Will not start and code U0401

Tiny
ANGEL11022
  • MEMBER
  • 2012 CHRYSLER 200
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I am having an issue to getting the car started. I have changed the head gasket and put in new camshaft sensors. Cleared the codes but the check engine light won't come off and I see that I have a permanent code U0401 but don't know if that's the issue why my car won't start. I'm trying too see if it's my ECM. Any help?
Saturday, September 18th, 2021 AT 12:55 PM

7 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The code:
U0401-Implausible data received from ECM/PCM

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

This could be triggered due to the Anti-Lock Brake Module, the brake module controller area network (CAN) bus.
I have included the basic diagnostics for that code (look below).

As for no start what does it do? Does it crank? Are you getting fuel/spark?

Please let me know.
Thank you.
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Saturday, September 18th, 2021 AT 3:40 PM
Tiny
ANGEL11022
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  • 8 POSTS
I am getting crank but no start. I checked for fuel the fuel pump does seem to give out fuel and I do hear a hum. I check for spark and was getting long repeated spark. Shall I check my injectors?
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Saturday, September 18th, 2021 AT 5:00 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
You might first want to check the fuel pressure at the rails to make sure there is no restrictions.
It should have 58 PSI (+/- 5 PSI) fuel pressure with the key on.

https://youtu.be/aITQclp7zIE

Also what was the issue you had before all this. Did it stall on you? and you can't get it started?
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Saturday, September 18th, 2021 AT 8:09 PM
Tiny
ANGEL11022
  • MEMBER
  • 8 POSTS
My issue was that my engine overheated and had to change my gaskets and my sensors since they got fried, but since I left my car not running at all for the past 3 years I decided to get it moving again.
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Saturday, September 18th, 2021 AT 9:25 PM
Tiny
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  • MECHANIC
  • 6,383 POSTS
Got it. Well, it is good to know the history. As you know when a vehicle sits for an extended period of time, fuel system typically gives the most trouble. As some of the rubber components can get stiff or brittle. You could also have buildup of material in the sensors.
Let me know what you find with the fuel pressure.
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Saturday, September 18th, 2021 AT 9:33 PM
Tiny
ANGEL11022
  • MEMBER
  • 8 POSTS
Fuel pump gave almost 51 to 55 PSI, but took the fuel rail out and did a quick test and saw piston 2 fuel rail Is clogged. Does this car have any switches to deactivate or bypass to start the car by any chance? Also, I did a compression test, I got 90 PSI on my first 60 on my second, 60 on my third, and 50 on my last piston.
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Saturday, September 25th, 2021 AT 1:12 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Well, the fuel pressure is good. But there is no way to 'deactivate or bypass' to start the engine.

The compression low. It should be in 170 PSI range.
Low compression is another piece of the puzzle in a non-start situation.
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Saturday, September 25th, 2021 AT 3:43 PM

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