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Todd Audette
Todd Audette, Chevy Technician
Category: Chevy
Satisfied Customers: 428
Experience:  Chevrolet Technician
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1998 corvette 5.7 automatic had multiple broken wires and a

Customer Question

1998 corvette 5.7 automatic had multiple broken wires and a lot of broken grounds from mice i have fixed all grounds and powers. My only issue now is trans is stuck in limp mode and only code i am getting is a p0801 for reverse inhibitor switch for a auto trans??? originally i found all the broken whiles and a burnt ignition relay i also found that it has a brand new reman pcm. Im wondering if the new pcm was programmed with bad grounds and thats my issue but i need a second opinion. I now have scan tool communication with pcm tcm but no solenoids will function. I dropped pan and am getting 12v tested ground and no ground tested at pcm still no ground to solenoids cut wire at pcm to 1-2 solenid still no ground out of pcm all other pins on both connectors at pcm have ground for every other circuit
JA: How many miles are on the car? How old is the battery?
Customer: Brand new battery plus keep charger on while testing so i have a constant 12v 45k miles
JA: Are you fixing your Corvette yourself? What have you tried so far?
Customer: Yes fixing at my work and only way i can get trans to shift is dropping it to d1 d2 d3 d4
JA: Anything else you want the mechanic to know before I connect you?
Customer: Nope
Submitted: 8 months ago.
Category: Chevy
Expert:  Todd Audette replied 8 months ago.

Hello, my name is***** to just Answer! I will be assisting you with your vehicle questions today. I have your answer

Customer: replied 8 months ago.
Ok
Expert:  Todd Audette replied 8 months ago.

I'm a tech for Chevrolet and a trans tech. There is a problem with the programming in that PCM. P0801 only sets on a 6 speed Manual transmission...there is no reverse inhibit solenoid on a 4 speed automatic

Customer: replied 8 months ago.
If they programmed the pcm with bad grounds do you think i need a pcm replacement or can i reprogram using my pass through j tool programmer
Expert:  Todd Audette replied 8 months ago.

try reprogramming if you by the VIN if you can do that

Customer: replied 8 months ago.
If reprogram doesnt work would your next step be replacing the pcm
Expert:  Todd Audette replied 8 months ago.

If that doesn't work....replace it....it's programmed for a manual trans

Customer: replied 8 months ago.
Why would gm replace the pcm and program with a manual also say it was programmed for a 6 speed manual is that why i have no scan tool functional testing for all internal solenoids
Expert:  Todd Audette replied 8 months ago.

That question i can't answer....I don't know...all i know is that a P0801 will only set with a manual trans

Expert:  Todd Audette replied 8 months ago.

And yes that is why you have no scan tool functions for an automatic

Customer: replied 8 months ago.
Ok well i have gotten all wiring fixed today i will reprogram tmw and let you know
Expert:  Todd Audette replied 8 months ago.

If you need more help please let me know. At this point i would ask that you click on the stars and leave a 5 Star rating and i will be more than happy to answer any follow up questions you may have as rating 5 Star will not close out your question

Expert:  Todd Audette replied 8 months ago.

How did you make out with the programming

Customer: replied 8 months ago.
I could not program because i need another j tool specific for star connectors to isolate just pcm i did not know so i ordered one and should have tuesday so programming is on hold until then
Customer: replied 8 months ago.
Is that true that i need to plug into star connectors with this took and switch to pcm only before i use my j2534 pass thru tool
Expert:  Todd Audette replied 8 months ago.

Yes that is true on these older vettes..i forgot about that actually

Customer: replied 8 months ago.
i just got j tool and hooked everything up went to reprogram and lost communication with programmer disconnected and hooked up scan tool and no communication with just pcm every other module will communicate just no pcm dash has service vehicle soon reduce engine power low fuel service abs service traction control
Customer: replied 8 months ago.
When i first hooked up j 2534 and j42236 i had communication i went to reprogram pcm everything was going good the vin number it brought up was different then actually car confirming the pcm was changed so i corrected vin went to download and wouldnt let me download i called ac delco they said it was a communication issue with pcm thats when i put the scan tool on it to confirm no communication now i can not get communication back all power and grounds are good crank no start now
Expert:  Todd Audette replied 8 months ago.

Somethings wrong with that PCM man

Customer: replied 8 months ago.
i called everyone no one makes a pcm for this would u recommend sending it out and having it refurbished and would that work if the computer is already out of another vehicle and has issues like i have
Expert:  Todd Audette replied 8 months ago.

Have you tried a GM Dealer for availability

Customer: replied 8 months ago.
Gm was my first phone call they said 0 stock in country discontinued
Expert:  Todd Audette replied 8 months ago.

Shit.....Try sending it out and make sure it's programmed to that VIN

Customer: replied 8 months ago.
Shit is right!!! Would it be possible to buy a used unit and program myself since no one has one i just talked to numerous companys and they said software is to old for them
Expert:  Todd Audette replied 8 months ago.

I think you could do that

Expert:  Todd Audette replied 8 months ago.

Don't forget to leave me a 5 Star rating and i will be available to follow up with you

Expert:  Todd Audette replied 8 months ago.

Where are you at with this

Customer: replied 8 months ago.
I ordered a new pcm they said up to 2 weeks but i am still not convinced why i have no communication now with pcm. I would think i would still be able to communicate with pcm but just get a corrupt pcm code. Vehicle will not start now just crank have reduced engine power service abs traction low fuel i can communicate with all other modules
Expert:  Todd Audette replied 8 months ago.

There's 4 reasons why you can't communicate with any module....Power, Ground, an open in the data circuit or a bad module

Customer: replied 8 months ago.
if i disconnect pcm from system i am still pulling all the dash lights does that make sense?
Expert:  Todd Audette replied 8 months ago.

It could because you have taken a module out of the loop...I think you have a real basket case on your hands to be honest with you

Customer: replied 8 months ago.
I think basket case is being light but unfortunately i can not turn the vehicle away
Expert:  Todd Audette replied 8 months ago.

I understand that