GMC Envoy 4.2L I6 Mail Order Tune

(3 customer reviews)


    • 0 $
    • 0 $
    • 115 $
    • 135 $
    • 199 $
    • 219 $
    • 190 $
    • 210 $
    • 240 $
    • 260 $


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.

How to mail in your ECM – CLICK HERE.

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 × 8 × 4 in

3 reviews for GMC Envoy 4.2L I6 Mail Order Tune

  1. Mich

    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. kyle mladic (verified owner)

    Very impressed. Took me awhile to get the security relearned sometimes you have to do it a different way than the instructions state. Envoy is a whole new animal power wise it almost feels like I swapped In a 5.3 v8! It’s close to one! My two main topics that are exceptional, The transmission shifts the way I always wanted it To. A far cry from the way it was factory. Second is gas mileage. I drive about 75 miles per day round trip to work and back. Mostly backroads 55-60mph and I am now getting 24-25mpg. Havent had it on the highway yet but I expect to see it surpass 24/25 on the highway as before the tune I only saw above 20 on the interstate for long trips.

  3. Brandon Davis (verified owner)

    I am extremely happy with my mail order tune for my 02′ Envoy. Everything about the way the truck performs now is far above my expectations. To say that I am pleased is an understatement. The truck idles smoother, accelerates faster and harder. The shift points are very nice and truck feels like it damnwants to boogie and DOES..HIGHLY recommend this for you Atlas powered Trailblazer or Envoy.

Only logged in customers who have purchased this product may leave a review.