I decided today to run the x3 for codes as I have had a rough idle on a cold start. The truck has even stalled a couple of times. I got 3.
P0600 - Serial Communication Link
P2105 - Throttle Actuator Control System Forced Engine Shutdown
U0300 - Internal Control Module Software Incompatibility

From a quick google search, it looks like my pcm may be bad? Or if I get lucky I may get away with a reflash at the stealer. Anyone have any ideas? I have to aircare (emissions test) before the beginning of September or I can't renew my insurance. I had to return the truck to stock as it was pinging really bad under load and at light throttle with no load with my 87 tow tune. As much as I want to blame my x3 I don't think a programmer can cause a pcm to become damaged. Truck did this with the tune in place and stock. Also I tested the resistance of my coils today and 4 of them are 250-400 ohms higher than the rest. Maybe weak coils?

 

The majority of the time when you get the throttle control code, it is a dirty throttle body.

Sent from my iPhone using IB AutoGroup

 

I'll give the throttle body a cleaning and clear the codes.

 

So far so good on the throttle body cleaning. Anyone have any ideas for the communication error codes?

 

I wouldn't worry about them, programmers can do strange things like this.

 

Thought I would update. None of the codes have returned, everything is clear now

 

That's great, and thanks for letting is know.

Sent from my iPhone using IB AutoGroup

 

And the truck flew through emissions testing today. What a big relief