anti theft is flashing and wont start?

2003 ISUZU RODEO
291,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CALVIN W HARRISON
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  • 1 POST
Truck was doing fine, grandson had been driving it and one day when he was leaving to return home, no start. everything works other than the obc2 port is dead and the anti theft light is flashing and want start. the starter will turn over at the fuse, but no start with or without the keys.
Dec 1, 2025 at 3:18 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
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This sounds like the ignition switch is bad, does the fuse # 2 (data connector) fuse have power? Please use this guide to help us see if the ALDL, (data link) connector has power.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

I would try doing a hard system reboot as well to help to help reset the security system. This video will show you how

https://www.youtube.com/watch?v=INiDRO5A5MY

Please upload a short video in your response of the problem, so I can see what's going on :) Please go over these guides and get back to us.
Dec 2, 2025 at 10:04 AM
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