Transmission control module

Tiny
TJ LADUCER
  • MEMBER
  • 2009 CADILLAC SRX
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 190,200 MILES
My car will shift good from first gear all the way up to third gear when it reaches fourth it goes right into neutral, then don’t want to up-shift at all. When I switch it to manual to shift the gear the fourth gear goes into neutral as well. Today 1, 2, 3 gears are starting to do the same thing. They all go into neutral. When I shut the car off then start it back up it shift all the way up to third fine then starts acting up after driving for 5 minutes. Any one know what they would be? I’ve been told it would possibly be the Transmission Control Module. The vehicle has 109,200 miles.
Friday, September 6th, 2019 AT 8:32 PM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good morning,

Are there any codes set in the system? You can have a parts store read them for free.

How long since you changed the fluid and filter?

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

I would start with that. Beyond that, you have an internal failure and the transmission will have to be replaced.

https://www.2carpros.com/articles/automatic-transmission-problems

Roy
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Saturday, September 7th, 2019 AT 7:41 AM
Tiny
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  • 7 POSTS
It is code P0700.
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Saturday, September 7th, 2019 AT 8:19 AM
Tiny
TJ LADUCER
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  • 7 POSTS
Says transmission control system mil request.
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Saturday, September 7th, 2019 AT 8:20 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Okay, that means there is a fault code. I need that code.

Roy
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Saturday, September 7th, 2019 AT 9:32 AM
Tiny
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The code is p0700.
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Saturday, September 7th, 2019 AT 12:35 PM
Tiny
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  • MEMBER
  • 7 POSTS
Also codes P2138 and P0796.
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Saturday, September 7th, 2019 AT 12:36 PM
Tiny
TJ LADUCER
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P2138.
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Saturday, September 7th, 2019 AT 12:38 PM
Tiny
TJ LADUCER
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  • 7 POSTS
P0700.
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Saturday, September 7th, 2019 AT 12:39 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Okay, the 2138 is for the APP sensor which is on the floor. It is the gas pedal.

Checks need to be done to verify the failure.

Roy
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Saturday, September 7th, 2019 AT 4:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
796

Okay, there is a list of possibilities below and all these need to be checked.

Roy

P0796
Descriptor
Probable Causes
1-2-3-4 Clutch Backing Plate Retaining Ring Seated Incorrectly
4-5-6 Clutch Housing Broken Hub Weld
Clutch Pressure Control Solenoid 3 Valve
Control Solenoid With Body and Transmission Control Module (TCM) Valve Assembly
Control Valve Upper Body Assembly Valves Stuck, Damaged, Scored Bores or Debris
Fluid Pump Cover Vanes
Internal Hub Spline Damaged
Low and Reverse or 4-5-6 Clutch Assembly
Lower Control Valve Body Clutch Select Valve
Torque Converter Assembly
Transmission Fluid Pump
Transmission Fluid and Filter
Valve Body Filter Plate Assembly
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Saturday, September 7th, 2019 AT 4:33 PM

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