Car starting but then stalls right out

Asked by Apr 15, 2017 at 04:46 AM about the 2000 Pontiac Grand Am GT

Question type: Maintenance & Repair

Have a Grand Am GT 2000
3400 and it I replace the
heater blower motor and
trans unplug the battery I
put the new motor in it
starts up and dies I replace
the crankshaft position
sensor black the ignition
lock cylinder and blue
program. It still starts up
and dies and my abs and
traction control lights are
on... Here are the codes
that came back on the OBD
read u1255 c1273 C1276
c1278 c1263 C1266 c1258
C1233

1 Answer

98,345

Odd you should not have any codes if you disconnected the battery, that resets the system back to factory default on this vehicle. The start and dying sounds like the security system is in full shut down, this happens if the vehicle looses battery power and is turned on as a default setting from the factory, refer to your owners manual for the correct procedure to turn off the security system and then see if it will start and run. If it does use a scan tool to reset the system and start from square one with diagnostics. If it doesn't then you may need to have the vehicle live data scanned too see what is causing the no start problem, could be a sensor misread or a bad sensor ground.

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