6T30/6T40/6T45 - Automatic Transmission
DTC P2723 or P2724
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 P2723
- Clutch Pressure Control (PC) Solenoid 5 - Stuck Off
DTC P2724
- Clutch Pressure Control (PC) Solenoid 5 - Stuck On
Circuit/System Description
The clutch pressure control (PC) solenoid 5 is part of the control solenoid valve assembly, which has no serviceable components. The PC solenoid 5 regulates transmission fluid pressure (TFP) to the 1-2-3-4 regulator valve which controls pressure to the 1-2-3-4 clutch. The transmission control module (TCM) calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.
Conditions for Running the DTC
P2723
* No ISS DTCs P0121, P0122, P0123, P0716, P0717, P0722, P0723, or P182E.
* The ignition voltage is between 9.0 volts and 18.0 volts.
* The engine speed is 500 RPM or greater for 5 seconds.
* The transmission output speed is greater than 650 RPM or throttle position is above 1 percent.
P2724 - Dynamic
* No DTC P182E.
* The transmission fluid temperature is greater than 0°C (32°F).
* First range is not commanded.
* The transmission OSS is 350 RPM or greater.
* The transmission ISS is 200 RPM or greater.
Steady State
* No DTC P182E.
* The ignition voltage is between 9.0 volts and 18.0 volts.
* The engine speed is greater than 500 RPM for 5 seconds.
Conditions for Setting the DTC
P2723
The TCM detects an incorrect ON-coming clutch gear ratio or shift flare.
P2724
The TCM detects an incorrect OFF-going clutch gear ratio or shift tie-up.
Action Taken When the DTC Sets
P2723
* DTC P2723 is a type A DTC.
* The TCM freezes transmission adaptive functions.
* The TCM limits the transmission to reverse and fifth range.
* The TCM inhibits TCC.
* The TCM inhibits Tap Up/Tap Down.
* The TCM inhibits Manual Up/Manual Down with the gear selector.
* Torque management is enabled.
P2724
* DTC P2724 is a type A DTC.
* The TCM freezes transmission adaptive functions.
* The TCM limits the transmission to reverse, first, and third ranges.
* The TCM inhibits Tap Up/Tap Down.
* The TCM inhibits Manual Up/Manual Down with the gear selector.
* Torque management is enabled.
Conditions for Clearing the DIC/DTC
DTCs P2723 and P2724 are type A DTCs.
Diagnostic Aids
Before performing a road test, configure and setup the scan tool for snapshot mode. This allows you to monitor, display, and verify multiple transmission data parameters at one time, after the road test.
Reference Information
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 Hydraulic Schematic reference and description, refer to:
* Drive Range, First Gear (First Gear)
* Drive Range, Second Gear (Second Gear)
* Drive Range, Third Gear (Third Gear)
* Drive Range - Fourth Gear (Fourth Gear)
* Drive Range, Fifth Gear (Fifth Gear)
* Drive Range, Fifth Gear Default (Fifth Gear Default)
* Drive Range, Sixth Gear (Sixth Gear)
Connector End View Reference
* Component Connector End Views (Connector End Views By Name)
* Inline Harness Connector End Views (Connector End Views By Number)
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
Special Tools
* DT-48616 Control Solenoid Test Plate
* DT-48616-10 Adapter Harness
* J 21867 Pressure Gauge
Circuit/System Verification
Note: If other DTCs are set, diagnose those DTCs first.
1. Perform the Transmission Fluid Level and Condition Check (Transmission Fluid Level and Condition Check) to verify correct fluid level and condition.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning (Control Solenoid Valve and Transmission Control Module Assembly Cleaning) to dislodge debris and free up the valves.
3. Perform the Road Test (6T30/6T40/6T45 - Automatic Transmission). Verify with a scan tool, the TFP Switch 4 parameter changed states when the clutch PC solenoid 5 was commanded ON. Also, verify with a scan tool, the Transmission ISS/OSS parameters are not erratic.
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.
Warning: Refer to Parking Brake and Drive Wheels Warning (Parking Brake and Drive Wheels Warning).
Note: If other DTCs are set, diagnose those DTC s first.
5. Engine idling in Park, with parking brake applied and drive wheels chocked.
6. Perform the Transmission Fluid Level and Condition Check (Transmission Fluid Level and Condition Check), to verify correct fluid level and condition.
7. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning (Control Solenoid Valve and Transmission Control Module Assembly Cleaning), to dislodge debris and free up the valves.
8. Monitor the TFP switch 4 with a scan tool. Place the gear select lever in Park, Reverse, and Neutral range. Verify the TFP switch 4 parameter states are correct for Park, Reverse, and Neutral. Refer to Transmission Fluid Pressure Switch Logic (Transmission Fluid Pressure Switch Logic).
9. Place the gear select lever in Drive range. Command the shift transmission with a scan tool through all forward ranges. Verify the TFP switch 4 parameter states are correct for all forward ranges. Refer to Transmission Fluid Pressure Switch Logic (Transmission Fluid Pressure Switch Logic).
10. Engine idling in Park, verify with a scan tool the ISS/OSS Supply Voltage parameter displays OK.
11. Engine idling in Park. Observe the Transmission ISS parameter on the scan tool, while varying the engine speed. The Transmission ISS parameter should vary with engine speed and not drop out.
12. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission OSS parameter on the scan tool. The Transmission OSS parameter should vary with the vehicle speed and not drop out.
Note: Perform a Tech 2 snapshot, during the road test.
13. Perform the Road Test (6T30/6T40/6T45 - Automatic Transmission). Verify the transmission operation performs as indicated in the road test instructions.
14. Review the Tech 2 snapshot data. Verify the following transmission data parameters display the correct values for each gear range.
* Transmission ISS
* Transmission OSS
* PC Solenoid 5
* TFP Switch 4
15. 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 the Circuit/System Verification first.
1. Perform the Line Pressure Check (Line Pressure Check). Verify the transmission line pressures are within the range specified in the Line PC Solenoid Valve Pressure table. Refer to Solenoid Valve Pressure (Solenoid Valve Pressure).
• If not within the specified range, refer to Fluid Pressure High or Low (Fluid Pressure High or Low).
2. Ignition OFF, remove the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement (Service and Repair).
3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test).
• If the control solenoid valve assembly does not pass the performance test, replace the control solenoid valve assembly.
4. Inspect for the following conditions and repair or replace as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Important: 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 Service Fast Learn Adapts (6T30/6T40/6T45 - Automatic Transmission) following all transmission related repairs.