6T70/6T75 - 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
- Pressure Control Solenoid Valve 5 Stuck Off
DTC P2724
- Pressure Control Solenoid Valve 5 Stuck On
Circuit/System Description
The clutch pressure control solenoid 5 is part of the control solenoid valve assembly which has no serviceable components. The clutch 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
P2723
* DTC 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, P0716, P0717, P0722, P0723, or P182E is not set.
* Ignition voltage is between 8.6-32.0 V.
* High side driver is enabled.
* Output speed is 36 RPM or greater, or the throttle position is 0.5 percent or greater.
* Throttle position signal is valid.
* Engine speed is between 400-7500 RPM for 5 seconds.
* Transmission fluid temperature is -7°C (19°F) or greater.
P2724
* DTC 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, P0716, P0717, P0722, P0723, or P182E is not set.
* Ignition voltage is between 8.6-32.0 V.
* High side driver is enabled.
* Transmission Fluid Temperature is -7°C (19°F) or greater.
* Output speed is 36 RPM or greater, or the throttle position is 0.5 percent or greater.
* Engine speed is between 400-7500 RPM for 5 seconds.
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 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 will allow you to display, monitor, and verify multiple transmission data parameters at one time, after the road test.
Reference Information
Connector End View Reference
* Component Connector End Views Sunshade - Left Front
* Inline Harness Connector End Views X110
Description and Operation
* Transmission General Description Transmission General Description
* Drive Range, First Gear Engine Braking First Gear Engine Braking
* Drive Range, Second Gear Second Gear
* Drive Range, Third Gear Third Gear
* Drive Range - Fourth Gear 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 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 6T70/6T75 - Automatic Transmission.
3. Ignition ON, engine OFF. Clear the TCM DTC information with a scan tool
4. Perform the Road Test 6T70/6T75 - Automatic Transmission.
5. Verify DTC P2723 or P2724 did not set.
• If a DTC sets
Refer to Circuit/System Testing.
• If a DTC does not set
6. 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.
7. Verify DTC P2723 or P2724 did not set.
• If a DTC sets
Refer to Circuit/System Testing.
• If a DTC did not set
8. All OK.
Circuit/System Testing
1. Verify the transmission line pressures are within the ranges specified in the Line PC Solenoid Valve Pressure table. Refer to Line Pressure Check Line Pressure Check and Solenoid Valve Pressure Solenoid Valve Pressure.
• If line pressures are not within the specified ranges
Refer to Fluid Pressure High or Low Fluid Pressure High or Low.
• If line pressures are within the specified ranges
2. Ignition OFF, remove the Q8 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. Test all solenoids on the Q8 Control Solenoid Valve Assembly.
4. Verify a pressure change occurs for each solenoid valve.
• If a pressure change does not occur for each solenoid
Replace the Q8 Control Solenoid Valve Assembly.
• If a pressure change occurs for each solenoid
5. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.
* Manual shift detent (w/shaft position switch) lever assembly not engaged with manual shaft.
* Clutch select valve 3 stuck OFF from debris, binding, damaged valve, or scored bore.
* 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.
* 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.
* Channel plate and spacer plate oil channels or orifices blocked by debris.
* 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.
* Low and reverse clutch assembly will not hold torque.
* Low and reverse clutch assembly friction plate support face cracked/damaged.
* Transmission case 1-2-3-4 clutch fluid passage seal damaged/leaking.
* Fluid pump housing vanes/rotor/slide damaged/scored.
* Fluid pump outlet seal assembly damaged/leaking.
* Fluid pump or torque converter overstressed due to high temperatures.
* Oil filter or filter seal loose or damaged.
* Reaction sun gear broke away from shell.
* Input sun gear missing or broken.
Repair Instructions
Note:
* Perform the Reset Transmission Adapts Reset Transmission Adapts following all transmission related repairs.
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* 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, setup, and programming