Trailblazer limp mode problem

Asked by xposure2517 Dec 27, 2018 at 03:06 PM about the 2003 Chevrolet Trailblazer LS RWD

Question type: Maintenance & Repair

I have a 2003 chevy trailblazer ls 4.2I. I replaced
the A/C relay and the A/C worked after that
however; after I started the vehicle a little later, it
started in what I understand to be limp mode.  The
throttle body will not open when it's running but will
with ac only on. I'm getting codes p1340 and
p1345 which are cam sensor bank 1 and cam
sensor correlation. I have tested AND replaced the
cam position sensor, throttle body, crank position
sensor, map, maf, vvt solenoid, and pedal position
sensor. I have checked and rested all fuses and
relays. I have traced wiring and completed a
compression test on all 6 with good results. My
engine and trans both have 80k miles. Any actual
solI'd ideas that can be conducted on my own
would be helpful. Thanks.

3 Answers

I forgot to mention that it will not rev beyond 2500 rpm and if I drive it (which is nearly impossible) my cat heats up nice and red because of dumping fuel because of insufficient air due to the throttle body being locked out by the pcm and while driving, at some point it will give me reduced engine power. It shakes and stutters but never stalls. Always starts.

I had the same issue on my 05 4.2 T.B. and could get it to go away by turning the car on and off replace the throttle body Pedal and computer and it ended up being a bad radiator fan hope this helps it's in the same circuit as all that stuff.

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