Transmission replaced three times, but vehicle drives slowly on forward and reverse?

2014 NISSAN SENTRA

45,678 MILES • 2.5L • 4 CYL • 2WD • AUTOMATIC

MALLYBOY

MEMBER
327 POSTS
FOLLOW

Fault codes:

P0890-TCM POWER RELAY SENSE CIRCUIT LOW,
P0744-TORQUE CONVERTER CLUTCH INTERMITTENT,
P0603:ECM KEEP ALIVE MEMORY(BACK UP CIRCUIT),
U0100:LOST COMMUNICATION WITH ECM/PCM A,
P0868:FLUID PRESSURE LOW

How do I troubleshoot these and where's TCM relay located?

Jul 31, 2023 at 12:42 PM

STRAILER

CERTIFIED EXPERT
53,855 POSTS

Here is the transmission wiring diagrams and there is no TCM control relay. I would think the problem is with the TCM itself, did you check the power ground and fuses?

This guide can help:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

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

Images (Click to enlarge)