Cruze

DTC P182E or P1915

The internal mode switch (IMS) assembly is a sliding contact switch attached to the manual shift detent lever shaft inside 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. The IMS input parameters represented are transmission range Signal A, Signal B, Signal C, and Signal P.

P182E

P1915

P182E

The IMS does not indicate a valid Park, Reverse, Neutral, or Drive Range position for 7 seconds.

P1915

The manual shift shaft switch assembly does not indicate Park or Neutral during the following sequence:

DTCs P182E and P1915 are Type A DTCs.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-48616-10 Adapter Harness

For equivalent regional tools, refer to Special Tools .

1. Perform the Range Selector Lever Cable Adjustment procedure to verify correct adjustment.
2. Ignition ON, engine OFF, observe the scan tool TCM Internal Mode Switch 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 range that is selected. Refer to Transmission Internal Mode Switch Logic .
3. 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 .

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 .

Note: You must perform Circuit/System Verification first.

1. Remove the control valve body cover. Refer to Control Valve Body Cover Replacement : LNP → LLW .
2. Connect the vehicle wire harness X1 14-way transmission connector to the Q8 control solenoid valve assembly.
3. Disconnect the B15 IMS connector at the Q8 control solenoid valve assembly.
4. Ignition ON, verify the scan tool TCM Internal Mode Switch A/B/C/P parameter displays High for all 4 signal circuits.

⇒	If not the specified value, replace the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .

5. Connect a 3-amp fused jumper wire between each transmission range signal circuit terminal listed below and the B15 IMS ground circuit, terminal F on the Q8 control solenoid valve assembly X2 connector. The appropriate scan tool IMS A/B/C/P parameter should display Low when the terminal is connected to the IMS ground.

•	Switch Signal A: terminal B to ground circuit terminal F

•	Switch Signal B: terminal C to ground circuit terminal F

•	Switch Signal C: terminal D to ground circuit terminal F

•	Switch Signal P: terminal E to ground circuit terminal F

⇒	If not the specified value, replace the Q8 control solenoid valve assembly.

6. If all circuits test normal, replace the B15 IMS. Refer to Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.