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2007 chevy
486 Posts
Discussion Starter · #1 · (Edited)
Hi Guys, Kelly here from You may have heard of us on other websites - we do GM computer tuning.

We've been tuning for nearly 15 years now, specializing in GM performance. We offer tuning for almost every GM vehicle from 1986 & up, and also have a few specialty products as well. We've been working on the I6 & V8 trailblazers for a while - picking up where GM left off with them! We can help with more power, better driveability, and other issues such as errant highway shifting, and whatever else you need. Our gains on the I6 Trailblazer are about 10-14hp, and most of our customers see a 1-3mpg increase as well.

We can accommodate almost any modifications you have added to the vehicle. Overall, we aim for a better driving truck, whether you are at part throttle in the city, wide open on the highway, or just need more 'oomph' for hitting the trails!

Here are some of our most frequently asked questions on how our programming works. If you have more questions, you can either post them in this thread, email [email protected], or give me a call at 704-307-4227.

Thank you Trailvoy for having us!

1. Office Hours

9am-5pm Monday through Friday, eastern time. Our phone number is 704-307-4227.

2. What we do

We offer performance tuning (via mail order or in person) as well as many specialized products for the I6 & V8 trailblazers. Our prices are affordable and our modification is one of the best things you can do for your truck. We do full tuning of the PCM, including things such as air/fuel, timing, transmission settings, tire sizes, speedometer, rev limiter, and so on. From the factory, these trucks leave a lot on the table tuning-wise. GM does not know who will be towing, who’s using 93 octane and who’s using 87, who is hauling groceries, and who is racing at the track…thus, they have to set their factory tunes up conservatively so customers do not encounter problems. We basically pick up the slack and give you the truck you should have had from the factory. With our tune our customers see gains of 10-14hp at wide open throttle, better shifting, much more useable low-end grunt, and 1-3mpg depending on driving habits.

3. PCM tuning and your warranty

The PCM tuning may or may not void your warranty, it depends on your dealership. We have not encountered any issues with this. The PCM looks exactly the same on the outside.

4. Options for placing an order

We offer a few different ways to get tuned. The most straightforward way is to send your PCM into us for reflashing. However, we understand that not everyone has the liberty of being without their vehicle for a few days, so we also have other programs. In the core program, we send you a tuned PCM that you install. You can either keep both PCM’s, or remit your stock PCM and get your core charge back. Core charges vary by year and model, so check the website for your application. You need to get a CASE relearn (see #5) with the core program.

In the loaner program, first we send you a stock PCM that you install and ‘borrow’, while you send in your stock PCM. We then tune your stock PCM, and send it back, and you return your borrowed core. Since we are flashing your original PCM, you do NOT need a CASE relearn. When we receive our PCM back, you get your core charge back. You can keep the borrowed PCM and forgo the core charge, just keep in mind you would need a CASE relearn on that if you planned to run it for an extended period of time.

In the dashhawk loaner program (2008+ only) we send a set of tuned cores, along with a dashhawk to do your own CASE relearn with. You then return the dashhawk fore a credit. You can return your stock cores, or keep them. 2008 models have a PCM & a TCM (transmission control module).

5. The CASE relearn and you

CASE (Crank angle sensor relearn) information is stored in your PCM. If you use the core program, we set up a new ECM for you, which means rewriting the computer with your VIN and current calibration. When we use the GM software to do this, it erases the CASE data. Thus, when you install it into your vehicle in the core program, you need to have the CASE relearn done.

The CASE relearn can be done with a Tech 2 scan tool, high end scan tool, dashhawk (2008+) or Aeroforce Scangauge. The vehicle must be present – so we cannot do the CASE relearn for you here at the office for a mail order tune.

The CASE relearn itself is a simple procedure that only takes a few moments. A dealership or local shop may charge anywhere from zero dollars to over $80, so it may be wise to call ahead and ask before deciding on which one of our programs to use.

You need to have a CASE relearn done with the core program. On most core/loaner programs, the check engine light is disabled for the code as do not be an eyesore, but the code is still stored for it.

6. Security relearn

The security relearn is something that needs to be done with most cores and loaners. If you install the PCM and the vehicle does not start, you need to do it. If it starts, then you do not need it. You will not need it when installing your own PCM. Instructions are enclosed with the PCM – it is a ~35 minute process that can be completed by you in your driveway with no tools.

7. How to place an order

You can either order through the internet or over the phone. To order over the net, visit, and then click on Prices & Ordering. Select the appropriate vehicle, choose the right program, choose shipping, and click submit. It will walk you through the payment process of either a credit card or Paypal. After you have paid, you will be linked to the order sheet. Answer the questions about your truck and personal information, and click submit. After that your order is complete. If for some reason you get lost after paying for it, you can also find the order sheet on the top menu of our home page.

Please be advised that the address on your order sheet must match the address on your Paypal account. We ship to the Paypal address for seller protection, so please take a moment and confirm that address is correct before ordering. If it must be shipped elsewhere for some reason, please contact us about it as soon as possible when ordering.

8. Options on the order sheet

Most of the questions on the order sheet are straightforward. And YES we DO need the VIN for core/loaner programs!! Please do not leave this out as it makes for a delay when processing your order. Fill out the information to the best of your knowledge. Some points to mention:

Tire size – Only change these fields if you have changed tire size. If you still have the stock size, leave the order sheet to say “stock”. If you have changed tire size, we must have BOTH the stock size AND the aftermarket size in order to calibrate the speedometer.

Octane/fuel – Please select the octane level you are most comfortable using, as we will tune it based on that specification. There is a few extra hp to be had when going up in octane, but our regular tune is impressive enough – so don’t feel like you have to choose premium to see a gain. After selecting an octane, stick with it please.

Shift firmness – Based on 0-3. 0 is no change, 1 is a slight change in speed/firmness over stock, 2 is a noticeable difference, and 3 is a pretty harsh shift. We typically recommend ‘2’ for most daily drivers, as it is a nice increase over stock without being too firm. We do offer ‘3’ for those specifically looking for a harsh shift.

Rev limiter – You can specify your own, leave it up to us, or leave it alone.

Everything else is pretty self-explanatory, but if you have questions please email [email protected]

9. Turnaround time

Typically, our send-in PCM’s take priority. If you send your PCM in, we normally have it back out either the same day, or the very next day (providing its not a weekend).

Cores & loaners typically ship within a couple days of ordering, providing we are in stock. Most of the time we keep a healthy stockpile of PCMs, so the orders go out quickly.

If you need a PCM in a hurry please email or call first to check availability and schedule.

10. Getting your PCM to us

If you are sending in a stock/core/loaner I6/V8 PCM to us, the address is PCM of NC, 618 Oak Ridge Farm Hwy, Mooresville, NC 28115.

All major shippers (USPS, UPS, FedEx, DHL) ship to our office as a business address. It is your choice who to use. We use the UPS, so please be sure to provide a physical address and not a PO box.

2007 chevy
486 Posts
Discussion Starter · #2 · (Edited)

11. I have a problem with my PCM

If you are having any kind of problem with your PCM, we advise you to call or email us first – that is the quickest way to get in contact with us.

12. PCM of NC in person

If you are close to the Mooresville, NC area or passing through, you can also stop in to get tuned. It takes around 30 minutes. You must have an appointment, so please call first.

13. Core, loaner, and dashhawk fees

Please visit our website at to check our current pricing.

With any core program, you can keep your stock modules, or return for a core refund. Cores submitted for refund must be postmarked with 7 days of receiving our tune. They must be in good working order, and good aesthetic condition (no marks, dents, etc).
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