Pontiac · Known Issues

1991 Pontiac Trans Am Problems: 1 Known Issue

1991 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated November 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1991 Pontiac Trans Am has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. Across all issues with published estimates, repair costs range from $150 to $600. DIY maintenance guides at au7o.io.

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On the 1990-1999 Pontiac Trans Am, t-top-equipped Trans Am/Firebirds (both 3rd-gen 1990-1992 and 4th-gen 1993-1999) commonly develop water leaks as the rubber seals age. The most frequent source is the U-shaped molding/weatherstrip around the top rear corner of the glass, which flattens and loses its shape after years of sun exposure and no longer seals against the glass, producing the classic wet-shoulder leak in heavy rain. Leaks can also drip into the interior and, over time, contribute to floor-pan moisture. It is an age/wear issue rather than a defect, but it is nearly universal on high-mileage T-top cars.

This issue also affects: Chevrolet Camaro, Chevrolet Corvette, Pontiac Firebird

Common Symptoms

Water dripping onto shoulder/interior in rain
Wet carpet or floor pan
Wind noise from roof at speed
Visibly flattened or cracked T-top seals

How to Fix

Replace the T-top and roof-rail weatherstripping with new reproduction seals (widely available from F-body/Firebird specialists), clean and re-seat the moldings, verify the T-top panels are properly adjusted/latched, and confirm the roof drain channels are clear.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

Firebird Central WEA-144K six-piece T-top weatherstrip kit
1990-1992 Pontiac Firebird/Trans Am with factory T-tops within this record; select the original rubber or plastic drip-edge design. Not for aftermarket T-tops or 1993-up cars.
Firebird Central
Firebird Central WEA-6 T-top door/body-frame weatherstrip pair
1993-1999 Pontiac Firebird/Trans Am with factory T-tops within this record; pair for left and right body/door frames. Panel-mounted seals are separate WEA-16.
Firebird Central
Firebird Central WEA-16 T-top panel side-rail seal pair
1993-1999 Pontiac Firebird/Trans Am factory T-tops within this record; pair for both removable panels. Does not replace the body/opening pair.
Firebird Central

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Typical repair cost:$150 - $600

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High ConfidenceVerifiedUpdated Nov 7, 2026

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Frequently Asked Questions

What are the most common Pontiac Trans Am problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1991 Pontiac Trans Am has 1 documented issue. The documented issue is: T-top and roof weatherstrip leaks. None are rated critical, but regular maintenance is recommended.

Is the Pontiac Trans Am reliable?

The 1991 Pontiac Trans Am has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Pontiac Trans Am problems?

Repair costs for known Pontiac Trans Am issues range from $150 to $600, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 1990-1999 Pontiac Trans Am T-top and roof weatherstrip leaks?

T-top-equipped Trans Am/Firebirds (both 3rd-gen 1990-1992 and 4th-gen 1993-1999) commonly develop water leaks as the rubber seals age. The most frequent source is the U-shaped molding/weatherstrip around the top rear corner of the glass, which flattens and loses its shape after y… Repairs typically run $150-$600. Severity: low.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.