Crank no start

124,789 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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GILBERT R MORA
  • MEMBER
  • 1 POST
Replaced fuel pump, new coil, module, spark plugs, wires, injectors. ran great for a few days then back to square one; cranks but does not start. did the by pass and did the relearn process security light off did not start. tried to do the relearn process, security lights does not turn off, 30 minutes pass still on 40 minutes passed lights stay on engine cranks but does not start and security is on. disconnected battery for 25 minutes, connected cable back engine started let it run for ten minutes turned off. came back later it cranked but no start.
Nov 15, 2020 at 1:47 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
Okay. So is the theft light back on? Sounds like the passlock sensor is not picking the key up. So when you reset the system is works but fails again. Let's start with checking for codes.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If there are no codes then we are going to need going through the wiring diagram to see what the issue is but I suspect you will have one of the B codes shown. Then we can follow that to figure out the issue. Thanks
Nov 16, 2020 at 6:39 AM
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