unbelivable Electrical problems
Thread Starter
Heel & Toe
Joined: Apr 2007
Posts: 22
Likes: 0
unbelivable Electrical problems
Hello. I am new to this forum,Just bought my first Corvette 2002 zo6 
car was hit in the front and repaired. Here is my problem: driving or standing, without warning the car shuts off, fuel gage starts to go nuts left to right and back, oil pressure gauge does the same, water temt. gauge follows, all occuring at the same time. The messages that I am recieving are engine hot, low fuel ,resurve fuel,transmission temp hot, reduce power, service vehicle, service active handling,service traction control, under the engine fuel solinoid clicking and going crazy. 10-15 min later all stops, car starts no current codes. All I see is the history codes whic are: lost comunecation codes, water temp low voltage code, fuel tank low voltage code, map low voltage code , system high voltage code, trans low voltage,
all grounds cleaned, Can this be pcm problem? Please help
car was hit in the front and repaired. Here is my problem: driving or standing, without warning the car shuts off, fuel gage starts to go nuts left to right and back, oil pressure gauge does the same, water temt. gauge follows, all occuring at the same time. The messages that I am recieving are engine hot, low fuel ,resurve fuel,transmission temp hot, reduce power, service vehicle, service active handling,service traction control, under the engine fuel solinoid clicking and going crazy. 10-15 min later all stops, car starts no current codes. All I see is the history codes whic are: lost comunecation codes, water temp low voltage code, fuel tank low voltage code, map low voltage code , system high voltage code, trans low voltage,
all grounds cleaned, Can this be pcm problem? Please help
Pro
Joined: Feb 2007
Posts: 716
Likes: 0
From: West Covina CA
damn sounds like a technicians headache... Lucky for u i love problems....u may have a problem with one of the onboard PCMs.... it sounds like the problem will occur in closed loop when the car learns its parimeters. at first i thought ground but that wouldnt cause that big of a problem... sounds like one of the onboard PCMs is loosing communication... u may have a lost connector at one of PCMs or an open short in a wire causing it to go crazy. see if the problem happens while driving on bumpy roads or higher speeds. all those functions are controlled by 2 of 13 onboard PCMs...
Racer
Joined: Dec 2006
Posts: 314
Likes: 0
From: Newport News Va
Check the pins on the star one connector for loose or broken pins. I had problems with the dash going nuts and after 2 pcm changes the dealer found some loose pins on the star one connector loose. The connector is located under the passanger toe board next to the BCM.
Thread Starter
Heel & Toe
Joined: Apr 2007
Posts: 22
Likes: 0
Can someone send me a pic of star one connector? The battery is new, however I will load test to confirm that it's holding the voltage....Thank you all for your help!!!
The car is in the process of getting a new PCM...I'll update with findings.
The car is in the process of getting a new PCM...I'll update with findings.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
I'd check that battery first before you splash out on a new PCM. Sounds like it could be a bad battery to me
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Racer
Joined: Dec 2006
Posts: 314
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From: Newport News Va
Drifting
Joined: May 2000
Posts: 1,917
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From: Southern NH
Agree to check the grounds. There's a sticky post at the top of the tech forum for this.
When the computer modules start going haywire like you describe the most likely cause is a poor ground contact that can cause noise on the BCM/PCM data lines and throw random codes and operation as you describe. Since you say you were hit and there are major ground points on the front frame rail it's very likely that the ground is intermittently opening or making poor contact. Check all the ground points, open them, clean them and make sure they are making a proper connection - I'll bet your problem will be resolved.
When the computer modules start going haywire like you describe the most likely cause is a poor ground contact that can cause noise on the BCM/PCM data lines and throw random codes and operation as you describe. Since you say you were hit and there are major ground points on the front frame rail it's very likely that the ground is intermittently opening or making poor contact. Check all the ground points, open them, clean them and make sure they are making a proper connection - I'll bet your problem will be resolved.
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
damn sounds like a technicians headache... Lucky for u i love problems....u may have a problem with one of the onboard PCMs.... it sounds like the problem will occur in closed loop when the car learns its parimeters. at first i thought ground but that wouldnt cause that big of a problem... sounds like one of the onboard PCMs is loosing communication... u may have a lost connector at one of PCMs or an open short in a wire causing it to go crazy. see if the problem happens while driving on bumpy roads or higher speeds. all those functions are controlled by 2 of 13 onboard PCMs...
Ahhh ...there is only 1 PCM on this car
PCM = Power train control module
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
Hello. I am new to this forum,Just bought my first Corvette 2002 zo6
car was hit in the front and repaired. Here is my problem: driving or standing, without warning the car shuts off, fuel gage starts to go nuts left to right and back, oil pressure gauge does the same, water temt. gauge follows, all occuring at the same time. The messages that I am recieving are engine hot, low fuel ,resurve fuel,transmission temp hot, reduce power, service vehicle, service active handling,service traction control, under the engine fuel solinoid clicking and going crazy. 10-15 min later all stops, car starts no current codes. All I see is the history codes whic are: lost comunecation codes, water temp low voltage code, fuel tank low voltage code, map low voltage code , system high voltage code, trans low voltage,
all grounds cleaned, Can this be pcm problem? Please help
car was hit in the front and repaired. Here is my problem: driving or standing, without warning the car shuts off, fuel gage starts to go nuts left to right and back, oil pressure gauge does the same, water temt. gauge follows, all occuring at the same time. The messages that I am recieving are engine hot, low fuel ,resurve fuel,transmission temp hot, reduce power, service vehicle, service active handling,service traction control, under the engine fuel solinoid clicking and going crazy. 10-15 min later all stops, car starts no current codes. All I see is the history codes whic are: lost comunecation codes, water temp low voltage code, fuel tank low voltage code, map low voltage code , system high voltage code, trans low voltage,
all grounds cleaned, Can this be pcm problem? Please help
This sounds like a BCM (body control module), as stated above one of the star connectors may have a loose connection or one of the data link bus wires may be shorted.
Just to rule out 1 thing, pull up the floor mat on the passenger side and check to make sure the carpet is dry, is it?
Thread Starter
Heel & Toe
Joined: Apr 2007
Posts: 22
Likes: 0
It's the fuel solinoid that is going crazy under the hood, also had a tak code failure. Can the tak code cose the problem? No BCM codes, No water damage, ....Thanks for all the HELP.
Last edited by rally; Apr 22, 2007 at 06:36 PM. Reason: ADDING INFO
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
There is no fuel solenoid under your hood, what exactly is clicking, any pictures?
The TAC module will cause the car to go into reduced power mode and will also cause a few other problems but it won't cause the cluster to freak out, thats more of a BCM problem.
