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

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

DTC P2714: Pressure Control Solenoid Valve 4 Stuck Off

DTC P2715: Pressure Control Solenoid Valve 4 Stuck On

Circuit/System Description

The clutch pressure control (PC) solenoid 4 is part of the control solenoid valve assembly which has no serviceable components. The PC solenoid 4 regulates transmission fluid pressure (TFP) 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 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

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.
    • The high side driver (HSD) is enabled.
    • The throttle position signal is valid.
    • The ignition voltage is 9.0 volts or greater.
    • The transmission fluid temperature (TFT) is -7°C (19°F) or greater.
    • The engine speed is greater than 400 RPM for 5 seconds.
    • The 2-6 clutch is commanded ON.
    • The output speed is greater than 650 RPM or the throttle position is greater than 0.5 percent.

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.
    • The ignition voltage is 9.0 volts or greater.
    • The transmission output shaft speed is 200 RPM or greater.
    • The 2-6 clutch is commanded OFF.
    • The TFT is 0°C (32°F) or greater.
    • The attained range is not 1st gear.
    • The HSD is enabled.
    • The transmission input speed is 200 RPM or greater.

Conditions for Setting the DTC

P2714

The TCM detects an incorrect on-coming clutch gear ratio, or shift flare.

P2715

The TCM detects an incorrect off-going clutch gear ratio, or shift tie-up.

Action Taken When the DTC Sets

P2714

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

P2715

    • DTC P2715 is a Type A DTC.
    • The TCM commands maximum line pressure.
    • The TCM freezes transmission adaptive functions.
    • The TCM inhibits the Tap Up/Tap Down function.
    • The TCM inhibits manual shifting of forward gears.
    • The TCM limits the transmission to reverse and 2nd gear.

Conditions for Clearing the DIC/DTC

DTCs P2714 and P2715 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

Schematic Reference

    •  Drive Range, Second Gear : Gen 1
    •  Drive Range, Sixth Gear : Gen 1

Description and Operation

    •  Transmission General Description
    •  Transmission Component and System Description
    •  Electronic Component Description

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. Monitor the Transmission Fluid Pressure Switch 3 with a scan tool. Place the gear select lever in Park, Reverse, and Neutral range. Verify the Transmission Fluid Pressure Switch 3 parameter states are correct for Park, Reverse, and Neutral. Refer to Transmission Fluid Pressure Switch Logic .
  4. 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 3 parameter states are correct for all forward ranges. Refer to Transmission Fluid Pressure Switch Logic .
  5. Engine ticking over in Park, verify with a scan tool the ISS/OSS Supply Voltage parameter displays OK.
  6. 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.
  7. 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.

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

  8. Perform the Road Test . Verify the transmission operation performs as indicated in the road test instructions.
  9. Review the scan tool snapshot data. Verify the following transmission data parameters display the correct values for each gear range.
    10. • Transmission ISS
    • Transmission OSS
    • Pressure Control Solenoid Valve 4
    • Transmission Fluid Pressure Switch 3
  10. 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/replace as necessary.

DTCs

Component

Condition

P2714

P2715

Control Valve Body Assembly

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

P2714

P2715

Q8 Control Solenoid Valve Assembly
    • Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal
    • O-ring seals leaking

P2714

P2715

Transfer 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

Transfer 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 transfer case groove

P2714

Torque Converter (w/fluid pump) Housing Assembly

Fluid pump housing/gear damaged/scored

P2714

A/Trans 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
       -  2-6 Clutch Piston Removal
       -  Low and Reverse and 1-2-3-4 Clutch Housing, Low and Reverse Clutch Assembly, Output Sun Gear, and 2-6 Clutch Plate Disassemble : Gen 1
       -  2-6 Clutch Piston Installation : 6T40/45/50
       -  3-5-Reverse and 4-5-6 Clutch Housing, and Input, Reaction, and Output Carrier Installation
   


© Copyright Chevrolet. All rights reserved
   


© Copyright Chevrolet. All rights reserved