Posted to Technical Discussion Forum on 6/21/2011
104 Replies
This Vehicle is repaired. This is a case history only.
A 2008 Impala was dropped off today. I was given the R.O.
which stated "Vehicle will not crank at times. This only
occurs when the PRNDL indicator is not operating. If the
PRNDL indicator is functional, the vehicle will crank and
start every time. The PRNDL never stops operating when the
car is running and the car never shuts off by itself."
There was no other information available as this was a used
vehicle from a car lot that was dropped off. It was a V6
automatic with no added on modifications.
I went out to the drive to get the car. When I turned the
key, the vehicle would not crank. The PRNDL was lit up but
the gear position indicator (a circle around the letter) was
not lit. I went back into the shop for the tech 2 and ran a
fast module scan. There was no communication with the ECM,
TCM, BCM or VCIM. Suddenly, the gear position indicator
illuminated and the car started. At that point, I had normal
communication with all modules.
I drove the car inside and tried starting and restarting
several times with no problem. I let it sit for 15 minutes
while I finished another vehicle and when I returned and
turned the key to the run position, the indicator did not
illuminate. Leaving the key in the on position, and doing
nothing to the car, after 30 seconds the indicator
illuminated by itself and the car started.
Trying it several more times, I found that if I left the key
off for 10 minutes or so, when the key was turned to run,
the indicator would not illuminate and the car would not
crank. If the key was then left in the run position, after
20 seconds to 45 seconds, the indicator would illuminate and
the car would start.
I know how I diagnosed it. How would you?
James from Florida
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