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Discussion Starter · #1 ·
All,

I autocrossed the z06 for the first time last weekend. What a blast. Spun it the first run! Anyway, it was an autocross school and the instructor drove my car as well. When he drove it, the car completely shut down twice. Once on each of his runs. The car totally turned off in the middle of the run. The car had 3/4 of a tank of gas so that was not the issue. It is an 04 with 1,800 miles. The only "user error" that I can think of that might have caused it is that maybe his elbow hit the "traction control button" during the run. Would this cause a shutdown of the car? I can't think of any other reason why the car would shutdown on him twice and not on me. I must have done 15 runs without any issues.

Thanks for the help!
 

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That IS strange...do you have any codes? :-?
 

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Your codes should still be stored.
This must be retrieved by an LS1 module to review.
Your local dealer should be able to print them out for you @ no charge.

Good luck.
Bill. ;)
 

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Do you mean it shutdown between shifts? That's normal with Traction Control on. :cheers:
 

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The IPC display, the 20-character, vacuum florescent screen above the steering column that says "Corvette by Chevrolet" every time you turn on the key is a powerful device.
DIY Service Techs are going to be most interested in the LPG’s ability to show diagnostic trouble codes (DTC) for all the modules that transmit them..

The "diagnostic display" mode is entered with the following Procedure: Page 8-500

Turn on the ignition but don't start the engine.
Press the "reset" button to turn off any warning messages
Press and hold "options" and
While holding "options", press "fuel" four times within a 10-Second period.
Initially, the on-board diagnostics go into the "automatic" mode, which shows each module's DTCs in a pre-set sequence: (Page No. are for the GM Service Manual)

10 PCNI Powertrain Control Module page 6-357 - 6-361
28 TCS Traction Control system ABS on page 5-86
?? RTD Real Time damping page 3-136
40 BCM Body Control Module page 8-405 LTD Page 8-727
60 [PC instrument Pane! Cluster page 8-508
80 radio page 8-213
99 FIVAC Heater Vent-Air Conditioning page 1-118
A0 LDCM Left Door Control module page 8-904 to 8-951
Al RDCM Right Door Control Module page 8-904 to 8-951
AC SCM Seat Control module page 8-1064-8-1082
B0 RFA Remote Function Actuation page 8-676
For each module, all DTCs will be displayed. If none are present in a module, you will see "no more codes" on the ICP display. There are two kinds of DTCs, "Current" and "History," designated with a letter suffix, "C" or "H". A current code indicates that the malfunction is present in the system whose module is displaying data. A history code indicates a problem existed in that module sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it is possible it's evidence of a previous problem. Now solved, that was not removed by clearing codes. More likely is that a history code indicates an intermittent malfunction.

"Intermittent" are the most challenging DTCs. An intermittent may have happened only once, may have happened more than once but is inconsistent in its appearance or may be happening on a regular basis but not at the time the IPC is displaying codes. History codes can also be caused by a current malfunction in a system that is not Operating at the time DTCs are displayed. An example is the rear window defogger, which doesn't operate until the BCM detects engine rpm. For history codes set by a system that does not operate with the key on and engine off, a special diagnostic tool called a "scan tester is necessary to properly diagnose the malfunction.

Once the IPC has displayed all 11 modules, the system goes into the manual mode, which allows selection of each module, using combinations of DIC buttons. The manual mode can also be entered at any time during the automatic sequence by pressing any button except "E/M". Once the IPC displays "manual diagnostics", you may select a particular module by pressing the options button to go forward or the "trip" button to go back. Once a system is selected and a DTC is displayed, if more than one are present; press "gages" To move forward or "fuel" to go back. To exit the diagnostic mode at any time, press E/M". If you want to erase or "clear" codes, press "reset". Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory.
 

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If you have full active handling and traction control on when pushing hard in the corners, the system will sense that the rear end is sliding and abruptly cut the power to the rear wheels. It can be unsettling. I had this happen to me a couple of times when I forgot to put it in comp mode.
 

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Discussion Starter · #10 ·
I had both AH and traction control off. The car completely shut down; as it turned off in the middle of the course. The instructor had to restart the car by turning the key in the ignition. We could see the fuel gauge needle go to zero as the car was shutting down. He thought we were out of gas but I had filled it up the night before. After he restarted it, it was fine. The weird part was that it only happened to him and only 2 times. I drove about 15 runs and it never happened to me. That's why I thought he may have hit a switch or something to make the car turn off.
 

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How many extra keys do you have dangling on your key chain? I've managed to shut mine down twice now while autocrossing because my right knee would hit my key fob and extra keys and spin the ignition key to the off position! The first time it happened I didn't realize what caused it, but the 2nd time it happened one of my extra keys was wedged between the ignition key and the round bevel of the ignition. Thats when I realized I had accidentally shut the car off! Now when I autocross I use just the ignition key with out the key fob.
 

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Maybe you have an ignition switch that is about to go bad. OR maybe you have too many keys on your keyring and the high G loads from cornering were causing the ignition switch to move just enough to shut off the car. That would be my first guess since the guages were all dropping to 0. If he had the seat positioned right, his knee could have very easily been pushing the extra keys on the ring into a position that would shut off the car too. (been there, done that before....)
 

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Discussion Starter · #13 ·
These last two posts may be right. I only had the ignition key and the key fob on the chain. However, the instructor was much bigger than I and had a hard time getting a good seating position. He also was very close to the steering wheel so maybe his knee hit the fob or ignition key while he was driving. I am still going to have the dealer check it out. I will let you know what I find.

Thanks for the help!
 

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All good suggestions above. Knowing how to check the codes is very valuable. I look at them often to see if my car is developing any problems.

Knee to key fob sounds plausible. However, there may be another cause you can investigation: loose grounding wire connections.

Mid last season I had my car shut down on me several times. After days of trouble shooting the cause was found to be a slightly loose connection from the battery to the front fuse panel. However, any of the other dozen or so ground wires could interrupt some signal the the PCM that could shut the car down. Hopefully this isn't your issue as this was a pain to find. :cheers:
 

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I don't left foot brake when I autocross, but I have a buddy who does. He was codriving a Nissan 350z at the National Tour event in Walnut Ridge last weekend and the 350z shut down twice because of the left foot braking.

Just a thought.
 

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I drove my students car last weekend and I was talking so much, I forgot to disable the traction deal. Car went nuts and shut down. I told him we had a tire issue and we need to check it. YES, this guys 2004 Z06 had all of 20 pounds per tire! No wonder it handled like that. Many things need to be checked on these cars!!
 
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