Gear sometimes engages throughout driving but other times disengages?

DAVID DAVO ESSIEN

MEMBER
2005 CHRYSLER 300
3.7L
V6
TURBO
AUTOMATIC
150,728 MILES

Whenever I click on read codes, I've tried it for 4 different consecutive times the car instrument cluster rpm clock would spontaneously surge high to about 2.5 RPMs and drops with a great speed to 0 within a twinkle of an eye and engine would stall immediately.
The symptoms of the car were a gear that wouldn't select and a hard start. p0700 and p0888 codes are more common even after succeeding to clear the codes. The stalling stopped when I did all system scan and I also noticed that when it was processing, at about 98% for the all system scan, the was an actuation at the throttle body, and PCM? Please, what could be responsible for that cars problem and how can I fix it?
https://drive.google.com/file/d/1D_iPR4nKEoF-mg73Q8jDNKFrn0qnbRpb/view?usp=drivesdk

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3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,960 POSTS

The code says there is a transmission control relay that is not working, let's swap it out and clear the codes to see if that fixes it.

The P0888 code in a 2005 Chrysler 300 is a diagnostic trouble code (DTC) related to the Transmission Control Module (TCM) Power Relay Sense Circuit. Essentially, this code indicates that the TCM has detected a problem with the transmission relay control circuit.

Here is the relay location, also let's check all of the fuses with the key on:

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

Check out the images (below). Please let us know what happens.

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Wednesday, January 24th, 2024 AT 11:13 AM

DAVID DAVO ESSIEN

MEMBER
143 POSTS

Where is the TCM located in that particular brand and how can the connector be tested to verify that it is faulty or not? Client complained that sometimes if that occurs and he swaps a particular relay from engine bay TIPM, it sometimes engages. How can that TIPM issue be solved? Please upload the photo of the location and repair guide for TCM to me from either mitchell1 or Alldata, voltage values, resistance values, etc.

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Thursday, January 25th, 2024 AT 12:15 PM

KEN L

MASTER CERTIFIED MECHANIC
42,960 POSTS

They don't give us that, plus most of them will change when in operation, to test the TIPM or the TCM you need specialized equipment. You can test the power and ground or do a CAN scan which will point to any problem the system may have.
You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here is a CAN scanner on Amazon for about $134.00 if you need it. They have cheaper and more professional units as well; this one is the middle of the road.

https://amzn.to/3ZYCA1P

Here is the location of the TCM and how to change out the IPM which is easy because it is plug and play. Check out the images (below). Please upload pictures or videos in your response of the problem so we can see what's going on.

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