| Subject: | Information On 2009 M30 4L60E, M32 4L65E and M70 4L70E HYDRA-MATIC® RWD Four Speed Automatic Transmission Controls Product Update |
| Models: | 2009 Chevrolet Avalanche, Colorado, Express, Silverado, Tahoe, TrailBlazer, TrailBlazer SS |
| 2009 GMC Canyon, Envoy, Envoy Denali, Savana, Sierra, Yukon |
| Equipped with HYDRA-MATIC® 4L60E, 4L65E, 4L70E Four Speed RWD Automatic Transmission (RPOs M30, M32, M70) |
For the 2009 model year, there are several controls changes to the 4L60E, 4L65E and 4L70E. The valve body casting has been changed andwill not back service
due to the removal of the following components:
Pressure Switch Manifold (PSM) (1)
3-2 Control Solenoid and the valve line up (1)
- A new Internal Mode Switch (IMS) has been added (2). The PSM has been deleted.
| • | Do not
reuse the roll pin that retains the IMS (2) to the manual shaft (3). |
| • | Do not
remove the ‘‘C" clip from the IMS (2). This will damage the part. |
- The manual shaft (3) has been redesigned to accommodate the IMS (2).
- The actuator rod (1) is a new design and will back service
. It has a flat on the rod to accommodate the IMS (2).
The wiring harness has been changed and now has the temperature sensor (2) in the harness with a gray connector. Both the 20-way connector (1) and the 6-pin connector for the IMS are now blue in color (3).
The following are new DTCs that have been added for the IMS:
| • | P1820 - Internal Mode Switch A Circuit Low Voltage |
| • | P1822 - Internal Mode Switch B Circuit High Voltage |
| • | P1823 - Internal Mode Switch P Circuit Low Voltage |
| • | P1825 - Internal Mode Switch Invalid-Range |
| • | P1826 - Internal Mode Switch C Circuit High Voltage |
| • | P1915 - Internal Mode Switch Does Not Indicate Park/Neutral (P/N) During Start |
All repair procedures are in 2009 Service Information (SI). The DTCs and oil circuit's changes are also available in SI.
