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Bad PCM possibly

Tiny
B.J. HILL
  • MEMBER
  • 2010 CHRYSLER 300
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Cylinder one misfire. Changed coil packs and plugs. That code went away. Then started with stalling out. Had to drive it like a stick so it wouldn’t cut off. Now it’s showing signs of a bad alternator but if it sits for a while it’s like it rejuvenated and I can crank it up without jumping it.
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Sunday, February 2nd, 2020 AT 12:12 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

Do you have any codes set? They will help me narrow the area of failure.

You need to check the charging system voltage while the engine is running to see if the system is working correctly.

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

As far as the stalling, check the throttle body for any carbon build up on the plate.

https://www.2carpros.com/articles/stall-at-idle

https://www.2carpros.com/articles/throttle-actuator-service

Roy
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Sunday, February 2nd, 2020 AT 3:54 AM
Tiny
B.J. HILL
  • MEMBER
  • 5 POSTS
Codes that are set but go away.
1128
1129
0622
2503
2173
0562
0121
1110
0571

I’ve switched the crankshaft sensor a week ago. What’s the possibility of it being the PCM? And is there an actual way to check the PCM.
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Sunday, February 2nd, 2020 AT 9:21 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Can you please give me the letter in front of the code?

It would be a P, B, C or U.

Roy
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Monday, February 3rd, 2020 AT 4:33 AM
Tiny
B.J. HILL
  • MEMBER
  • 5 POSTS
P.
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Monday, February 3rd, 2020 AT 6:48 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, that is a lot of codes.

Try this. Clear all the codes as see what returns first.

The PCM is common to most of them but needs to be confirmed. You will need an advanced scan tool to monitor all these systems t see if they are being controlled by the PCM.

110 does not show up. Can you confirm that code?

I attached possible issues for all the codes below.

Roy
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Monday, February 3rd, 2020 AT 7:06 AM
Tiny
B.J. HILL
  • MEMBER
  • 5 POSTS
Okay. I just tested the alternator. The voltage off was 11.8. Engine running and accessories on it dropped to 11.4. I also could be the problem. I went to to test the alternator the old way and unhook the negative terminal while car was running. I read that if done on newer cars that it could short out the PCM.
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Monday, February 3rd, 2020 AT 8:13 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, that never was and never will be a test for the alternator. You cannot remove the cable with the engine running. You will damage electronics with that move.

The alternators require battery voltage to operate. By removing the cable, it will never work.

Roy
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Monday, February 3rd, 2020 AT 8:19 AM
Tiny
B.J. HILL
  • MEMBER
  • 5 POSTS
So would you say the alternator or PCM?
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Monday, February 3rd, 2020 AT 10:37 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
With all the issues you have, I would say the PCM.

Roy
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Monday, February 3rd, 2020 AT 2:44 PM

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