P0803 Code

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Aug 18, 2006 | 10:47 AM

Jumper

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Instructor

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From: Apex NC

P0803 Code

I know it has to do with my CAGS. I have noticed that the car has been wanting to go into 4th at times and my clutch feels funny when I shift on occasion. When I purchased the car, it already had a CAGS defeat installed and worked fine. When I had headers and a tune done, the tuner reprogrammed it so the shift light did not come on and I thought he also programmed to not use CAGS altogther.

So the question is, why am I throwing the 803 code? If I just had the CAGS defeat, I know it can go bad. But if the PCM does not even try to use CAGS at all, then a defective CAGS defeat should not matter, correct?

Should I remove the CAGS defeat and see what happens?

Any suggestions are appreciated!

Aug 18, 2006 | 11:46 AM

HummelS

Race Director

Joined: Aug 1999

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From: Manhattan, KS Missing SoCal since 2005

From the service manual: "Low system voltage can cause this DTC to set..."

Any chance your battery is going South?

Aug 18, 2006 | 12:10 PM

Jumper

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From: Apex NC

HummelS,

I suppose that is entirely possible. It seems to crank fine, but it is still the original AC Delco battery so you never know

I will have to have it checked since you mention that.

Thanks!

Jumper

Aug 18, 2006 | 12:17 PM

Cozmo

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From: Kerrville, Texas USA Hook 'em Horns!

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St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17

Check your alternator also.

Aug 18, 2006 | 02:31 PM

Jumper

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From: Apex NC

Good idea Cozmo. I will be sure to have that checked as well.

Thanks!

Aug 20, 2006 | 01:55 PM

Jumper

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From: Apex NC

Battery and alternator both tested fine. Guess I will try removing the CAGS and see what happens. If that doesn't help I will take it to the dealer.

Aug 20, 2006 | 06:13 PM

Stonecutter908

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From: Downingtown, PA

Try posting over in the Tech section.

Aug 20, 2006 | 06:43 PM

Jumper

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From: Apex NC

I removed the CAGS defeat and cleared the code. So far the Check Engine light has stayed off. The PCM was reprogrammed with the header install and tune so I don't need it. If everything stays fine this week, we will know it was something with the CAGS defeat.

Thanks for all the input.