P0203 only after warm start.
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Junior Member
Joined: Oct 2022
Posts: 3
From: Ohio
P0203 only after warm start.
2009 Chrysler 300 3.5.
I can drive the car all day long just fine as long as I do not shut it off. If I shut off the engine and immediately restart, no problem as well as starting the car 2 hours later. No codes.
If I start the car 5 minutes after shutdown or an hour after shutdown I get a P0203 and a miss on cylinder 3.
replaced injector #3
swapped ignition 3 coil from another cylinder
ohmed from output of PCM (pin 7) on C2 to PCM (pin 12) injector control of C2 on PCM. All readings consistent with other cylinders. This sure seems like a heat issue with the PCM to me. But how to prove it before ordering a PCM and possible waste of $?
thanks!!
I can drive the car all day long just fine as long as I do not shut it off. If I shut off the engine and immediately restart, no problem as well as starting the car 2 hours later. No codes.
If I start the car 5 minutes after shutdown or an hour after shutdown I get a P0203 and a miss on cylinder 3.
replaced injector #3
swapped ignition 3 coil from another cylinder
ohmed from output of PCM (pin 7) on C2 to PCM (pin 12) injector control of C2 on PCM. All readings consistent with other cylinders. This sure seems like a heat issue with the PCM to me. But how to prove it before ordering a PCM and possible waste of $?
thanks!!
Junior Member
Joined: Dec 2024
Posts: 1
2009 Chrysler 300 3.5.
I can drive the car all day long just fine as long as I do not shut it off. If I shut off the engine and immediately restart, no problem as well as starting the car 2 hours later. No codes.
If I start the car 5 minutes after shutdown or an hour after shutdown I get a P0203 and a miss on cylinder 3.
replaced injector #3
swapped ignition 3 coil from another cylinder
ohmed from output of PCM (pin 7) on C2 to PCM (pin 12) injector control of C2 on PCM. All readings consistent with other cylinders. This sure seems like a heat issue with the PCM to me. But how to prove it before ordering a PCM and possible waste of $?
thanks!!
I can drive the car all day long just fine as long as I do not shut it off. If I shut off the engine and immediately restart, no problem as well as starting the car 2 hours later. No codes.
If I start the car 5 minutes after shutdown or an hour after shutdown I get a P0203 and a miss on cylinder 3.
replaced injector #3
swapped ignition 3 coil from another cylinder
ohmed from output of PCM (pin 7) on C2 to PCM (pin 12) injector control of C2 on PCM. All readings consistent with other cylinders. This sure seems like a heat issue with the PCM to me. But how to prove it before ordering a PCM and possible waste of $?
thanks!!
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