6T70/6T75 - Automatic Transmission
DTC P182E or P1915
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P182E
- Internal Mode Switch - Invalid Range
DTC P1915
- Internal Mode Switch Start/Wrong Range
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The manual shift detent lever with shaft position switch assembly, or internal mode switch (IMS) assembly is a sliding contact switch attached to the manual shift detent lever within the transmission. The 4 inputs to the transmission control module (TCM) from the switch indicate which position is selected by the transmission manual shaft. The input voltage at the TCM is high when the switch is open and low when the switch is closed to ground. The state of each input is displayed on the scan tool as IMS A/B/C/P. The IMS input parameters represented are transmission range signal A, signal B, signal C, and signal P.
Conditions for Running the DTC
P182E
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0722, or P0723 is not set.
* The engine speed is 400 RPM or greater for 5 seconds.
* The ignition voltage is 8.6 volts or greater.
* The engine torque signal is valid.
P1915
* DTC P0722 or P0723 is not set.
* The transmission output shaft speed is 90 RPM or less.
* The ignition voltage is 6.0 volts or greater.
Conditions for Setting the DTC
P182E
The IMS does not indicate a valid Park, Reverse, Neutral or Drive Range gear position for 7 seconds.
P1915
The IMS does not indicate Park or Neutral during the following sequence:
* The engine speed is less than 50 RPM for more than 0.25 second.
* The engine speed is 50-480 RPM for more than 0.07 second.
* The engine speed is greater than 525 RPM for more than 3.25 seconds.
Action Taken When the DTC Sets
* DTCs P182E and P1915 are Type A DTCs.
* The TCM commands maximum line pressure.
* The TCM turns OFF all solenoids.
* The TCM freezes transmission adaptive functions.
* The TCM defaults the transmission to third gear if the current gear is 1st, 2nd, or 3rd; or fifth gear if the current gear is 4th, 5th, or 6th gear.
* The TCM turns OFF the high side driver.
* The TCM inhibits Tap Up/Down function.
* The TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DTC
DTCs P182E and P1915 are Type A DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Connector End Views By Name
* Inline Harness Connector End Views Connector Views
Description and Operation
* Transmission General Description Transmission General Description
* Electronic Component Description Electronic Component Description for manual shift detent lever with shaft position switch assembly
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Perform the Range Selector Lever Cable Adjustment Adjustments procedure to verify proper adjustment.
2. Ignition ON, engine OFF, observe the scan tool engine control module (ECM) PNP Switch parameter while moving the gear shift lever from Park to Reverse, and through all the ranges. The parameter should display Park/Neutral in the Park and Neutral positions, and In Gear in all other positions.
• If not the expected results, refer to DTC P0850-P0852.
3. Observe the scan tool IMS A/B/C/P parameter while moving the gear shift lever from Park, to Reverse and through all the ranges. The parameter should match each gear range that is selected. Refer to Transmission Internal Mode Switch Logic Transmission Internal Mode Switch Logic.
4. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
Note: You must perform Circuit/System Verification first.
Note: Under certain driving conditions, DTC P182E could set due to an intermittent low voltage fault on the park/neutral signal circuit, before conditions for setting DTC P0851 are met.
1. Ignition OFF, remove the control valve body cover.
2. Connect the vehicle wire harness X1 20-way transmission connector to the control solenoid valve assembly.
3. Disconnect the IMS connector X2 at the control solenoid valve assembly.
4. Ignition ON, verify the scan tool IMS A/B/C/P parameter displays HI for all 4 signal circuits.
• If not the specified value, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
5. Connect a 3-amp fused jumper wire between each transmission range signal circuit terminal listed below and the IMS ground circuit, terminal A on the control solenoid valve assembly. The corresponding scan tool IMS A/B/C/P parameter should display LOW when terminal E, D, C, or B is connected to terminal A.
* Switch Signal A terminal E to ground circuit terminal A.
* Switch Signal B terminal D to ground circuit terminal A.
* Switch Signal C terminal C to ground circuit terminal A.
* Switch Signal P terminal B to ground circuit terminal A.
• If not the specified value, replace the control solenoid valve assembly.
6. If all circuits test normal, replace the transmission internal mode switch.
Repair Instructions
Note:
* Perform the Reset Transmission Adapts Programming and Relearning following all transmission related repairs.
* Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Component Tests and General Diagnostics before replacing the TCM.
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement Service and Repair
* Range Selector Lever Cable Adjustment Adjustments
* Control Module References Control Module References for ECM or control solenoid valve assembly replacement, setup, and programming