luvlake

Has anyone heard of TSB 070730015, NHTSA #10021845. I have an 08 Vert, should I take it in to have this addressed?

DJ07Vette

ADIBELC6

--------------------------------------------------------------------------------

#07-07-30-015: 6T70, 6T75, 6L50, 6L80 or 6L90 Automatic Transmission - Information on Transmission Fluid Pressure (TFP) Switch Check for False DTCs P0842, P0843, P0872, P0873, P0877, P0878, P0989 or P0990 - (May 24, 2007)


Subject: 6T70, 6T75, 6L50, 6L80 or 6L90 Automatic Transmission -- Information on Transmission Fluid Pressure (TFP) Switch Check For False DTCs P0842, P0843, P0872, P0873, P0877, P0878, P0989 or P0990


Models: 2008 Buick Enclave

2007 GMC Acadia

2007 Pontiac G6

2007 Saturn AURA, OUTLOOK

with 6T70 or 6T75 Automatic Transmission (RPOs MH2, MH4, MH6, MY9)



2006 Cadillac STS-V, XLR-V

2007 Cadillac Escalade, Escalade ESV, Escalade EXT, SRX, STS, STS-V, XLR, XLR-V

2006-2007 Chevrolet Corvette

2007 Chevrolet Silverado

2007 GMC Sierra, Yukon Denali, Yukon Denali XL

with 6L50, 6L80, or 6L90 Automatic Transmission (RPOs MYB, MYC, MYD)




--------------------------------------------------------------------------------

During diagnosis of various transmission symptoms and diagnostic codes, technicians may see DTCs P0842, P0843, P0872, P0873, P0877, P0878, P0989 or P0990 indicating an issue with transmission fluid pressure (TFP) switches.

During normal use, the TFP switches may stick from time to time causing a code to set. This is to be considered normal as switch outputs are only used for shift adaptives and do not cause transmission symptoms unless the switch is failed for a long period of time.

To determine if the TFP switch is functioning correctly, clear the code and perform the following check.

Important: The Tech 2® must contain version 27.007 or later.

Turn the key to the "ON" position (do not start), apply parking brake and put vehicle in neutral.
Plug the Tech 2® into the ALDL and turn power on.
Press "enter" on the Tech 2® to get to the first menu.
Select "Diagnostics" from the first menu.
From the following screens, build the vehicle.
Select "Powertrain."
Select the correct engine.
Select "Transmission Control Module."
Select "Special Functions."
Select "Shift Transmission."
Important: Make sure to wait for at least 5 seconds in each gear state for the TFPs to stabilize.

Scroll down until you can see all pressure switch state variables (TFP 1, 3, 4 and 5). All switches should read "LOW" at key on (in neutral). Refer to the table below.
Apply the foot brake, start the vehicle leaving it in neutral and compare the switch states to row 2 of the table. Make sure to allow enough time for the switches to stabilize.
With the brakes applied, place the shifter in drive (D) (IMS Drive 6) and shift the transmission into 2nd gear using the Tech 2® soft key (upshift or downshift). The commanded gear is displayed at the top of the screen. Compare with variables in the table.
Keep the vehicle in drive (D) (IMS Drive 6) and shift to 5th gear using the Tech 2® soft key (upshift or downshift). Compare with variables in the table.
If the TFP switch states match the values in the table for all listed gear states, the switches are functioning correctly. Any switch codes that set were caused by an intermittent condition that will not cause transmission related driveability concerns.

Commanded Gear
TFP Switch 1

P0842 (LOW)

P0843 (HIGH)
TFP Switch 3

P0872 (LOW)

P0873 (HIGH)
TFP Switch 4

P0877 (LOW)

P0878 (HIGH)
TFP Switch 5

P0989 (LOW)

P0990 (HIGH)

N -- Key Off
LOW
LOW
LOW
LOW

N -- Engine On
HIGH
LOW
LOW
LOW

2
HIGH
LOW
LOW
HIGH

5
LOW
HIGH
HIGH
LOW


Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

K9514*
Clear Code and Perform Transmission Fluid Pressure (TFP) Switch Check
0.3 hr

* This is a unique labor operation number for bulletin use only. This number will not be published in the Labor Time Guide.

Marc V.

Only have it addressed if you are having trans symptoms.