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P0717 code

Tiny
DAVE COWARDIN
  • MEMBER
  • 2012 CHEVROLET COLORADO
  • 3.7L
  • 5 CYL
  • 4WD
  • AUTOMATIC
  • 179,000 MILES
I am getting a P0717 transmission input shaft low reference message. I believe this indicates a bad ground to the TCM. I have seen a few fixes that involve taking the ground from both the TCM and the electrical connector at the transmission to a more suitable ground by splicing the wire and making an eyelet and running the wire at both ends to a suitable ground. Any ideas? Thanks. It's only doing a hard shift between first and second.
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Saturday, August 24th, 2019 AT 6:15 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

You get these codes when the input shaft sensor goes out. Here is a the location so you can replace it below:

1 - Converter Housing
2 - Reverse Input Clutch
3 - Input Clutch Housing
4 - Overrun Clutch
5 - Forward Clutch
6 - Forward Sprag Clutch Assembly
7 - 3-4 Clutch
8 - Input Planetary Gear Set
9 - Lo and Reverse Clutch
10 - Lo Roller Clutch Assembly
11 - Reaction Planetary Gear Set
12 - Speed Sensor
13 - Output Shaft
14 - Case Extension
15 - Main Section Case
16 - Parking Pawl
17 - Parking Lock Actuator Assembly
18 - Control Valve Assembly
19 - Manual Shaft
20 - Manual Shift Detent Lever with Shaft Position Switch Assembly
21 - 2-4 Band Assembly
22 - Pump Assembly
23 - Stator Roller Clutch
24 - Torque Converter Assembly
25 - Turbine Shaft

Check out the diagrams (below). Please let us know what happens.
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Monday, August 26th, 2019 AT 2:24 PM

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