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Old Apr 11, 2015 | 12:11 AM
  #1  
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Default C1242 code

Hey guys, I have done a thorough search and found that this horse has been beaten just about dead, however nothing that I have found has provided me a solution. So far I have tried:

- Applied power directly to the BPMV to run it. It runs normally, so the motor itself seems fine.

- Measured 1.8 ohms on the ground circuit between pin G on the EBCM connector and the negative side of the battery (also, the connection pins looked fine, no corrosion, not bent, etc.), therefore this does not appear to be a grounding issue.

- Measured 12 volts on the power wire to the connector at the EBCM.

- After doing the above I cleared the DTC codes, only to have C1242 return within about a second or two.

I have seen that some have said that sending the EBCM to ABSFixer. If this would fix my issue, wouldn't I have a C1214 code?
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Old Apr 12, 2015 | 08:26 AM
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Your problem is in the EBCM. It has a control relay in there to ground the motor circuit. The motor is not being grounded to run when requested.
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Old Apr 12, 2015 | 03:12 PM
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Thank you! I have ordered the replacement relay to solder into the circuit board.

Any idea why I'm not getting the code c1214 that most people get?
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Old Apr 12, 2015 | 04:50 PM
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[]
How does one clear the codes on a C5? does just unhooking the battery do it? thanks rj
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Old Apr 13, 2015 | 07:15 AM
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Originally Posted by Z06Luke
Thank you! I have ordered the replacement relay to solder into the circuit board.

Any idea why I'm not getting the code c1214 that most people get?

A C1214 might not affect the Ground. Where did you get the relay information to order?
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Old Apr 13, 2015 | 07:46 AM
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Originally Posted by redjetty
[]
How does one clear the codes on a C5? does just unhooking the battery do it? thanks rj
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Old Apr 13, 2015 | 03:17 PM
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Originally Posted by dadaroo
A C1214 might not affect the Ground. Where did you get the relay information to order?
I purchased the relay specified in this thread:

https://www.corvetteforum.com/forums...r-fleabay.html
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Old Apr 14, 2015 | 07:03 AM
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Thanks, I had seen that before. I don't know if that is also the motor grounding relay but it could be.
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Old Apr 19, 2015 | 07:09 PM
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I fixed the C1242 code, and it wasn't the relay. I replaced the relay and the issue did not go away, so I decided to do some more investigating and tracing circuits out with my multi-meter. I discovered at this time that 2 solders were broken on the PCB! After resoldering them and clearing the codes the lights went away, and I was able to turn traction control/active handling on/off, and also enable competitive driving mode. I have made a red rectangle around the 2 connections that I resoldered. For anyone else working out the same issue, I would recommend replacing the relay while you're in there, since it's a known point of failure.
Attached Images  
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Old Apr 19, 2015 | 10:50 PM
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thank you for posting your repair.
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Old Apr 20, 2015 | 07:35 AM
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Great job of finding the root cause. Thanks for the great picture and closing the loop.
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