One problem related to battery has been reported for the 2003 Toyota Tundra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Toyota Tundra based on all problems reported for the 2003 Tundra.
Battery drains with all electrical components shut off. If vehicle left sitting much over one week it will completely drain the battery to the point that it will no longer hold a charge. I've replaced the battery 5 times in one year and finally put a quick disconnect on the negative battery post. I've had Toyota look at it twice and they say there is nothing wrong.
| Wiring problems | |
| Horn Assembly problems | |
| Battery problems | |
| Electrical System problems | |
| Ignition problems |