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Discussion Starter · #1 · (Edited)
Hi,

I am at wits end with a problem Ive been having. We'll keep this story as short as possible...

The red lighting bolt is flashing on the dash along with the check engine light. I've read fourm after forum and no luck. The truck runs just fine but won't shift in to over drive. DTC shows high pressure in the map sensor and high voltage in the IAT and Coolant sensor. I've replaced the ECM, map, iat, coolant senors, alternator, throttle body and battery, along with running new grounds and checking all if the wiring and I just cant seem to figure it out.

Again, the truck runs fine with full power, but won't go above 4000 rpm or shift in to overdrive.

Any input would be appreciated.
 
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