What type of tool or reader do I need to see pcm codes?Thanks,

IIRC the key trick works on the 06 also, did it on my friends 06 and got them a couple years ago.

I should invest in one. What is IIRC, and What is the sequence when using the key?Thanks for the help.The issue I'm having is continued tachometer reading low after warm up. I can see via the dash voltmeter that something is still cycling because of big fluctuation.This started as the temps began to stay near freezing.

Sounds like the grid heaters are cycling in and out which is typical for cold weather operation. But the key trick will work. Turn the key ON, OFF, ON, OFF, ON without starting within 5 seconds and the Odometer will display the error codes of both the ECm and PCM. As for reseting codes you'll need a code reader of some sort...

IIRC "If I Remamber Correctly" Forum lingo I had to learn years ago too. start with key off then cycle key on /off ending with key on the 3rd time but do not start just go to ignition on position. and look at the odometer and it will scroll through the codes. The grid heaters pull a big amount of amperage and will do so for quite a while after start up until you pass 15 mph and or intake temps get to a set level.

Thanks for the tips.It has still been cycling after a 40 mile drive.

Yep somethings wrong unless you are noticing the ac compressor cycling if you have the defroster on. The grids should stop after ground speed reaches 15 mph or so.