2013-2017 Buick Encore & Chevy Trax Back Glass: Defrosters, Compatibility, and Replacement
This guide covers common back glass issues for the first-generation Buick Encore and Chevrolet Trax, from defroster failures to what you must check before buying a used replacement.
- This back glass fits the 2013-2017 Buick Encore and 2013-2020 Chevy Trax, but it does NOT fit the Buick Encore GX.
- When buying used, you must inspect the defroster grid lines and electrical tabs for damage, as a broken tab is very difficult to repair.
- Replacement is a job for professionals only; improper installation can lead to leaks, rust, and safety issues.
- If your defroster fails, check the fuse and relay first before assuming the glass itself is bad.
Key Compatibility Warning: Encore vs. Encore GX
Warning: This back glass fits the first-generation 2013-2017 Buick Encore and the related 2013-2020 Chevrolet Trax. It will NOT fit the redesigned Buick Encore GX, which is a different vehicle with different body panels and glass.
Symptoms of Back Glass Failure
Failure of the back glass can range from obvious breakage to more subtle electrical issues. Here’s what to look for:
1. Shattering or Cracking
The most obvious symptom is physical damage. Unlike a laminated windshield that cracks, tempered back glass is designed to shatter into many small pieces when it breaks. This can happen from an impact, such as from road debris or in a collision. Spontaneous shattering, while rare, can also occur due to thermal stress (rapid temperature changes) or microscopic flaws in the glass, though there are no specific recalls for this issue on the Encore.
2. Rear Defroster Not Working
If your rear defroster fails to clear frost or fog, the problem could be with the glass itself. The system relies on a complete electrical circuit running through the grid lines printed on the glass. A single broken line can cause a section of the defroster to fail, while a disconnected main tab will cause the entire system to stop working. Other causes can include a blown fuse, a bad relay, or a faulty dashboard switch.
3. Water Leaks or Wind Noise
Water leaking into the cargo area or excessive wind noise from the rear of the vehicle often points to a failed urethane seal around the glass. This is not a failure of the glass itself but of the adhesive holding it in place. It is almost always the result of an improper installation.
Known Issues, TSBs, and Recalls
As of mid-2026, there are no active recalls from the National Highway Traffic Safety Administration (NHTSA) specifically for the back glass on the 2013-2017 Buick Encore. While several recalls exist for this vehicle, they pertain to other systems like airbags and are not related to the glass.
General Motors has issued technical service bulletins (TSBs) related to rear defroster performance on other models, which often point to issues with the electrical connector tabs or grid lines. For example, TSB PIP5540J was issued for later model year Encores regarding defroster diagnosis. If you experience defroster issues, a diagnostic check of the grid and its connections is the first step.
Buying a Used 2013-2017 Encore Back Glass
A used OEM back glass is an excellent, cost-effective alternative to a new part, but a thorough inspection is crucial before you buy. OEM glass ensures a perfect fit and matches the original tint and defroster quality.
What to Inspect on a Used Part:
- Scratches and Chips: Run your hand over the entire surface. Minor surface scuffs are acceptable, but reject any glass with deep scratches that you can catch a fingernail on, as these can't be polished out and will obstruct vision. Pay close attention to the edges, as small chips here can compromise the glass's integrity.
- Defroster Grid Lines: Carefully inspect each horizontal line of the defroster grid. Look for any breaks, scratches, or areas where the line has been scraped off. A single break will cause that line to stop working.
- Electrical Connector Tabs: Locate the two main electrical tabs for the defroster, typically found on the left and right sides of the glass. Ensure they are firmly attached to the grid and not broken or pulled away. A broken tab is very difficult to repair reliably and usually means the defroster will not work.
- Tint and Markings: Verify the glass has the standard factory tint. Check the manufacturer markings (often in a lower corner) to confirm it is a genuine GM part.
Pro Tip: You can test the defroster grid's continuity with a multimeter. Set the multimeter to the resistance (Ohms) setting. Place one probe on the main electrical tab on one side of the glass and the other probe on the tab on the opposite side. A healthy grid should show a low resistance reading (typically between 1-10 ohms). An 'OL' or infinite reading indicates a complete break in the circuit.
Replacement Overview & Difficulty
Replacing a back glass is a complex job that should be left to professional auto glass technicians.
- Installation Difficulty: 5 out of 5 (Professional Recommended)
- DIY Feasible: No
The process involves using specialized tools to cut through the strong urethane adhesive that bonds the glass to the vehicle's body. The pinch weld (the metal frame where the glass sits) must be perfectly cleaned and prepared with special primers. A new bead of urethane is then applied, and the replacement glass is carefully set in place. An improper installation can lead to dangerous water leaks, rust, wind noise, and could even compromise the vehicle's structural integrity in a crash.
| Part/Service | Estimated Cost |
|---|---|
| New OEM (GM) | $500 - $780 |
| New Aftermarket | $200 - $350 |
| Used OEM | $125 - $200 |
| Shop Labor & Installation | $150 - $300 |
Technical Specifications & Part Numbers
This back glass is made of heated, tempered safety glass and includes the rear defroster grid.
| Part Number | Type | Notes |
|---|---|---|
| 42703083 | GM (OEM) | Current primary part number. |
| 95421860, 95371213, 95275144 | GM (OEM) | Superseded (older) part numbers. |
| DB12127GT, DB12127YPN | Aftermarket | Common aftermarket numbers. |
Frequently Asked Questions (FAQ)
Is the 2016 Buick Encore back glass the same as a 2016 Chevy Trax?
Yes, the back glass is interchangeable between the Buick Encore (2013-2017) and the Chevrolet Trax (2013-2020) as they are built on the same platform.
Can I repair a broken defroster line on my back glass?
Yes, it is possible to repair minor breaks in a defroster grid line using a special conductive repair kit available at most auto parts stores. However, if the main electrical tab has broken off the glass, a reliable repair is very difficult and replacement of the glass is often the best solution.
Why did my back glass shatter for no reason?
This is called spontaneous breakage and can happen to any tempered glass. It's usually caused by either a rapid and extreme change in temperature or a tiny, invisible flaw or chip (often near the edge) that creates a stress point. Over time, vehicle vibrations and temperature cycles can cause that stress point to release its energy, resulting in the glass shattering.
Is professional installation really necessary for a back glass?
Yes. Unlike a mechanical part, the back glass is a structural component bonded to the car. A proper seal is critical to prevent water leaks that can damage interior electronics and cause rust. Professionals have the correct tools to remove the old glass safely and the chemical primers and adhesives to ensure the new glass is bonded correctly for safety and longevity.
Technical Specifications
OEM Part Numbers: 42703083 95421860 95371213 95275144 42604055 42406251 42406246 95271780 95242026 42648033
Tempered safety glass with integrated heating element for defrost function.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Buick Encore:
- Key Compatibility Warning: Encore vs. Encore GX
- Symptoms of Back Glass Failure
- 1. Shattering or Cracking
- 2. Rear Defroster Not Working
- 3. Water Leaks or Wind Noise
- Known Issues, TSBs, and Recalls
- Buying a Used 2013-2017 Encore Back Glass
- What to Inspect on a Used Part:
- Replacement Overview & Difficulty
- Technical Specifications & Part Numbers
- Frequently Asked Questions (FAQ)
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