Installed new preprogram PCM now it cranks, no start?

Tiny
CHRYSLER 01
  • MEMBER
  • 2001 CHRYSLER TOWN AND COUNTRY
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 144,000 MILES
No crank no start, installed new preprogram PCM now it a crank no start. The fuel pump only comes if you jump it, still no start. No spark no power to ignition coil installed new plug and wire no.
Saturday, February 15th, 2025 AT 7:12 AM

44 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,192 POSTS
If the engine ran before the PCM swap it is not programmed correctly. Can I ask if the security light is flashing? If so, this will be the problem, you might want to try a hard system reboot.

This guide can help you:

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

I would also check the fuse # 16 and 17 in the fuse panel under the hood. Also, you might want to try swapping out the auto shut down relay as well. Check out the images (below). Please let us know what happens.

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Saturday, February 15th, 2025 AT 11:23 AM
Tiny
CHRYSLER 01
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Car was not starting before installing new PCM.
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Saturday, February 15th, 2025 AT 12:36 PM
Tiny
CHRYSLER 01
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No security light is not flashing.
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Saturday, February 15th, 2025 AT 12:37 PM
Tiny
CHRYSLER 01
  • MEMBER
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Asd fuse and fuel pump fuse has power.
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Saturday, February 15th, 2025 AT 1:13 PM
Tiny
CHRYSLER 01
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16 and 17 has power.
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Saturday, February 15th, 2025 AT 1:14 PM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
Fuel pump only come on when I ran a jumper wire to fuel pump relay 30 and 87.
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Sunday, February 16th, 2025 AT 5:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,192 POSTS
So the engine was not running and so you replaced the PCM?
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+1
Monday, February 17th, 2025 AT 8:52 AM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
Correct the only codes I got were p684 and p1282.
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Monday, February 17th, 2025 AT 10:35 AM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
The codes are p1684 and p1282 not p684.
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Monday, February 17th, 2025 AT 11:17 AM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
I have another car with a small crack in engine near oil pressure sensor, what's the best glue to try to seal it?
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Monday, February 17th, 2025 AT 11:19 AM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
I check fuel pressure and it has 50 PSI and a new fuel pump and new filter, new injector. 01 town and country
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Monday, February 17th, 2025 AT 11:22 AM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
I got spark now finally says scanner 9 sparks I just won't start.
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Monday, February 17th, 2025 AT 11:24 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,192 POSTS
How does the engine sound when cranking over? Can you upload a short video of the engine cranking so I can see if the engine has a problem? If not, we should do a compression test.

Here is a guide to help:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over this guide and get back to us.
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Tuesday, February 18th, 2025 AT 9:27 AM
Tiny
CHRYSLER 01
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How do I upload a video?
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Sunday, February 23rd, 2025 AT 7:57 PM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
Now I'm getting spark at the spark plug but not at the coil.
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Sunday, February 23rd, 2025 AT 7:58 PM
Tiny
CHRYSLER 01
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On my scanner it shows RPMs while cranking 4-400.
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Sunday, February 23rd, 2025 AT 8:03 PM
Tiny
KEN L
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Okay that is good this means the crankshaft sensor is working.

P1684 - Battery/PCM Power Interruption:

P1282 - Fuel Pump Relay Control Circuit Malfunction:

Do you still have these codes? I have seen the coil pack go bad and cause the intermitted spark issue. I would swap out the fuel pump relay and then clear the codes again. Take a video with your phone and upload it here in your response like an image. Check out the images (below). Please let us know what happens.
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Monday, February 24th, 2025 AT 11:28 AM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
I install a new coil I got from Amazon, still same getting RPM and no start. I smell a heavy fuel smell in the engine area.
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Monday, February 24th, 2025 AT 4:19 PM
Tiny
CHRYSLER 01
  • MEMBER
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Thanks for all you have done for me. I gladly appreciate it.
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Monday, February 24th, 2025 AT 4:21 PM
Tiny
CHRYSLER 01
  • MEMBER
  • 37 POSTS
My phone has issues uploading videos.
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Monday, February 24th, 2025 AT 4:22 PM

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