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Home >> Buick >> 2010 >> Allure AWD (CANADA) V6-3.0L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1915 >> 6T30/6T40/6T45 - Automatic Transmission

6T30/6T40/6T45 - 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 - Indicates Invalid Range

DTC P1915
- Internal Mode Switch Does Not Indicate Park/Neutral During Start

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

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.

Conditions for Running the DTC

P182E
* The engine speed is greater than 500 RPM for 5 seconds.
* The ignition voltage is 9.0 volts.
* No DTCs 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.

P1915
* No DTCs P0722, P0723, or P1915.
* The transmission output shaft speed is less than 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 manual shift shaft switch assembly does not indicate Park or Neutral during the following sequence:

* The engine speed is less than 50 RPM for greater than 0.10 second.
* The engine speed is 50-480 RPM for greater than 0.07 second.
* The engine speed is greater than 500 RPM for greater than 1.25 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 limits the transmission to reverse and 5th gear.
* The TCM forces the torque converter clutch (TCC) OFF.
* The TCM inhibits the Tap Up/Tap Down function.
* The TCM inhibits manual shifting of forward gears.
* The TCM turns the high side driver OFF.

Conditions for Clearing the DTC

DTCs P182E and P1915 are Type A DTCs.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference

* Component Connector End Views (Connector Views)
* Inline Harness Connector End Views (Connector End Views By Number)

Description and Operation

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System 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 (Programming and Relearning) 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 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 gear range that is selected. Refer to Transmission Internal Mode Switch Logic (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.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: You must perform Circuit/System Verification first.

1. Ignition OFF, disconnect the 14-way harness connector at the transmission.

Note: Under certain driving conditions, DTC P182E could set due to an intermittent low voltage fault on the P/N signal circuit, before conditions for setting DTC P0851 are met.

2. Ignition ON, verify the scan tool ECM PNP Switch parameter displays In Gear.

• If not the specified value, test the P/N signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

3. Ignition OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement (Control Valve Body Cover Replacement).
4. Connect the TCM harness connector.
5. Disconnect the IMS connector at the control solenoid valve assembly.
6. Ignition ON, verify the scan tool Internal Mode Switch A/B/C/P parameter displays High 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 (6T30/6T40/6T45 - Automatic Transmission).

7. Connect a 3-amp fused jumper wire between each transmission range signal circuit terminal listed below and the IMS ground circuit, terminal A. 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 E
* Switch Signal B terminal D
* Switch Signal C terminal C
* Switch Signal P terminal B

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

8. If all circuits test normal, replace the IMS.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).

* Refer to Control Module References (Programming and Relearning) for control solenoid valve assembly replacement, setup, and programming.
* Perform the Transmission Adaptive Values Learn (6T30/6T40/6T45 - Automatic Transmission) following all transmission related repairs.
* For IMS replacement, perform the Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (6T30/6T40/6T45 - Automatic Transmission).

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