDC.

Check that out and get back to me.

Bill

 

also got a 1296 code bill i will check it tonight thanks

 

Roy

You were who I replied to!!

If a dealer replaced all that stuff and charged you that much money, you should have gotten your car washed and vacuumed and the problem fixed! There shouldnt have any more DTC's for that system!!!!!!

Please let me know how you make out troubleshooting.

BC

 

A C1214 code is the EBCM (Electronic Brake Control Module, the electronic part of the ABS assembly. It is attached to the hydraulic part, the BPMV or Brake Pressure modulating Valve, which can also cause this code.) It could be the connector or a ground. It could also be the actual module. See this thread for more info http://forums.corvetteforum.com/show....php?t=1387486

 

Hey Bill....I, like many others, am getting multiple "service active handling" and other traction control related warnings. Can the corrosion on the connectors actually effect how the active handling/ABS functions? Sometimes my front brakes will quickly grab when I'm driving down the freeway. It doesn't happen long enough to cause an accident but there is definitely something wrong. Has anyone else experienced this? I guess I will just clean the connectors and see if it solves the problem. If that doesn't help I have a feeling it's going to be a very expensive problem to fix. Any feedback would be greatly appreciated.

 

Vince

I'm guessing that you have a 2000 or newer C5. Yes,,,,i have had this exact problem! The wife told me that it happened to her and i told her she was crazy! Then it happened to me! I wont live that on down !!

Your EBTCM is defective and will require replacement. You can try all of the simple basic stuff but in the long run, module replacement is required for that problem. If you read the codes, you most likely have the dreaded 1214 code.

There is an E Bay person that rebuilds the EBTCM and warranty is lifetime. They charge 450 for your EBTCM. Thats better than 700+ for a new DELPHI unit that can fail again soon!

Replace it your self. The dealer charged me "ready for this" $1600 to fix this problem! Lucky for me,,,I got GM to pay for the repair under warranty! I had to fight tooth and nail through GM Customer Assistance but they came through.

Replacing the module is easy!







BC

 

Bill.....thank you so much for the quick response!! Yes, I have a 2001 Z06.(I should have mentioned that ) I was hoping I could simply clean the connectors, but not too surprised that I have to replace that part. What is the name of the vendor who rebuilds this part? I know I'm preaching to the choir here, but GM really dropped the ball with this one. With so many owners having the same problem here, you'd think they'd step up and take care of it. This problem effects the driveability of the Z06, and isn't the driving experience the reason we all bought these cars?? Very disappointing. Again Bill, thanks very much for the help.

 

Vince

For the hell of it, call GM Custormer Assistance and talk to them. They have been very forgiving on this problem. See if they will do anything for you. Hell,,,,all they can say is we can help you. It might be worth $450-1600. Just make sure that they COVER the repairs with CASH. They gave me a $1600. GM new car voucher! Oh yea, I did use it on an 06 C6 Z51 Coupe.

BC

 

Row 1. 1 blank 2.tanw/black 3.green 4.blank 5.greenw/black 6.ltblue 7.blank 8.red 9.brown 10.dk green 11.lt blue 12.orange w/black 13.orange w/black 14.blank 15.blank


Row 2 .16.blank 17.black 18.lt blue 19.purple 20.blank 21.lt blue 22.black 23.white 24.tan 25. yellow 26.blank 27. gray 28.lt blue 29. blank


Bill does anyone have the correct pin out location for the EBCM my pin 9 is brownat the EBCM. The lt blue form the break switch is there and has power when the pedal is pushed . I am using a meter and i grounded the black lead and put the red in pin 9 brown and nothing. I need yoda's help on this one.

THIS IS MY PIN OUT DO NOT USE THIS ON ANY OTHER CAR I THINK MY WIRES ARE IN THE WRONG SPOTS

 

This is topic ABS and Traction Control 2001+ in forum Factory Five GTM Supercar at FFCobra Discussion Forums.




The 2001+ EBCM provides 5 functions.

Antilock Brake System (under braking if a wheel locks it reduce pressure to that caliper until wheel turns)

Traction Control (if one rear wheel rotates more than the other when the brakes are not being applied, reduces engine torque and possibly applies braking power to that wheel).

Dynamic Rear Proportioning (regulate rear brake pressure to balance braking effort between front and back).

Vehicle Stability Enhancement System (monitors steering wheel position and yaw and tries to correct for oversteer or understeer).

Rear Stability Control (monitors lateral acceleration and uses brake pressure to improve stability)


As others have suggested, VSES and RSC are programmed based on the Corvette and would probably be undesirable on the GTM give the differences in weigh and weight distribution. In addition it would be hard to retain the steering wheel position sensors. So I wanted to disable these functions, but retain the others.

Fortunately if the EBCM does not have its yaw, accelerometer or steering wheel position sensors connected, it throws a Diagnostic Trouble Code in the EBCM, and disables the functions that rely on these sensors, while leaving other functions in place.

So what follows are the electrical connections that I made for the ABS, TC and DRP functions. You will have to figure out where you want to locate the EBCM module, and run the front and rear brake cylinder lines into it, with 4 individual lines out for each wheel. You will also need the ABS sensors on each wheel, and the connection harness which links the wheel sensors to the EBCM.

The Corvette has a switch to turn off Traction Control but it worked through the Body Control Module, which I did not retain, so the only way I can turn off Traction Control is to disable the whole EBCM by interrupting its 12V ignition supply.

