2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2454
tool, ensure that each signal circuit displays LOW when connected to ground.
瀚慖f a signal circuit remains HI when connected to ground, replace the IMS harness.
瀚慖f a signal circuit other than the circuit being grounded displays LOW, replace the IMS harness.
瀚慖f all circuits test normal, replace the IMS.
Component Testing
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Important: Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (See: Transmission and
Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic
Transmission/Control Solenoid Valve and Transmission Control Module Assembly Inspection) for the following components before replacing
the components.
* Manual Shift Shaft Position Switch Replacement (See: Powertrain Management/Computers and Control Systems/Sensors and Switches -
Computers and Control Systems/Transmission Position Sensor/Switch/Service and Repair/2ML70 - Automatic Transmission) for IMS
replacement.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid (w/body and TCM) valve
assembly replacement, setup, and programming.
* Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Wiring Harness/Service and
Repair/Wiring Harness Replacement) for automatic transmission control wiring harness extension harness assembly replacement.
P1838
DTC P1824, P182A-P182F, P1838, or P1839
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 P1824
- Internal Mode Switch P Circuit High Voltage
DTC P182A
- Internal Mode Switch A Circuit Low Voltage
