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The Chevy Trax is a small, affordable crossover, and like most small affordable crossovers, the transmission is the expensive part that people forget to maintain until it complains. The good news: most Trax transmission complaints are fluid- and maintenance-driven, and a lot of them are caught before they become a replacement. The important news: the Trax used two very different transmissions across its life, and the fix depends entirely on which one you have.
The dividing line is the 2024 redesign. First-generation Trax (2013-2022) uses a GM 6T40 six-speed automatic. The second-generation Trax (2024 and newer) moved to a CVT. Identify yours first, then read the section that applies.
Trax Transmission by Generation
| Model Years | Generation | Transmission | Main Weak Point |
|---|---|---|---|
| 2013-2022 | 1st gen | 6T40 6-speed automatic | Harsh/erratic shifts, torque converter shudder, fluid neglect |
| 2024-present | 2nd gen | CVT | Too new for a settled failure pattern; fluid discipline is critical |
There was no 2023 Trax in the US market; the nameplate paused for the model-year changeover. If someone lists a "2023 Trax," verify the actual build year and transmission before buying.
2013-2022 (6T40): The Common Complaints
The 6T40 is a widely used GM front-drive six-speed, also found in the Sonic, Cruze, Encore, and others. It is not a fragile transmission, but it has a few well-known behaviors on the Trax.
Harsh, erratic, or delayed shifts
The most common complaint. Shifts that bang, hunt between gears, or hesitate before engaging. On the 6T40, the usual suspects, in order of likelihood, are:
- Degraded fluid. The 6T40 is sensitive to fluid condition. Old or low fluid causes exactly these symptoms. A proper fluid and filter service is always step one.
- Valve body / shift solenoid issues. Sticking pressure-control or shift solenoids cause erratic and harsh shifts. Sometimes cleaned, often replaced.
- TCM software or a needed relearn. After a battery disconnect or fluid service the adaptive shift learning can be off until it relearns.
Do not jump to "the transmission is bad" on a harsh-shifting 6T40. Check and service the fluid first. A shocking number of these get condemned when a $150 service would have fixed them.
Check Dexron VI fluid
Torque converter shudder
A rhythmic vibration at a steady cruise, usually in the 40-55 mph range under light throttle, is the torque converter clutch shuddering. On the 6T40 this is frequently a fluid-quality issue first. A fresh fluid service resolves a meaningful share of them; if it does not, the converter or the TCC circuit needs attention.
Check engine light with a P0700 or shift solenoid code
The Trax will often store a P0700 (transmission control system) alongside a more specific code like a shift solenoid or pressure control code. The P0700 is just a pointer — read the companion code to find the real fault. A cheap scan tool tells you in two minutes whether you are chasing a solenoid or something bigger.
Check OBD2 scanners
2024-Plus (CVT): What to Know So Far
The redesigned Trax uses a CVT. It is too new to have a settled long-term failure record, but the rules for keeping any CVT alive apply from day one:
- Use only the specified CVT fluid. CVTs are ruined by the wrong fluid faster than almost any other mistake. Never substitute a generic "multi-vehicle CVT fluid" for the factory spec.
- Service the fluid on schedule, and sooner if you tow or run hot. Heat is the enemy of every CVT belt.
- Take a hesitation, whine, or shudder seriously early. On a CVT, small symptoms that get ignored tend to end in full replacement, not a cheap repair.
If you are shopping a used 2024+ Trax down the road, insist on fluid service records and drive it up a grade to feel for any hesitation or temperature warning.
Real Repair Costs
| Repair | Typical Cost (US) | Notes |
|---|---|---|
| Fluid and filter service (6T40) | $130 - $230 | First step for most complaints. Cheap insurance. |
| Shift solenoid replacement | $300 - $650 | Depends on which solenoid and labor access. |
| Valve body replacement | $700 - $1,300 | For persistent erratic-shift faults. |
| Torque converter replacement | $900 - $1,600 | If shudder is not fixed by fluid. |
| 6T40 rebuild | $2,200 - $3,500 | Independent shop; dealer is higher. |
| CVT replacement (2024+, reman/used) | $3,500 - $5,500 | CVTs are typically replaced, not rebuilt. |
The pattern is the same as every other vehicle on this site: the cheap, on-schedule fluid service is what keeps you out of the four-figure column. On a small crossover like the Trax, a transmission bill can approach the value of the car, so prevention matters even more.
Rebuilding a 6T40? Parts Ship Same-Day
If the Trax transmission is past the fluid stage and on the bench, our companion shop gearboxinsider.com stocks 6T40 rebuild kits, solenoids, valve body parts, and torque converters. Free shipping, same-day ship before 2pm Eastern.
Shop Gearbox Insider →Should You Fix It or Move On?
Because the Trax is an inexpensive vehicle, the math gets ugly fast when a repair climbs into rebuild or replacement territory. A rough rule of thumb:
- Fluid service, solenoid, or valve body fix: almost always worth doing on a Trax in otherwise good shape.
- Full rebuild or CVT replacement: compare the bill to what a clean used Trax (or a different small crossover) costs. If the transmission repair is more than half the car's value and the body and engine are tired, walking away is a legitimate choice.
Get a real diagnosis before deciding. Condemning a transmission over a shudder that a fluid service would have fixed is the most expensive mistake an owner makes.
FAQ
Is the Chevy Trax transmission reliable?
The 6T40 in the 2013-2022 Trax is reasonably reliable when the fluid is serviced. Most failures trace back to neglected fluid, not a design defect. The 2024+ CVT is too new to judge long-term, but demands strict fluid discipline.
What transmission fluid does the Trax use?
The 6T40 uses Dexron VI. The 2024+ CVT uses a specific GM CVT fluid — do not substitute a generic CVT fluid. Confirm the exact spec for your build year.
Why does my Trax shudder at highway speed?
Most often the torque converter clutch shuddering, frequently caused by degraded fluid on the 6T40. Try a proper fluid service before assuming the converter is bad.
What does the P0700 code mean on a Trax?
It is a general transmission control system code that points to a companion code. Read the specific code stored alongside it — that is the one that tells you what actually failed.