Free Transmission Diagnosis in Denver: What’s Actually Checked (and Why It’s Free)

Why would a shop diagnose your transmission for free?

It sounds like a gimmick, so let’s be direct about the business logic. A free diagnosis filters out the cars that don’t need us – the engine misfires, the clogged catalytic converter, the failing battery that mimics transmission trouble. That costs us inspection time, but it earns something more valuable: when we tell a customer their $4,000 problem is actually a $200 problem, they remember it. They come back when it really is the transmission, and they tell people. A shop that charges $150 to look has already started monetizing you before knowing what’s wrong.

What the TrueTest™ inspection actually checks

• Fluid condition and level – color, smell, and debris tell us more than most code readers
• Computer scan – pulling transmission and engine codes, and interpreting them together
• Road test – how the transmission behaves under real load, shifting through every gear
• Physical inspection – mounts, linkage, CV axles, U-joints, transfer case, and leak points
• External checks first – battery, sensors, and electrical issues that imitate transmission failure

The order matters: external and electrical causes get ruled out before anyone talks about opening the transmission. That sequence is what separates a diagnosis from a sales pitch.

Free diagnosis vs. a parts-store code scan

A free code scan at a parts store reads what the computer says. It cannot road-test the vehicle, check fluid condition, or distinguish a $90 solenoid from internal clutch wear – codes only point to symptoms, not root causes. A code scan is a starting clue. A diagnosis is a conclusion you can make a decision on.

What about getting the car to the shop?

If your transmission won’t move the car, towing cost can trap you into the nearest shop instead of the right one. ATC offers free towing on major in-house repairs so a dead transmission doesn’t force a rushed decision.

Frequently Asked Questions

Is the free diagnosis really free, with no obligation?

Yes. The TrueTest™ inspection costs nothing and you’re under no obligation to repair with us. You’ll get a clear explanation of what we found and an electronic estimate sent to you before any work is approved.

How long does a free transmission diagnosis take?

Most TrueTest™ inspections are completed the same day, often within a few hours depending on shop volume. Call ahead and we’ll give you a realistic window.

Will you pressure me into a rebuild?

No – and the numbers back it up: a meaningful share of vehicles that come in for ‘transmission problems’ leave with a smaller repair or none at all. We are the only AAA-approved transmission shops in Colorado; that approval depends on not upselling. 

Do I need an appointment?

Yes, you will need an appointment.  We schedule so that you drop your vehicle off with us at 8am when we open and we can let you know what we find by that afternoon.