Its very complicated problem that ive been trying to fix for the last 2 months ... when i turn the key all the way in the ignition the car start and drives normally but everything inside the car does not function , BUT when i turn the key a quick turn the car start and runs great and everything inside functions normally, the check engine light is on throwing the code " serial communication link "
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Last time i had this problem, my car wasnt all the way in park, so what i would try is:
1: apply the break
2: push up on the gear shift, to make sure its in park.( if you can move the gear out of park, move it all the way to drive 2, then back to park.
3: try the key again
first most GM OEM systems will need to recognize the key first and foremost ,to do that you will need to roll window down on driver door,turn the key to the run position and with engine NOT running leave the key on for 10 minutes exactly ..then turn ignition off then try to start engine. if original system is working engine should start normally
turn the igntion on, don't start, let it set for ten minutes Turn it off for 5 seconds then try to start it. If it lost memory for some reason and doesn't start . then do this three times , after the third time start it. that is the relearn procedure. Have a charger on it for the 30 minute relearn. Relearn is on for ten m off five s on ten off five on ten off five then start
Ive got a 1998 A6 2.8 Quattro
Ive changed the gearbox and the vehicle dont start now.
the engine swings from the starter but when using the key it turns once and nothing happens thereafter the key is locked in on position where im getting ignition lights
Ok then, from your description and the
make/model/year of the car you have there,
it appears you've reset the VATS.
The car's security immobilizer
reader at the key switch
does not recognize the coded
chip in the ignition key any longer.
You can try to put the key
in the ignition, turn to the on position &
wait at least 10 min like that.
(Do not turn off the key switch before
10 minutes as elapsed!)
Once done, the key is re-programmed and
should allow the fuel injectors to work again.
The car would start now if corrected.
In some cases, the VATS (GM'S VEHICLE ANTI THEFT SYSTEM)
will re learn the code this way, and will then
allow the restart, however if this does not work,
then you can simply tow it to any GM vehicle dealer
to have the service department re code it.
There is a permanent solution though.
Adding the PLJX Self learning Bypass module (59.95)
will bypass the PASSLOCK system in your vehicle
for good. See this at www.PASSLOCK2.com
Good luck I hope method 1 does the trick!
Here is the 30 min relearn:
Ignition keys relearn takes about 30 min to do. 30-Minute Learn
Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to
start the engine, then release the key to ON; the vehicle will not
start. 3. Observe the SECURITY tell tale light. After approximately 10
minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and
wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a
total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now
ready to relearn the Passlock Sensor Data Code and/or
passwords on the next ignition switch turn from OFF to CRANK Important:
Turn the Ignition Switch OFF. The vehicle learns the Passlock
Sensor Data Code and/or password on the next ignition switch transition
from OFF to CRANK. You must turn the ignition OFF before attempting to
start the vehicle. 6. Start the engine. The vehicle has now learned the
Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs
will self clear after 100 ignition cycles. Without a scan tool you may
have momentary starter interruptions while history clears itself.
When this happens and the key is in the Ignition position, do the dash lights, etc come on? Could be the ignition switch is bad, and this is and easy way to tell. If the ignition is on and when we go to START, nothing happens, I would replace the starter/solenoid next.