Truck Stalls
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Posting Guru
Joined: Aug 2004
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From: Rural Central Ohio
Truck Stalls
I have a 2001 F250 w/ the 7.3 and sometimes the truck will stall randomly. It will happen when the truck is shifted into a gear. Often from reverse to drive but other times it will stall in intersections as well 
. It does have a 4 position TS chip. I recently took it into a shop so they can run some codes and they came out with a "PCM Failure" code. Is it possible for the truck to run and still have <acronym title="Powertrain Control Module">PCM</acronym> failure or does the <acronym title="Powertrain Control Module">PCM</acronym> either work or completely fail. Regardless, I feel that this is an issue with the chip or its installation and will be removing it in the meantime. Just was wondering what your guys' opinions/comments were.
. It does have a 4 position TS chip. I recently took it into a shop so they can run some codes and they came out with a "PCM Failure" code. Is it possible for the truck to run and still have <acronym title="Powertrain Control Module">PCM</acronym> failure or does the <acronym title="Powertrain Control Module">PCM</acronym> either work or completely fail. Regardless, I feel that this is an issue with the chip or its installation and will be removing it in the meantime. Just was wondering what your guys' opinions/comments were.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
#1 REMOVE THE KEYS FROM THE IGNITION before you pull the chip. If you unplug the chip with the keys in the ignition WILL give you a PCM failure and the truck will no longer start.
Next, if you have a chip, a P0603 PCM code is a given. A P0605 (bad PCM) code is not unheard of. If the truck starts and drives down the road, you don't have a PCM failure.
A loose chip can cause the truck to cut out. A CPS can cause the same issue, but usually leaves a code. A shorted wire near the shifter can cause a problem if shifting is what's making it stall. Also, the main engine wiring harness (big harness running up and over driver side valve cover under air intake) can chafe and cause a short to ground that can also cause this same issue. Check the wires below and above the square box at the valve cover for any signs of chaffed wires. Also inspect the wiring harness that runs over the top of the driver side front shock.
Next, if you have a chip, a P0603 PCM code is a given. A P0605 (bad PCM) code is not unheard of. If the truck starts and drives down the road, you don't have a PCM failure.
A loose chip can cause the truck to cut out. A CPS can cause the same issue, but usually leaves a code. A shorted wire near the shifter can cause a problem if shifting is what's making it stall. Also, the main engine wiring harness (big harness running up and over driver side valve cover under air intake) can chafe and cause a short to ground that can also cause this same issue. Check the wires below and above the square box at the valve cover for any signs of chaffed wires. Also inspect the wiring harness that runs over the top of the driver side front shock.
