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P182A




DTC P182A, P182C-P182F, 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 Descriptor
DTC P182A
- Internal Mode Switch A Circuit Low Voltage

DTC P182C
- Internal Mode Switch B Circuit High Voltage

DTC P182D
- Internal Mode Switch P Circuit Low Voltage

DTC P182E
- Internal Mode Switch - Invalid Range

DTC P182F
- Internal Mode Switch C Circuit High Voltage

DTC P1915
- Internal Mode Switch Does Not Indicate Park/Neutral (P/N) During Start

Diagnostic Fault Information





Circuit Description

The internal mode switch (IMS)/transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is internally mounted on the transmission manual shaft. The IMS/TR switch contains four internal switches that indicate the transmission gear range selector lever position. The transmission control module (TCM) or powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The TCM/PCM detects the selected gear range by deciphering the combination of the voltage signals. The TCM/PCM compares the actual voltage combination of the switch signals to an IMS/TR switch combination chart stored in memory.

The PNP switch contains one internal switch that indicates the transmission gear range selector lever position when in Park and Neutral. The engine control module (ECM)/PCM supplies ignition voltage to the PNP switch circuit. As the gear range selector lever is moved, the state of the PNP switch changes, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The ECM/PCM detects the Park and Neutral ranges by voltage signal.

Conditions for Running the DTC

P182A, P182C, P182D, P182E
* No engine torque signal DTC P2637.
* The engine run time is greater than 5 seconds.
* The engine torque is 55-450 Nm (41-332 lb ft).
* The IMS indicates Park/Neutral for at least 1 second.

P182F
* No output speed sensor (OSS) DTCs P0722 or P0723.
* No engine torque signal DTC P2637.
* Vehicle speed is greater than 16 km/h (10 mph).
* The engine torque is greater than 50 Nm (37 lb ft).
* The IMS indicates Park/Neutral for at least 1 second.
* DTC P1826 has not passed during the current ignition cycle.
* The gear ratio is within one of the following ranges:

- 3.33:1 to 3.50:1 for first gear
- 2.16:1 to 2.27:1 for second gear
- 1.56:1 to 1.64:1 for third gear
- 0.98:1 to 1.03:1 for fourth gear

P1915
* The engine is cranking for more than 2.5 seconds.
* The engine speed is greater than 500 RPM.
* 1st gear request for 7 minutes.

Conditions for Setting the DTC

P182A, P182C, P182D
* The switch indicates PARK for 1 second, then;
* The switch indicates a transitional state for greater than 8 seconds.

P182E

The TCM detects an invalid switch range for 8 seconds.

P182F

The TCM detects Signal C is high for 8 seconds.

P1915

The IMS Range is not equal to Park/Neutral for greater than 2 seconds.

Action Taken When the DTC Sets

* DTCs P182A, P182C, P182D, P182E, P182F, P1915 are Type B DTCs.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM assumes a D4 shift pattern.

Conditions for Clearing the DTC

DTCs P182A, P182C, P182D, P182E, P182F, P1915 are Type B DTCs.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (4L60-E/4L65-E/4L70-E - Automatic Transmission)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Transmission General Information (Transmission General Information)
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

Transmission Control Module Scan Tool Information (4L60-E) (Transmission Control Module Scan Tool Information (4L60-E)) Transmission Control Module Scan Tool Information (6L45/6L50/6L80/6L90) (Transmission Control Module Scan Tool Information (6L45/6L50/6L80/6L90))
Special Tools

* J 35616 GM-Approved Terminal Test Kit
* J 44152 Jumper Harness (20 Pins)

Circuit/System Verification

Start and idle the engine. Using the scan tool, observe the IMS A/B/C/P parameter. The scan tool should display LOW/HI/HI/LOW. Move the gear selector through all ranges and ensure the IMS A/B/C/P parameter matches the gear selector for each selected range.

Circuit/System Testing

1. Using the scan tool, does the IMS A/B/C/P parameter display HI/HI/HI/HI for each range selected.

• If the IMS A/B/C/P parameter displays HI/HI/HI/HI for each range selected, repair the open in the IMS ground circuit.

2. Turn OFF the ignition. Disconnect the automatic transmission inline 20-way connector. Additional DTCs may set. Turn ON the ignition, with the engine OFF. Observe the IMS A/B/C/P parameter on the scan tool. The parameter should display HI/HI.

• If the IMS A/B/C/P parameter does not display HI/HI/HI/HI, repair the short to ground in the TR signal circuit that displayed LOW between the TCM and the automatic transmission 20-way inline connector.

3. Turn OFF the ignition. Install the J 44152 jumper harness (20 pins), on the engine side of the automatic transmission inline 20-way connector. Turn ON the ignition, with the engine OFF. Using the DMM and the J 35616 GM terminal test kit, measure the voltage at each of the TR signal circuits at the J 44152.

• If the voltage is less than battery voltage, test the affected TR signal for an open between the TCM and the automatic transmission 20-way inline connector.

4. Turn OFF the ignition. Install the J 44152 on the transmission side of the automatic transmission inline 20-way connector. Measure the resistance for each TR signal circuit between the J 44152 circuit and the transmission case. The resistance should be greater than 10 ohms.

• If the resistance is less than 10 ohms, test the affected TR signal for a short to ground between the automatic transmission 20-way inline connector and the IMS switch.

5. Connect the automatic transmission 20-way inline connector. Turn ON the ignition, with the engine OFF. Place the range selector in D3. Observe the IMS A/B/C/P parameter on the scan tool. The IMS A/B/C/P parameter should display LOW/LOW/LOW/LOW.

• If any of the TR signal circuits do not display LOW when the range selector is placed in D3, test the affected TR signal for an open or high resistance between the automatic transmission 20-way inline connector and the IMS switch.

6. If all circuits and connections test normal, test or replace the IMS switch.

Component Testing

1. Disconnect the automatic transmission inline 20-way connector. Install the J 44152 on the transmission side of the connector and use J 35616. Referencing Transmission Internal Mode Switch Logic, test for continuity between the IMS ground circuit and each TR signal circuit at the transmission side of the automatic transmission inline 20-way connector, when Transmission Internal Mode Switch Logic indicates the signal circuit should be LOW.

• If any TR signal circuits do not display continuity when the table indicates it should be LOW, test the affected TR signal circuit for an open or high resistance between the automatic transmission inline 20-way connector and the IMS switch.

2. Measure the resistance between each of the TR signal circuits and the transmission case. The resistance should be greater than 10 ohms.

• If any of the TR signal circuits display less than 10 ohms, test the affected TR signal for a short to ground.

3. If all circuits and connections test normal and the IMS switch tests normal, replace the TCM switch.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

Control Module References (Programming and Relearning) for TCM replacement, setup, and programming

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