Chevrolet Trax: 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

NOTE: The DTCs listed below set due to a transmission hydraulic/mechanical condition. Perform the Circuit/System Verification and Circuit/System Testing to identify the cause.

DTC P2723

Pressure Control Solenoid Valve 5 Stuck Off - Transmission Hydraulic/Mechanical Performance

DTC P2724

Pressure Control Solenoid Valve 5 Stuck On - Transmission Hydraulic/Mechanical Performance

Circuit/System Description

Pressure control solenoid valve 5 is part of the control solenoid valve assembly, which has no serviceable components. The pressure control solenoid valve 5 regulates transmission fluid pressure 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 speed signals from the input shaft speed sensor and the output shaft speed 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, 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 9-32 V.
• Throttle position signal is valid.
• Engine speed is 400-7,500 RPM for 5 s.
• High side driver is enabled.
• Transmission fluid temperature is -6.6ºC (20ºF) or greater.
• Transmission output speed is 100 RPM or greater or the throttle position is 0.5% or greater.

  DTC runs continuously when above conditions are met.

Conditions for Setting the DTC

P2723

TCM detects an incorrect on-coming clutch gear ratio, or shift flare when the 1-2-3-4 clutch is commanded ON.

This condition must occur 3 times.

P2724

TCM detects an incorrect off-going clutch gear ratio, or shift tie-up when the 1-2-3-4 clutch is commanded OFF. This condition must occur 3 times.

Action Taken When the DTC Sets

• P2723 and P2724 are Type A DTCs.
• TCM freezes transmission adaptive functions.
• TCM commands maximum line pressure.
• TCM inhibits Tap Up/Tap Down.
• TCM inhibits Manual Up/Manual Down with the gear selector.
• Torque management is enabled.
• TCM inhibits powertrain braking.
• TCM inhibits neutral idle.
• TCM inhibits auto grade braking.
• TCM limits the transmission to reverse and 5th range - P2723 only.
• TCM limits the transmission to reverse and 3rd range - P2724 only.

Conditions for Clearing the DIC/DTC

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 (Encore, MH8 or MHB) , Automatic Transmission Controls Schematics (Trax, MH8 or MHB)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

• Inline Harness Connector End Views (Encore) , Inline Harness Connector End Views (Trax)

Description and Operation

• Drive Range, First Gear (Gen 2/Hybrid)
• Drive Range, Second Gear (Gen 2/Hybrid)
• Drive Range, Third Gear (Gen 2/Hybrid)
• Drive Range - Fourth Gear (Gen 2/Hybrid)
• Electronic Component Description
• Transmission Component and System Description
• Transmission General Description

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

WARNING: Refer to 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.

• 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.

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 DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

7. All OK.

Circuit/System Testing

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

1. Engine idling at the normal operating temperature.
2. Verify the transmission line pressures are within the specified range. Refer to Line Pressure Check, and Solenoid Valve Pressure (Gen 2) .

If the pressures are not within range

Refer to 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 solenoid valves when performing the solenoid valve test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.

If the pressure does not change

Replace the Q8 Control Solenoid Valve Assembly.

If the pressure changes

5. Verify the mechanical conditions listed below do not exist. Repair or replace as necessary.

P2723 or P2724 - Control Valve Body Assembly

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

P2723 - Automatic Transmission Fluid Filter Assembly

Oil filter or filter seal loose or damaged

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 - Trans 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 - Output Sun Gear Assembly

Housing/hub weld cracked/leaking.

P2723 - Lo and Reverse and 1-2-3-4 Clutch Housing Assembly

1-2-3-4 clutch piston cracked/damaged/leaking.

P2723 - Channel Plate and Spacer Plate

Oil channels or orifices blocked by debris.

P2723 or P2724 - Q8 Control Solenoid Valve Assembly

• Q27E Pressure Control Solenoid Valve 5 Stuck ON/OFF.
• O-ring seals leaking.
• Valve body filter plate assembly cracked, blocked, or damage gasket seal.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Perform the Transmission Adaptive Values Learn following all transmission repairs
• Control Module References - for Control Solenoid Valve Assembly replacement, programming and setup

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