Grand Cherokee 2WD V6-3.7L (2008)
When the TCM detects that system voltage has dropped below 8.5 volts, it disables voltage-dependant diagnostics and places the transmission in the
temporary Limp-In Mode. When the TCM senses that the voltage has risen above 9.0 volts, normal transmission operation is resumed.
Hardware Error Mode
When the TCM detects a major internal error, the transmission is placed in the permanent Limp-In Mode and ceases all communication over the CAN
bus. When the TCM has entered this mode normal transmission operation does not resume until all DTCs are cleared from the TCM.
Loss of Drive
If the TCM detects a situation that has resulted or may result in a catastrophic engine or transmission problem, the transmission is placed in the neutral
position. Improper Ratio, Input Sensor Overspeed or Engine Overspeed DTCs cause the loss of drive.
Controlled Limp-in Mode
When a failure does not require the TCM to shut down the solenoid supply, but the failure is severe enough that the TCM places the transmission into a
predefined gear, there are several shift performance concerns. For instance, if the transmission is slipping, the controller tries to place the transmission
into 3rd gear and maintain 3rd gear for all forward drive conditions.
