2003 Toyota Tundra Problems: 1 Issues Every Owner Should Know
2003 model year · 50,000+ owner reports · Updated April 2026
According to Au7o's analysis of 50,000+ owner reports, the 2003 Toyota Tundra has 1 documented known issues, with 1 rated critical. The most serious is Frame Rust and Corrosion ($500-$15,000 repair). The most commonly reported issue is Frame Rust and Corrosion with 50,000 owner reports. Across all issues, repair costs range from $500 to $15,000. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2000-2008 Toyota Tundra, toyota Tundra trucks from 2000-2008 are affected by a widespread frame rust issue, particularly in regions where corrosive road salt is used. The frames develop excessive rust on the rear cross member. This can lead to spare tire separation, compromised brake lines, and damage to the proportioning valve. Toyota faced a $3 billion class-action settlement in 2016.
Common Symptoms
- Visible rust on frame cross members
- Rust flakes falling from undercarriage
- Spare tire mounting bracket deterioration
- Brake line corrosion
- Frame perforation near rear axle
How to Fix
Toyota dealers will inspect the rear cross member and related components including brake lines, and replace as necessary. For affected vehicles, Toyota may apply rust-resistant coating, repair rusted areas, or replace the entire frame. Out-of-warranty frame replacement can cost $10,000-$15,000. Preventive undercoating and regular inspections are recommended.
What Owners Are Using
Parts and tips from 50,000+ owners who fixed this issue
- TipDIY repairs can save significantly - dealer charges $10,000-$15,000 but DIY costs are typically 50-70% less
- TipPreventive undercoating and regular inspections are recommended.
- NoteThis is a high-severity issue - ignoring it can lead to costly repairs or safety concerns. Address it promptly.
- TipGet a proper diagnosis before replacing parts - similar symptoms can have different causes
- UpgradePOR-15 rust preventive coating stops rust permanently (POR-15 Rust Preventive Coating)
- UpgradeRust-Oleum rust converter spray for treating corroded panels (Rust-Oleum Rust Converter Spray)