C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Codes for the CCM!!!

Old Jun 24, 2002 | 06:33 PM
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Default Codes for the CCM!!!

Was not able to pull the codes by ground the A & B terminal. The SES light just stay on. Had to ground the A & G terminal to access the CCM. the codes I get is 1. C41, H41; 4. Err and 9. H72. I think the 1. is for the CCM and the 4. is for the ECM. When I start the car she idles fine but the fan are on and the SES and ASR light stay on. Does anyone know what these codes are.
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Old Jun 24, 2002 | 07:09 PM
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Default Re: Codes for the CCM!!! (93vetteguy)

http://www.c4vettes.com/ecm.htm

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Old Jun 24, 2002 | 07:28 PM
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Default Re: Codes for the CCM!!! (Lone Ranger)

C and H are Current and Historical. Code 41 is "Loss of ECM serial data communications." for the CCM

9 codes are the ABS/ASR module. Code 72 is "LCD dimming output signal circuit open or shorted to ground.

I would vote for a loose connector, bad wiring harness, or a shot ECM.

Loss of comm would explain module 4 ERR - unabe to talk to the ECM.

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Old Jun 24, 2002 | 11:27 PM
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Default Re: Codes for the CCM!!! (93vetteguy)

Thanks Lone Ranger and Matt Black for the information. It looks like I need to order a new ECM. You guys are the greatest!!!!!!!
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Old Jun 25, 2002 | 09:54 AM
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Default Re: Codes for the CCM!!! (93vetteguy)

Had the exact error codes along with a flashing SYS light. $99 ECM from MAD and the issue is no longer.
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Old Jun 25, 2002 | 10:11 AM
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Default Re: Codes for the CCM!!! (Matt Black)

Code 72 is "LCD dimming output signal circuit open or shorted to ground.

This one is probably a result of an aftermarket stereo install. But I agree with the other info pointing to a bad ECM or harness. :cool:
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Old Jun 25, 2002 | 07:34 PM
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Default Re: Codes for the CCM!!! (Marcho Polo)

<<<Aftermarket stereo - open ckt>>>

Good one. The young gent with the new aqua metallic ride was at the Cruise-in and Gordon K said something about that. He gave an explanation about how, to make it go away, the owner needed to install a couple of high-value capacitors (maybe it was resistors) on a certain lead wire. My eyes glazed.
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Old Jun 25, 2002 | 10:25 PM
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Default Re: Codes for the CCM!!! (Matt Black)

Actually, just cheap resistors. :crazy:
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