2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1762
DTC P16F2
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P16F2
- Control Module Transmission Direction Range Switch
Typical Scan Tool Data
Circuit/System Description
The internal mode switch (IMS) assembly is a sliding contact switch attached to the control valve body within the transmission. The nine outputs
from the switch indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P), are range selection inputs to the
transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid powertrain control module
(HPCM). The input voltage at the module is high when the switch is open and low when the switch is closed to ground.
The HPCM compares the requested direction to other data to verify that the indicated direction range switch calculation is correct.
Conditions for Running the DTC
* The ignition is ON.
* Ignition voltage is 8-18 volts.
Conditions for Setting the DTC
Condition 1
* No IMS direction switch DTCs are set.
* A valid IMS direction indicated by the IMS switch does not match the direction indicated by the HPCM software.
Condition 2
* No IMS direction switch DTCs are set.
* Two valid IMS directions are indicated at the same time.
Condition 3
* One IMS direction switch circuit has failed.
* The HPCM calculates a transmission direction based upon the remaining IMS circuits but it does not match the direction indicated by the
