P2723
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
- Pressure Control (PC) Solenoid 5 - Stuck Off
DTC P2724
- Pressure Control (PC) Solenoid 5 - Stuck On
Circuit/System Description
Pressure control solenoid 5 is part of the control solenoid valve assembly which has no serviceable components. Pressure control solenoid 5 regulates the transmission fluid pressure to the 1-2-3-4 clutch regulator valve, which controls pressure to the 1-2-3-4 clutch. The transmission control module (TCM) calculates gear ratio based on the speed signals from the input shaft speed (ISS) sensor and the output shaft speed (OSS) sensor. The TCM compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.
Conditions for Running the DTC
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, or P182E is not set.
* Ignition voltage is greater than 8.5 V.
* High side driver is enabled.
* Output speed is 36 RPM or greater, or the throttle position is 0.5 % or greater.
* Throttle position signal is valid.
* Engine speed is 400-7,500 RPM for 5 s.
* Transmission fluid temperature is -6.7°C (20°F) or greater.
Conditions for Setting the DTC
P2723
TCM has detected an incorrect gear ratio or neutral condition when the 1-2-3-4 clutch is commanded ON. This condition must occur 3 times.
P2724
TCM has detected an incorrect gear ratio change when the 1-2-3-4 clutch is commanded OFF during a shift. This condition must occur 3 times.
Action Taken When the DTC Sets
P2723
* DTC P2723 is a Type A DTC.
* TCM freezes transmission adaptive functions.
* TCM commands maximum line pressure.
* TCM inhibits Tap Up/Down function.
* TCM inhibits manual shifting of forward gears.
* Torque management is enabled.
* TCM inhibits auto grade braking.
* TCM limits the transmission to Reverse and fifth gear operation.
P2724
* DTC P2724 is a Type A DTC.
* TCM freezes transmission adaptive functions.
* TCM commands maximum line pressure.
* TCM inhibits Tap Up/Down function.
* TCM inhibits manual shifting of forward gears.
* TCM inhibits auto grade braking.
* TCM limits the transmission to Reverse, first, or third gear operation.
Conditions for Clearing the 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 will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views A/C Compressor Clutch
* Inline Harness Connector End Views X100
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
* Drive Range, First Gear Engine Braking Drive Range, First Gear Engine Braking
* Drive Range, Second Gear Drive Range, Second Gear
* Drive Range, Third Gear Drive Range, Third Gear
* Drive Range - Fourth Gear Drive Range - Fourth Gear
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
Warning: Refer to Parking Brake and Drive Wheels Warning Parking Brake and Drive Wheels Warning.
Note: If other DTCs are set, diagnose those DTCs first.
1. Engine idling, transmission in Park, with parking brake applied and drive wheels chocked.
2. Verify the transmission fluid level and condition is correct. Refer to Transmission Fluid Level and Condition Check Transmission Fluid Level and Condition Check.
• If the transmission fluid level and condition is not correct
Repair as necessary.
• If the transmission fluid level and condition is correct
3. Ignition ON, clear the TCM DTCs with a scan tool
4. Verify DTC P2723 or P2724 does not set while performing a road test. Refer to Road Test Initial Inspection and Diagnostic Overview.
• If DTC P2723 or P2724 sets
Refer to Circuit/System Testing.
• If DTC P2723 or P2724 does not set
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame//Failure Records data.
6. Verify the does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
7. All OK.
Circuit/System Testing
1. Engine idling at the normal operating temperature.
2. Verify the transmission line pressures are within the specified range. Refer to Line Pressure Check Line Pressure Check and Solenoid Valve Pressure Solenoid Valve Pressure.
• If the pressures are not within range
Refer to Fluid Pressure High or Low Fluid Pressure High or Low.
• If the pressures are within range
3. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
4. Verify the pressure changes for all solenoids when performing the solenoid test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.
• If the pressure change does not occur
Replace the Q8 Control Solenoid Valve Assembly.
• If the pressure changes
5. Verify the conditions listed below do not exist. Repair or replace as necessary.
DTC P2723 Control Valve Upper Body Assembly
Manual shift detent (w/shaft position switch) lever assembly not engaged with manual shaft.
DTC P2723 Control Valve Upper Body Assembly
Clutch select valve 3 stuck OFF from debris, binding, damaged valve, or scored bore.
DTC P2723 or P2724 Lower Control Valve Body Assembly
* Actuator feed limit circuit supply fluid to solenoid restricted or not available from debris or sediment blockage.
* 1-2-3-4 clutch boost valve binding or scored bore which can also cause harsh shifts.
* 1-2-3-4 clutch regulator valve stuck/sticking from debris, binding, damaged valve, or scored bore.
DTC P2723 or P2724 Control Solenoid Valve Assembly
* Clutch pressure control solenoid 5 stuck ON or stuck OFF.
* Clutch pressure control solenoid 2 stuck OFF.
* Control solenoid filter plate assembly blocked, or damaged gasket seal.
DTC P2723 Channel Plate and Spacer Plate
Channel plate and spacer plate oil channels or orifices blocked by debris.
DTC P2723 1-2-3-4 Clutch Assembly
* 1-2-3-4 clutch piston cracked/damaged/leaking.
* 1-2-3-4 clutch backing plate retaining ring not seated/oriented, causing clutch pack/piston over travel.
DTC P2723 Low and Reverse Clutch Assembly
* Low and reverse clutch assembly will not hold torque.
* Low and reverse clutch assembly friction plate support face cracked/damaged.
DTC P2723 Automatic Transmission Case
Transmission case 1-2-3-4 clutch fluid passage seal damaged/leaking.
DTC P2723 Automatic Transmission Fluid Pump
* Fluid pump housing vanes/rotor/slide damaged/scored.
* Fluid pump outlet seal assembly damaged/leaking.
DTC P2723 Torque Converter Assembly
Fluid pump or torque converter overstressed due to high temperatures.
DTC P2723 Automatic Transmission Fluid Filter Assembly
Oil filter or filter seal loose or damaged.
DTC P2723 Reaction Sun Gear Assembly
* Reaction sun gear broke away from shell.
* Input sun gear missing or broken.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repairs.
* Perform the Reset Transmission Adapts Reset Procedure following all transmission repairs.
* Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair
* Control Valve Lower Body and Upper Body Replacement Control Valve Lower Body and Upper Body Replacement
* Low and Reverse Clutch and 1-2-3-4 Clutch Plate Removal Low and Reverse Clutch and 1-2-3-4 Clutch Plate Removal
* Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.