Introduction to the

GM 6L80
Presented By:
Steve Garrett
 6L80 (RPO MYC)
Introduction
The first of ten 6 speed automatics was introduced in the 2006 model year. The
6L80 (RPO MYC) is currently available in the Chevrolet Corvette, Cadillac XLR-V
and the Cadillac STS-V applications. The 6L80 was introduced into several “up
level” SUV applications for the 2007 model year. The new plant utilizes several
industry first technical innovations and production processes and is unlike any
other assembly plant in the world.
 6L80
Introduction
· RPO MYC
· Input torque capacity 430 lb ft ( 583 Nm)
· Output torque capacity 664 lb ft ( 900 Nm)
· Ratios
1st – 4.02-1
2nd – 2.36-1
3rd – 1.53-1
4th – 1.15-1
5th - .85-1
6th - .67-1
· Maximum shift speed 6500 RPM
· Maximum GVW 8600 lb
· Maximum GCVW 14000 lb
· PRNDL positions P, R, N, D, (S or M)
· 2 shift solenoids used (On/Off Design), SS1,SS2
· 6 PWM controlled pressure control solenoids, PCS, PCS1, PCS2, PCS3, PCS4,
PCS5, TCC
· 32 bit TCM (TEHCM) mounted internal to the transmission on the valve body
(Referred to as the “control solenoid valve assembly”) TCM (TEHCM) incorporates
Solenoids, pressure switches, TFT and it is bolted to the valve body using 6 bolts.
 6L80
Introduction
• EC3 Converter 300mm (Corvette) 258mm twin plate ( XLR-V and STS-V)
• Fluid required, Dexron VI
• Fluid capacity, 9.5L (10 qts.) model 6CDA, 9.7L (10.2 qts.) model 6CZA, 11.9 L
(12.6 qts.) model CYA
• Clutch to clutch shifts, 5 clutches, 1 sprag
• Planetary (Lepelltier) Output ( Dual pinion design)
• Vane style oil pump
• Internally mounted TISS and TOSS hall effect type speed sensors
• Internal Mode Switch (IMS) equipped
• Performance Algorithm Shifting (PAS) programming
• Performance Algorithm Lift Foot (PAL) programming
• Sport mode and TAP shift equipped
• Adaptive Strategies with fast learn capabilities
• 75 transmission only DTCs Learn diagnostic process used
 No Accumulators
 No Shift Valves
 Multifunctional Solenoids
 Backfill Circuits for the Clutches (Exhaust
Control)
 Compensator Circuits ( Clutch Release
control)
 Internal TCM
 Clutch to Clutch Shifts
* Reduced sump volumes
* Higher fluid turnover rates
* Increased energy densities
* Reduced cooling capacity
* Clutch to Clutch Shifting
* 50% improvement in film strength to
reduce wear
 Shear Stability

Wear Control Oxidation Stability

DEXRON®-IIIH
DEXRON®-IIIG
DEXRON®-VI

Film Strength Friction Durability

Foam/Aeration Control
 6L80
Checking the Fluid Level on Some passenger car applications
The 6L80 transmission utilizes a very unique process for checking the fluid
levels. Some 6L80 applications do not utilize a dipstick. Instead a plug has
been placed into the dipstick hole. The plug can be removed and the hole can
be used as a fill point for transmission fluid. To check the fluid level the
following procedure should be followed:
·The transmission temperature must be between 86-122 °F (30-50°C) a scan
tool, the driver information center or the transmission gauge can be used to
verify the temperature

·Start the engine and let it idle, Shift the transmission in and out of range
pausing in each range for approximately 3 seconds

·Place the transmission in park range

·With the vehicle level, remove the level control plug located in the
transmission oil pan

·If fluid does not drip from the level control hole, add Dexron VI fluid until fluid
starts to drip from the hole. If fluid runs from the hole wait until the fluid stops
running from the hole. The level is correct when fluid drips slightly from the
hole. If a steady stream is present or no flow is present the fluid level is
incorrect. Install the fill plug and the level control plug.
 6L80
Checking the Fluid Level
NOTE: Fluid may be added through the dipstick hole or through
the level control hole.

