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How do you reset the pcm on 07 trailblazer - 2007 Chevrolet Trailblazer 4.2

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Rear ac blows in my 2004 Chevy trailblazer when vehicle is off. Front ac is off. What could be the problem? Just started after changed coil pack and hooked battery back up.


Turn everything, all switches, off then disconnect both battery cables and leave disconnected for 30 minutes. This resets PCM to defaults. Then reconnect ( + ) first then ( - ).

Feb 25, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

Need to reset the PCM on my 2003 Chevy Trailblazer .How do i do it?


Disconnect the NEGATIVE battery cable from the battery... Hold it or position to the POSITIVE battery cable for about 5 minutes. Also make sure you leave the key in the ON position (Do not have the engine running) and this will clear the memory on all computers/modules in the truck.

Jul 04, 2014 | 2003 Chevrolet TrailBlazer

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2004 trailblazer problems


Check for OBD2 codes, primarily a code indicating PCM memory is corrupt. My Trailblazer at times wouldn't turn over and start. Nothing at the key. When you attempt to start the vehicle and you turn the key to the start position, the PCM sends a signal to the starter relay to start the engine. Youtube video showed a mechanic warming the PCM with a hair dryer, and it would start. Tried it on mine and it started fine. If it is the PCM, the remedy is PCM replacement. Got mine from pcmforless.com about $100.00. They had to program the new PCM with the vehicle vin number. Once installed no more problems.

Apr 04, 2014 | 2004 Chevrolet TrailBlazer

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2004 Trailblazer 6 cyl. idles too low and sometimes will kill but runs great. A scan code of P0606 comes up which relates to the pcm but this has been going on for over a year and it helps idle better...


The low idle could be caused by a dirty throttle body (TB). Take the TB off the intake and clean it thoroughly front and back sides. While doing the cleaning, disconnect the battery to reset the PCM. This will allow it to relearn to the cleaned TB.
As far as the P0606 code, it is possible that the PCM only needs to be reflashed (memory reloaded). This can only be done by a GM dealer.

Aug 26, 2012 | 2004 Chevrolet TrailBlazer

1 Answer

Where is the pcm located on a 2003 chevy trailblazer


5.3L Engine

The Powertrain Control Module (PCM) is located on the left front frame rail.

4.2L Engine

The Powertrain Control Module (PCM) is located in the engine compartment. It is mounted on the left side of the engine.

Nov 28, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

2003 trailblazer keeps blowing pcm fuse. wont start, key stuck in on position.


YOU HAVE MANY THINGS THAT CAN BLOW THE PCM FUSE.STARTER RELAY,ALTERNATOR, PARK NEUTRAL SAFETY SWITCH, FUEL PUMP, AND THE PCM CAN BE SHORTING OUT.

May 01, 2011 | 2004 Chevrolet TrailBlazer

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Battery changed on 2004 chevy trailblazer and now it stalls out and idles really rough...any solution


Sometimes the Computer [PCM] that controls the engine will loose it's memory on how you've driven it when power is removed. It should reset itself after a few miles of driving.

Mar 17, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

What is the pcm in a 2004 chevy trailblazer? and how I can fix it.


PCM is what control's all of your engine sensor's, there's no repair for the PCM, but to replace.

Nov 09, 2010 | 2004 Chevrolet TrailBlazer

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