Stuck in limp home mode?

Tiny
RYAN05300C
  • MEMBER
  • 2005 CHRYSLER 300
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Car starts fine now runs fine but won't go over 40 MPH. I've put a new wire harness on. A new PCM programmed to VIN. New abs sensors, all new wheel bearings all 4 wheels, abs tone rings, two new rear cv axels with new abs tone rings, transmission conductor plate new solenoids. Didn't work so put in whole new transmission valve guide and conductor plate with more new solenoids. Still stuck in limp mode. I am exhausted and knowledge spent on trying to fix this car. 05 300 c please help.
Thursday, January 30th, 2025 AT 11:29 PM

2 Replies

Tiny
STEVE W.
  • MECHANIC
  • 15,046 POSTS
Run a scan on it and see what codes are present. Post those here and we will try to help. Most of the time a limp mode is engine related but there are about 50 different codes that will lock it into limp mode if they set.
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Friday, January 31st, 2025 AT 12:21 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 53,431 POSTS
Yep I agree with Steve, we need the codes to see which direction to go in the help you fix the car, please go over these guides to get us started.

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

and this guide as well:

https://www.2carpros.com/articles/reduced-power-limp-mode

Please go over these guides and get back to us.
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Tuesday, February 4th, 2025 AT 8:34 AM

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Reduced Power - Limp Mode
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The com­puter sys­tem that con­trols your car has a built in safety fea­ture called "Re­duced Power" or "Limp Mode" which is de­signed to get the car where it is...
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