6T30/6T40/6T45/6T50 (MH8, MH9) - Automatic Transmission (Gen 1)
DTC P2714 or P2715 (Gen 1)
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 P2714
- Pressure Control Solenoid Valve 4 Stuck Off
DTC P2715
- Pressure Control Solenoid Valve 4 Stuck On
Circuit/System Description
The clutch pressure control solenoid 4 is part of the control solenoid valve assembly which has no serviceable components. The pressure control solenoid 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 (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
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 between 9-32 V.
* Transmission fluid temperature is -7°C (19°F) or greater.
* Engine speed is between 400-7500 RPM for 5 seconds.
* 2-6 clutch is commanded ON.
* Output speed is 650 RPM or greater, 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.
* Ignition voltage is between 9-32 V.
* Transmission output shaft speed is 200 RPM or greater.
* Engine speed is between 400-7500 RPM for 5 seconds.
* 2-6 clutch is commanded OFF.
* Transmission fluid temperature is 0°C (32°F) or greater.
* Attained range is not 1st gear.
* High side driver is enabled.
* Transmission input speed is 200 RPM or greater.
Conditions for Setting the DTC
P2714
TCM detects an incorrect on-coming clutch gear ratio, or shift flare.
P2715
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.
* 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.
P2715
* DTC 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 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 setup 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
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Fuel Pump and Level Sensor Assembly
* Inline Harness Connector End Views X100
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
* Drive Range, Second Gear (Gen 1) Drive Range, Second Gear (Gen 1)Drive Range, Second Gear (Gen 2) Drive Range, Second Gear (Gen 2)
* Drive Range, Sixth Gear (Gen 1) Drive Range, Sixth Gear (Gen 1)Drive Range, Sixth Gear (Gen 2) Drive Range, Sixth Gear (Gen 2)
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 Transmission Fluid Level and Condition Check.
3. Verify the scan tool TFP Switch 3 parameter displays the correct state for each gear range while placing the gear select lever in Park, Reverse, and Neutral range. Refer to Transmission Fluid Pressure Switch Logic Transmission Fluid Pressure Switch Logic.
• If the correct state for each gear range is not displayed
Refer to Circuit/System Testing.
• If the correct state for each gear range is displayed
4. Gear select lever in Drive range.
Note: Use Drive 1st - Engine Braking to determine expected 1st gear Transmission Fluid Pressure Switch parameter states.
5. Verify the scan tool TFP Switch 3 parameter displays the correct state for each gear range while commanding the scan tool Shift Transmission Gear through all forward ranges. Refer to Transmission Fluid Pressure Switch Logic Transmission Fluid Pressure Switch Logic.
• If the correct state for each gear range is not displayed
Refer to Circuit/System Testing.
• If the correct state for each gear range is displayed
6. Ignition ON, engine OFF. Clear the TCM DTC information with a scan tool.
7. Perform the Road Test Road Test.
8. Verify DTC P2714 or P2715 did not set.
• If a DTC set
Refer to Circuit/System Testing.
• If a DTC does not set
9. 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.
10. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
11. All OK.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Verify the transmission line pressures are within range. Refer to Line Pressure Check Line Pressure Check and Solenoid Valve Pressure (Gen 1) Solenoid Valve Pressure (Gen 1).
• If the line pressures are not within the specified ranges
Refer to Fluid Pressure High or Low Fluid Pressure High or Low.
• If the line pressures are within the specified ranges
2. Engine Idling, shift selector in the Drive position.
3. Verify the scan tool parameters listed below display the correct state for each gear range while commanding the scan tool Shift Transmission Gear through all forward ranges. Refer to Transmission Fluid Pressure Switch Logic Transmission Fluid Pressure Switch Logic for the correct gear range states.
* TFP Switch 1
* TFP Switch 3
* TFP Switch 4
* TFP Switch 5
• If the correct state for each gear range is not displayed
1. Ignition OFF.
2. Remove the Control Valve Body. Refer to Control Valve Body Replacement Control Valve Body Replacement.
3. Verify the Control Valve Body is not contaminated with any debris and there is no damage or sticking valves, refer to Control Valve Body Cleaning and Inspection (Gen 2) Control Valve Body Cleaning and Inspection (Gen 2).
• If there is contamination, damage, or sticking valves, repair or replace the control valve body as necessary.
• If there is no contamination, damage, or sticking valves, replace the Q8 Control Solenoid Valve Assembly.
• If the correct state for each gear range is displayed
4. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.
P2714 A/Trans 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 Trans 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 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 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 Verification Tests after completing the repair.
Perform the Transmission Adaptive Values Learn Transmission Adaptive Values Learn following all transmission related repairs.
* Internal Components Removal Internal Components Removal
* 2-6 Clutch Piston 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) Low and Reverse and 1-2-3-4 Clutch Housing, Low and Reverse Clutch Assembly, Output Sun Gear, and 2-6 Clutch Plate DisassembleLow and Reverse and 1-2-3-4 Clutch Housing, Low and Reverse Clutch Assembly, Output Sun Gear, and 2-6 Clutch Plate Disassemble (Gen 2) Low and Reverse and 1-2-3-4 Clutch Housing, Low and Reverse Clutch Assembly, Output Sun Gear, and 2-6 Clutch Plate Disassemble
* 2-6 Clutch Piston Installation (6T30) 2-6 Clutch Piston Installation (6T30)2-6 Clutch Piston Installation (6T40/45/50) 2-6 Clutch Piston Installation (6T40/45/50)
* 3-5-Reverse and 4-5-6 Clutch Housing, and Input, Reaction, and Output Carrier Installation 3-5-Reverse and 4-5-6 Clutch Housing, and Input, Reaction, and Output Carrier Installation
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming and setup.