On a side note I think this issue might be different. You may need some adjustment in your tune for this case. I think you are reaching the limits in the Calc Airflow - P1514/P0068 error table which will cause the reduced engine power mode. I had this problem a couple of times after installing my cam and had to raise the values since I was getting more airflow than expected by this table at WOT on occasion.

 

i had the same problem with my 03 dbw engine reduced power I replaced the throttle body and it went away

 

I ordered a new throttle body as the ls 2 have no serviceable parts. Not cheap at all. Local dealer said $540 my dad has a friend and got me one for $195 plush shipping but no one stocks htese units. What a ******* pain.

 

i ran into this problem also at first then i adjusted the same table that truckmann did. that fixed my problem down low, but i was still goin into rep mode at wot. i change tbs and tac modules and the gas pedal. i couldnt get it to go away. then i got the new version of hpt, the beta version that is currently out and they had a tab in there to adjust the amount the tb opens and the area of air flow at different tb opening %. i made a few adjustments and the problem is completly gone now. it seemed that the x-link was puttin the tps out of voltage range and would trip the rep mode. so i set the tb to the max setting that tb would go before tripping the rep mode.

 

I will keep that in mind if I have anymore issues

 

bad x-link. chaged the TAC module and harness and no more problems. Now I got an extra 90mm TB.

 

Hmmmm... ding ding ding.

Glad you got it going. FWIW my second x-link has been trouble free.

 

Yeah, I will get another one. Grant at torque rush offered to send me a new one if I pay for shipping so i think that is a pretty fair deal.

 

I have been having problems like this for 2 + years intermitently. I already adjusted the P1514 table long before the X adapter. REP started with WOT runs. It has been off and on while normal driving with P2135 codes and sometimes P0220. Today it is non-stop going in REP and P2135 after resetting codes with my interceptor gauge. Maybe a 30 second delay between clearing codes and REP again.
I haven't replaced anything yet but have always had a hunch about the x link cable. It has been just a PITA but now it isn't drivable. Any other insight is appreciated.

 

I had to switch to the 02' tac module and the apropriate tb wire harness...problem solved.