Level Control Plug and Stand

Pipe P
 6L80

Component Application Chart

TCM over temp protected
(142c) Thermal Shutdown
uses 2 thermal couples on NSBU/PRNDL/
the board. Default 3rd or IMS
5th Switch
Transmission Internal components

Solenoid Pack/Block
Assembly & TEHCM
 6L80
Shift and Control Solenoids
 2 ON/OFF SHIFT SOLENOIDS: N/C, GROUND SIDE
CONTROLLED
 3 VBS NORMALLY “LOW” SOLENOIDS, TCC, #4,#5
 3 VBS NORMALLY “HIGH” SOLENOIDS, PCS,#2,#3
 NORMALLY HIGH= SOLENOID OFF, PRESSURE IS
ALLOWED TO TRAVEL TO THE CLUTCH
 NORMALLY LOW= SOLENOID OFF, NO PRESSURE IS
ALLOWED TO TRAVEL TO THE CLUTCH
 VBS SOLENOIDS ARE “POSITIVE DUTY CYCLE”
CONTROLLED, 3000 HZ, 5.5 OHMS AT 70F, CURRENT
LIMITED TO .9A, SOLENOID FEED VOLTAGE REGULATED
FROM TCM IS 8.3-9.3 VOLTS
 Solenoid 1 and 2 are ON/OFF solenoids and are
used to control whether the transmission is in
Reverse or Forward
 VBS solenoids 2, 3, 4, and 5 control when a shift
occurs and how aggressive the shift is. Shift feel
is also controlled by the compensator circuit.
Solenoid cleaning cycle every 30 seconds while
in P/N or when you run the cleaning process
with the scan tool
 6L80
Control Solenoid Operation

SHIFT PRESSURE CONTROL SOLENOID ON = PRESSURIZED, OFF =

NO PRESSURE
SHIFT SOLENOIDS, ON = PRESSURIZED, OFF = NO PRESSURE
P
 6L80
Introduction
FILTER PLATE

Filter Plate: Must be replaced any time the TEHCM or Valve body
has been removed
 6L80

Pressure Switches
 6L80
IMS
 6L80
IMS Operation

High = 12 volts
Low = 0 volts

Not all applications

utilize all ranges shown
 6L80
Solenoid and Valve Body Diagnosis
Solenoid and valve body diagnosis requires the following tools:
· A quality scan tool capable of communicating and commanding the TCM and it’s solenoids.
· Tool number J 47825-1 Solenoid test plate and jumper harness

Remove the Control Solenoid Valve Assembly from the transmission. Install tool J47821-1 onto
the Control Solenoid Valve Assembly (5Nm 44 Lb In). Apply regulated shop air (90-100 psi) to
the tool. Connect the scan tool to the Control Solenoid Valve Assembly.
· Command the solenoid ON/OFF air pressure should be present on the gauge and then it
should exhaust as the solenoid is cycled. If the solenoid or valve are malfunctioning the gauge
pressure will not change as you cycle the solenoid. If a malfunction is determined to be
present, replace the complete Control Solenoid Valve Assembly.
· If the solenoid checked OK, install the gauge on another solenoid port and command that
solenoid ON/OFF with the scan to repeat the process.
 6L80
Solenoid and Valve Body Diagnosis

NOTE: The TEHCM will normally cycle several of the solenoids

ON/OFF to help keep the solenoids and the valves free of debris.
Therefore this cleaning function (Dither) may cause the gauge to
flicker when the TCM is cleaning the solenoid you are testing.
ISS/OSS
Input Test

1. Set the J 38522 Signal to 8 volts, the Frequency to 120 and the Percent Duty
Cycle to 50.
2. Ignition On, observe either the scan tool parameter ISS Signal or OSS
Signal.
3. The signal parameter should display between 100- 400 RPM.

23
 6L80
Adaptive Learning
The 6L80 is fully equipped with several adaptive learning strategies.
As with some other GM applications you will need to erase the
adaptive values and perform a “Fast Learn” prior to operating the
vehicle. Adapts and fast learn procedures should be perform if any
of the following occur:
· Internal Transmission repairs have been performed
· The valve body was replaced
· The Control Solenoid valve assembly was replaced
· The TCM was recalibrated
· Internal repairs were performed that could effect shift quality

NOTE: Fast learn is not required if a GM New or Rebuilt 6L80 is

used. The transmission is fast learned prior to it being shipped from
the plant
 6L80
Adaptive Learning (cont)
To perform a fast learn:
· Use a scan tool capable of performing the fast learn procedure
· TFT 158-230°F (70-110°C)
· Select Fast learn process from the scan tool menu
· Place the transmission in Drive with the vehicle stationary. The TEHCM
will individually apply the clutches and calculate the clutch volume
· Place the transmission in Reverse with the vehicle stationary. The
TEHCM will individually apply the clutches and calculate the clutch
volume
· Shut off the engine, power off the scanner
· The process is now complete

The fast learn procedure will not run if:

· DTCs are set
· TFT is not between 158-230 °F (70-110°C)
· The brake switch is not working
· TP is 0% but engine RPM increases during the test
· P/N switch is improperly adjusted or is not functioning correctly
· Line pressure control system malfunction
P
 6L80
Pass-thru Connector ID
 6L80
Pass-thru Connector Location
The pass through connector is located on the valve body and is a hard
connection to the solenoids. During disassembly of the valve body, use care in
the removal of the hard wire harness and connector.

Connector and Pass-

thru Sleeve
Thank you for Attending

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