help with OBD code 26

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Dec 29, 2015 | 07:13 PM

REVIVER

Thread Starter

Racer

Joined: May 2003

Posts: 323

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From: Land O Lakes, FL

help with OBD code 26

Need a little help to understand and fix a fault code 26, LCD blanking control circuit shorted to battery or CCM internal open. Anyone know what this means and a fix for it. 1993 LT1
Is it the CCM or can I check an input for this?

Thanks
Reviver

Dec 29, 2015 | 07:59 PM

REVIVER

Thread Starter

Racer

Joined: May 2003

Posts: 323

Likes: 0

From: Land O Lakes, FL

Wow, sounds more serious than I expected. The service engine soon light came on this morning on the way to work and went out when I shut down and restared. It came back on about half way home and reset again after shut down. I didnt notice anything strange about the way the car was running either time.

Dec 29, 2015 | 08:06 PM

REVIVER

Thread Starter

Racer

Joined: May 2003

Posts: 323

Likes: 0

From: Land O Lakes, FL

I dont know what I did but when I replied to your last post it washed yours out. Hate to be trouble but can you cut and paste it back in?

Dec 29, 2015 | 08:57 PM

don hall

Safety Car

Joined: Aug 2002

Posts: 3,842

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From: SANTA CRUZ CA

https://answers.yahoo.com/question/i...gm%20code%2026

Please be advised that these solutions are for GM cars, and not Corvette specific.

Last edited by don hall; Dec 30, 2015 at 10:06 AM.

Dec 29, 2015 | 09:12 PM

REVIVER

Thread Starter

Racer

Joined: May 2003

Posts: 323

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From: Land O Lakes, FL

Got it, thanks. I will start looking into these areas hopefully I can figure it out.

Dec 30, 2015 | 06:29 AM

WVZR-1

Team Owner

Joined: Sep 2003

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I believe you've an ECM CODE 26 and NOT a CCM code. How did you check? Are you sure you confirmed the correct module? ECM 26 is a Quad-driver module and would likely set the CEL you mention. You mentioned OBD but then CCM and noted the CCM 26 fault description.

I didn't look at the link that was supplied but just read your post and you mentioned the CEL.

Clarify maybe and it might be easier to help you.

Last edited by WVZR-1; Dec 30, 2015 at 06:31 AM.

Dec 31, 2015 | 08:16 AM

pcolt94

Le Mans Master

Joined: Jan 2006

Posts: 5,620

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From: Orlando FL

This is a great thread. It explains the error code in detail and what the probable cause might be as well as the related components. Takes a lot of the mystery out of it.

https://www.corvetteforum.com/forums...code-26-a.html

Dec 31, 2015 | 06:19 PM

REVIVER

Thread Starter

Racer

Joined: May 2003

Posts: 323

Likes: 0

From: Land O Lakes, FL

I retrieved the 26 code by using the shorting plug on the connector under the steering column. Ignition on not running and counted the service engine soon light flashes. 12,12,12,26,26,26,12,12,12

The light resets every time I shut down and restart. It stays out for about 15 to 20 minutes and than trips and stays on the remainder of my 45 minute drive. No noticed driving issues.

Great info on those two links guys, I have the weekend off and plan to do some checking on these areas. I have a 1991 service manual I got with the car when I bought it last year and it shows the purge solenoid above the canister at the back right corner of the car just behind the rear wheel as the possible culprit if it is an ECM code.