Chevrolet Trax: DTC P2714 OR P2715

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 P2714

Pressure Control Solenoid Valve 4 Stuck Off - Transmission Hydraulic/Mechanical Performance

DTC P2715

Pressure Control Solenoid Valve 4 Stuck On - Transmission Hydraulic/Mechanical Performance

Circuit/System Description

Pressure control solenoid valve 4 is part of the control solenoid valve assembly which has no serviceable components. Pressure control solenoid valve 4 regulates transmission fluid pressure to the 2-6 regulator valve which controls pressure to the 2-6 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

P2714

• 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.
• High side driver is enabled.
• Throttle position signal is valid.
• Ignition voltage is 9-32 V.
• Transmission fluid temperature is -6.6ºC (20ºF) or greater.
• Engine speed is 400-7,500 RPM for 5 s.
• Pressure control solenoid 4 is commanded ON, applying the 2-6 clutch.
• Output speed is 100 RPM or greater, or the throttle position is greater than 0.5%.
• Runs continuously when above conditions are met.

P2715

• 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.
• Transmission output shaft speed is 100 RPM or greater, or throttle position is 0.5% or greater.
• Pressure control solenoid 4 is commanded OFF, releasing the 2-6 clutch.
• Transmission fluid temperature is -6.6ºC (20ºF) or greater.
• Engine speed is 400-7,500 RPM for 5 s.
• Engine torque is 45 N.m (33 lb ft) or greater.
• The attained range is not 1st gear.
• High side driver is enabled.
• Runs continuously when above conditions are met.

Conditions for Setting the DTC

P2714

TCM detects an incorrect on-coming clutch gear ratio, or shift flare. This condition must occur 3 times.

P2715

TCM detects an incorrect off-going clutch gear ratio, or shift tie-up. This condition must occur 3 times.

Action Taken When the DTC Sets

P2714

• P2714 is a Type A DTC.
• TCM commands maximum line pressure.
• TCM freezes transmission adaptive functions.
• TCM inhibits the Tap Up/Tap Down function.
• TCM inhibits manual shifting of forward gears.
• TCM limits the transmission to reverse and 3rd gear.
• TCM inhibits powertrain braking.
• TCM inhibits neutral idle.
• TCM inhibits auto grade braking.

P2715

• P2715 is a Type A DTC.
• TCM commands maximum line pressure.
• TCM freezes transmission adaptive functions.
• TCM inhibits the Tap Up/Tap Down function.
• TCM inhibits manual shifting of forward gears.
• TCM inhibits powertrain braking.
• TCM inhibits auto grade braking.
• TCM inhibits neutral idle.
• TCM commands 2nd gear if the output speed is less than 700 RPM.
• TCM commands neutral if the output speed is 700 RPM or greater.

Conditions for Clearing the DTC

P2714 and P2715 are Type A DTCs.

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, Second Gear (Gen 2/Hybrid)
• Drive Range, Sixth 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. Ignition ON.
2. Verify DTC P0716, P0717, P0722, P0723, P077C, P077D, P07BF, or P07C0 was not set by reviewing the scan tool Freeze Frame/Failure Records data.

If any of the DTCs were set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

If none of the DTCs were set

3. Engine idling, transmission in Park, with parking brake applied and drive wheels chocked.
4. 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

5. Ignition ON, clear the TCM DTCs with a scan tool.
6. Verify DTC P2714 or P2715 does not set while performing a road test. Refer to Road Test.

If DTC P2714 or P2715 sets

Refer to Circuit/System Testing.

If DTC P2714 or P2715 does not set

7. 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.
8. Verify the DTC does not set.

If the DTC sets

Refer to Circuit/System Testing.

If the DTC does not set

9. 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 conditions listed below do not exist. Repair or replace as necessary.

P2714 Channel Plate and Spacer Plate

Oil channels or orifices blocked by debris.

P2714 or P2715 Control Valve Body Assembly

2-6 clutch regulator valve stuck/sticking, debris, binding, damaged valve, or scored bore.

P2714 Automatic Transmission Fluid Filter Assembly

Oil filter or filter seal loose or damaged

P2714 Torque Converter (w/fluid pump) Housing Assembly

Fluid pump housing/gear damaged/scored.

P2714 Trans case and 1-2-3-4 clutch backing plate retainer ring

1-2-3-4 clutch backing plate retaining ring not seated/oriented correctly at trans case groove.

P2714 or P2715 Transmission case, 2-6 clutch piston, spring retaining ring, reaction sun gear

• 2-6 clutch return spring retaining ring not seated in groove
• 2-6 clutch piston assembly - seal damaged or leaking
• 2-6 clutch plates worn or damaged
• 2-6 clutch plates will not slide over the reaction sun gear shell freely

P2714 or P2715 Q8 Control Solenoid Valve Assembly

• Pressure Control Solenoid Valve 4 Stuck ON/OFF.
• Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal.
• O-ring seals leaking.

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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