To the top of the document
Orlando
   
GMDE Start Page Load static TOC Load dynamic TOC Help?

DTC P2723 or P2724

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • 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 (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

    • 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.
    • The ignition voltage is 9.0 volts or greater.
    • The throttle position signal is valid.
    • The engine speed is 400 RPM or greater for 5 seconds.
    • The high side driver (HSD) is enabled.
    • The transmission fluid temperature (TFT) is -7°C (19°F) or greater.
    • The transmission output speed is 650 RPM or greater or the throttle position is 0.5 percent 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.
    • The TFT is 0°C (32°F) or greater.
    • The HSD is ON.
    • The transmission output shaft speed is 200 RPM or greater.
    • The transmission input shaft speed is 200 RPM or greater.
    • The commanded range is not 1st gear.

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 commands maximum line pressure.
    • The TCM inhibits Tap Up/Tap Down.
    • The TCM inhibits Manual Up/Manual Down with the gear selector.
    • Torque management is enabled.
    • The TCM limits the transmission to reverse and 5th range.

P2724

    • DTC P2724 is a Type A DTC.
    • The TCM freezes transmission adaptive functions.
    • The TCM commands maximum line pressure.
    • The TCM inhibits Tap Up/Tap Down.
    • The TCM inhibits Manual Up/Manual Down with the gear selector.
    • The TCM limits the transmission to reverse and 3rd range.

Conditions for Clearing the DIC/DTC

DTCs P2723 and P2724 are Type A DTCs.

Diagnostic Aids

Before performing a road test, configure and set-up 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 Component and System Description
    •  Electronic Component Description

For Hydraulic Schematic reference and description, refer to:

    •  Drive Range, First Gear
    •  Drive Range, Second Gear
    •  Drive Range, Third Gear
    •  Drive Range - Fourth Gear
    •  Drive Range, Fifth Gear
    •  Drive Range, Fifth Gear Default
    •  Drive Range, Sixth Gear

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

    Warning: Refer to Handbrake and Drive Wheels Warning in the Preface section.

    Note: If other DTCs are set, diagnose those DTCs first.

  1. Engine ticking over in Park, with handbrake applied and drive wheels chocked.
  2. Perform the Transmission Fluid Level and Condition Check , to verify correct fluid level and condition.
  3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning, to dislodge debris and free up the valves.
  4. Monitor the Transmission Fluid Pressure Switch 4 with a scan tool. Place the gear select lever in Park, Reverse, and Neutral range. Verify the Transmission Fluid Pressure Switch 4 parameter states are correct for Park, Reverse, and Neutral. Refer to Transmission Fluid Pressure Switch Logic .
  5. Place the gear select lever in Drive range. Command the shift transmission with a scan tool through all forward ranges. Verify the Transmission Fluid Pressure Switch 4 parameter states are correct for all forward ranges. Refer to Transmission Fluid Pressure Switch Logic .
  6. Engine ticking over in Park, verify with a scan tool the ISS/OSS Supply Voltage parameter displays OK.
  7. Engine ticking over 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.
  8. 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.

    9. Note: Perform a scan tool snapshot, during the road test.

  9. Perform the Road Test . Verify the transmission operation performs as indicated in the road test instructions.
  10. Review the scan tool snapshot data. Verify the following transmission data parameters display the correct values for each gear range.
    11. • Transmission ISS
    • Transmission OSS
    • Pressure Control Solenoid Valve 5
    • Transmission Fluid Pressure Switch 4
  11. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections .

Circuit/System Testing

    Note: You must perform the Circuit/System Verification first.

  1. Perform the 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 : Gen 1 .
    2. ⇒If not within the specified range, refer to Fluid Pressure High or Low .
  2. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
  3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
    4. ⇒If the Q8 control solenoid valve assembly does not pass the performance test, replace the Q8 control solenoid valve assembly.
  4. Inspect for the following conditions and repair or replace as necessary.

DTCs

Component

Condition

P2723

P2724

Control Valve Body Assembly

1-2-3-4 clutch regulator valve stuck/sticking - debris, binding, damaged valve, or scored bore

P2723

P2724

Q8 Control Solenoid Valve Assembly (314)
    • O-ring seals leaking
    • Valve body filter plate assembly cracked, blocked, or damaged gasket seal

P2723

Lo and Reverse and 1-2-3-4 Clutch Housing Assembly (51)

1-2-3-4 clutch piston (414) cracked/damaged/leaking

P2723

Output Sun Gear Assembly

Housing/hub weld cracked/leaking

P2723

Transfer case and 1-2-3-4 Clutch Backing Plate Retaining Ring

1-2-3-4 clutch backing plate retaining ring not seated/oriented, causing clutch pack/piston over travel

P2723

Torque Converter (w/Fluid Pump) Housing Assembly
    • Fluid pump housing/gear damaged/scored
    • Fluid pump or torque converter overstressed due to high temperatures

P2723

Automatic Transmission Fluid Filter Assembly

Oil filter or filter seal loose or damaged

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

    • Refer to Control Module References for control solenoid valve assembly replacement, set-up, and programming.
    • Perform the Transmission Adaptive Values Learn following all transmission related repairs.
    • Perform the:
       -  Internal Components Removal
       -  Low and Reverse and 1-2-3-4 Clutch Housing Disassemble
       -  Low and Reverse and 1-2-3-4 Clutch Housing Cleaning and Inspection
       -  Low and Reverse and 1-2-3-4 Clutch Housing Assemble
       -  Low and Reverse and 1-2-3-4 Clutch Housing, and 1-2-3-4 Clutch Plate Installation : 6T40/45
   


© Copyright Chevrolet. All rights reserved