When looking into the ABS connector on the harness I have 7 heavy connectors, which are A thru G, reading right to left. There are also 29 pin connectors which are #1 at the top right, thru #15 at the end of the top row, and #16 thru #29 from right to left on the second row. “Not used” means that on the corvette it was not used. “Unused” means that it was used on the corvette, but is not needed now.

A RED Battery 12V, always on and at least 40 amp. I used the original ABS connector on the fusebox.

B BROWN Ignition 12V, and at least 10 amp. This can be put through a switch to disable the EBCM if desired.

C GREY Variable Effort Steering – Unused
D WHITE Variable Effor Steering – Unused
E Not Used
F BLACK/WHITE Ground
G BLACK Ground

1 Not used
2 TAN/BLACK Delivered Torque connects to C150 - E (see below)
3 LIGHT GREEN Steering position – Unused
4 Not used
5 LIGHT GREEN/BLACK Lateral Accelerometer – Unused
6 LIGHT BLUE Stop lamp supply voltage connects to stop lamp switch and gets 12V when stop lamp operates. It also carries 4-5 volts and low power when the switch is not depressed as a bulb check
7 Not used
8 RED Left rear wheel sensor
9 BROWN Right rear wheel sensor
10 DARK GREEN Right front wheel sensor
11 LIGHT BLUE Left front wheel sensor
12 ORANGE/BLACK Requested torque signal connects to C150 - D
13 ORANGE/BLACK low reference – ties in to brake pressure sensor and connected to ground
14-16 Not used
17 BLACK Brake pressure sensor signal from brake pressure sensor on EBCM
18 LIGHT BLUE Steering position – Unused
19 DARK BLUE Yaw rate sensor – Unused
20 Not used
21 LIGHT BLUE Class 2 serial data connect to C150 – M (same wire that FFR has you connect to the OBDII connector)
22 BLACK Left rear wheel sensor
23 WHITE Right rear wheel sensor
24 TAN Right front wheel sensor
25 YELLOW Left front wheel sensor
26 Not used
27 GREY steering position 5V reference – connect to brake pressure sensor on EBCM
28 LIGHT BLUE steering position – Unused
29 Not used.

There is a good chance that you do not need to connect 13, 17 and 27 since I think they pertain to VSE and RSC but in trying to get mine working, I connected them anyway.

The EBCM will have Diagnostic Trouble Codes (DTC’s) because of the sensors that are not connected. You will not be able to see these codes unless your OBDII scanner can access modules beyond the PCM. See my post on cruise control for the scanner setup I used. The codes I got are:

C1241 Magnasteer error
C1282 Yaw sensor error
C1284 Lateral acceleration error
C1285 Lateral acceleration error
C1287 Steering position error
C1288 Steering position error

These codes do not disable ABS or Traction Control. If you have other codes, you need to check them out.


For reference, this is what is at C150 on my harness.

A Red/black A/c Pressure signal
B Grey 5v reference
C Black A/c pressure ground
D Orange/black Traction control requested torque signal
E Tan/black. Traction control delivered torque signal
F-K not used
L Dark green/white VSS
M Dark green Serial data signal
N Dark green/white A/c request signal
P Dark green/white Engine oil temp input
R Black Ground
S Grey cruise control release signal from clutch
T Grey extended brake travel signal


Good luck!

 

Hey Everyone,

I am brand new to this forum and corvettes. First, thank you all for your great information. I just bought my first vette, a 1999 C5....a dream come true. It will no doubt not be my last.

No more than a day into driving it, I started it up to the service ABS and service traction displays. I'd turn off the car, restart it and it would be gone. This has happened 3 out of 20 starts or so. So I browsed all your valuable information, read about ground connections, EBCM, etc, and saw that I should look up the codes. Here's what I found:

28 TCS
C1221 H Wheel Speed Sensor Circuit
C1222 H
C1225 H
C1255 H
U1016 H Lost Communication with XXX
99 HVAC
B0367 H HVAC Actuator Feedback Circuit
A0 LDCM
B2282 H Battery 1 or Battery 2 Voltage Out of Range
B2284 H
U1255 H Lost Communication with XXX
U1064 H
U1016 H
U1096 H
A1 RDCM
B2283 H Battery 1 or Battery 2 Voltage Out of Range
U1255 H Lost Communication with XXX
U1064 H
U1016 H
U1096 H
A6 SCM
B0851 H Battery Out of Range
U1016 H Lost Communication with XXX
U1016 H
B0 RFA
U1255 H Lost Communication with XXX
U1096 H
U1064 H
U1016 H

I know this is probably it's complete history and who knows what has been fixed already by the previous owner, but does anything jump out as a red flag? I proceeded to clear the codes so I can see what shows up new if the ABS/Traction service comes on again. If it does reappear, does this usually wind up being the EBCM, or did I get lost in the treads and mess this up all together?

Thank you all again for passing on you vast knowledge to us newbies!!!

 

I use to have the service ABS /Traction control would flash up on my dash if I ever hit my hazard flashers while the car was driving. All I would have to do is restart the car and it would clear it from my dash and everything would work fine.

 

This stuff must be contagious. I got the C 1214 code yesterday and I can't clear it.
Plan A: I will try to clean the ground and connector today. Hope it works.
Plan B: I called Auto & Truck Electronics in West Palm and they will rebuild it with a 3 year warranty for $325. Their number is 800-257-3395.

 

Any code followed by an "H" is history (old).

Any code followed by a "C" is current (active problem).

 

Thanks for all the input. All of my codes are H, so I'll wait until it happens again and see if I get a new "C" code.

Thanks again!