derek_silvy

I used the Actron code scanner @ work today on my truck and it found P1336 --- two occurances of it.

The Actron scanner said "Ignition System or Misfire."

I thought, "well crap, maybe I've got ignition problems or maybe my tune is off."

I got home today and looked at the code in my Haynes manual and it said "P1336 ----- Crankshaft position sensor system variation not learned"

To me, this brings to mind all the "crankshaft relearn things I've seen." The truck runs okay. I do feel a slight bump every now and then @ idle. Does this really effect performance or mileage?

What all is involved in the "relearn procedure." How bad will the stealership rape me on this? Is it even neccesary?

jimmyblue

iTrader: (11)

In my case the relearn (which is supposed to happen
automatically) was being inhibited by an emissions
hardware fault. This is pretty obscure and I had no
code indicating the thing they replaced (just the
learn abort). They swapped out some fuel tank
pressure sensor, they said.

If you can find yourself a buddy with EFILive Pro they
can try the crank relearn procedure; if it won't go
then you're pretty much stuck with whatever the
dealership.

derek_silvy

Thanks for the reply. I did have a code from the rear cats being cut off, but Herter tuned that out. Could the rear cats, even though their codes are being ignored by the PCM, be causing this crankshaft position relearn fault?

I'ld hate to go to the dealership and them a) say I have to have the cats before they will work on it or b) do something crazy like call the EPA on me.

one03sierra

iTrader: (1)

ATTENTION: Your vehicle may not start unless this procedure is performed.

GM introduced an anti-theft system in 1996 and newer vehicles.

In order for your vehicle to start, you must perform the passkey relearn procedure.

If your vehicle’s battery is low, it is recommended a battery charger be hooked up at this time.

This Procedure will take approximately 20-30 minutes.



After your PCM is installed, please perform the following.

You may want to be outside your vehicle so shut the door, roll down the window.



PROCEDURE:



Insert key, attempt to start the vehicle and leave the key in the ON position.
In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.

When the Security light goes OFF, turn the ignition to the OFF position.
Leave ignition OFF for 20 Seconds.

Attempt to start the vehicle again and leave the key in the ON position.
In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.

Turn the ignition to the OFF position for 20 Seconds.
Attempt to start the vehicle again and leave the key in the ON position.
In some vehicles, the Battery and Security light will blink for several seconds, and then shut off. Then the Security light will then remain ON. Leave the ignition ON until the Security light goes OFF. This will take more than 5 mins.

Once this entire procedure has been completed (three times) your vehicle will start on the fourth attempt.


Note: Some vehicles perform the relearn in a different sequence. You may notice your security light, battery light and abs light will alternate. Once the security light is left out of the sequence that is considered one step. Repeat the procedure two more times and on the fourth time your vehicle will start.





FAQs:

- The procedure was just completed now my car is making a clicking noise when I attempt to start it.

Your battery may have become too weak to crank the engine over.

- I performed the procedure and my vehicle still doesn’t start

Please repeat the procedure again.

derek_silvy

That is the security relearn procedure, but I do really appreciate the help.

I need a crankshaft position relearn