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GMC Envoy 4.2L I6 Mail Order Tune

5 out of 5 based on 2 customer ratings
(2 customer reviews)


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Product Description

Our performance tuning for the 4.2L I6 typically yields 10-14hp and 1-3mpg, as well as better throttle response, driveability, and more pep off the line. Our tuning also helps with towing if you choose to do so. We can account for most modifications you might have (2002-2005 year models: we are not able to make speedometer corrections or remove park/neutral rev limiter). After placing your order, please fill out an order sheet for your vehicle (here).  What program should I use and what is refundable? Click here! Express shipping only covers one shipment for loaner programs, the second will be returned via UPS Ground unless other arrangements are made.

Please note, 08+ Automatics will have a transmission control module also, if sending in your PCM please include this.

Also, check out our Aeroforce Scan Gauge  – not only is this a helpful gauge for scanning many parameters, but it is capable of performing the CASE Relearn as well (if you are doing a core program).

Additional Information

Weight 4 lbs
Dimensions 9 x 8 x 4 in

2 reviews for GMC Envoy 4.2L I6 Mail Order Tune

  1. 5 out of 5


    I waited for years to order my PCM tune…

    It came today and I could barely control myself. I came right home and installed it. I started the truck up and went for a drive. I noticed right away that the gas pedal was much more responsive and I could feel more power. The shifts were much much nicer.

    First impressions: HOLY SH*T! I started out my going to a straight stretch of road with no traffic. I came to a complete stop, and then dropped the hammer. For the first time EVER, I left rubber on the road from a standstill I couldnt believe the throttle response, it REALLY pulls now. It feels like a throttle governor was removed.

    All in all, what an improvement. I also noticed that, even though I dropped the hammer twice, my average mpg’s were up from earlier today…lol. I think Im going to like this!

    Hats off to PCM, the really fast service, the excellent communications – emails are responded to immediately, and for "waking up" my Envoy!!

  2. 5 out of 5

    (verified owner):

    I have a 2003 GMC Envoy XL 4.2 A few years back I decided to put a few items to improve my performance. Got on a envoy trailblazer forum which leaded me to .So I mailed in my pcm and a week later, I installed it and wow this mf took off hell… So I also install a set of efans.. And oil cooler for the transmission for a trip to Mexico a 460 mile I race BMW X5 at over100 mph and won…no regret !! BEST INVESTMENT EVER.

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