For 1990-2009 cars

### 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: Clutch Pressure Control (PC) Solenoid 4 - Stuck Off
DTC P2715: Clutch Pressure Control (PC) Solenoid 4 - Stuck On

### Diagnostic Fault Information

The following fault table gives examples of how hydraulic circuit problems and malfunctioning hard parts affect the transmission operation.

Component | Cause | DTCs
--- | --- | ---
1-2-3-4 Clutch Piston Housing | 1-2-3-4 clutch piston seal cut or damaged | P2714
1-2-3-4 and 3-5-R Clutch Housing Assembly | 1-2-3-4 clutch backing plate retaining ring not seated, causing the piston to over-travel and cut 1-2-3-4 clutch piston seal | P2714
2-6 Clutch Piston Assembly | 2-6 clutch piston seal failure or damaged | P2714
3-5 Reverse Clutch Piston | 3-5 reverse clutch piston inner/outer seal cut or damaged | P2715
4-5-6 Clutch Piston Assembly | 4-5-6 clutch piston seal failure or damaged | P2715
Automatic Transmission Fluid Filter Assembly | Oil filter loose or damaged | P2714
Automatic Transmission Fluid Pump Cover Assembly |

• | Fluid pump cover vanes and fluid pump rotor broken

• | 1-2-3-4 and 3-5 reverse clutch fluid seal ring, on pump cover stator shaft, cut or damaged

P2714

Center Support Assembly |

• | Center support fluid passage seal assembly, incorrectly installed, cut or damaged

• | Lube hole blocked, incorrectly drilled or omitted

P2714

Control Solenoid (w/body and TCM) Valve Assembly | Clutch Pressure Control Solenoid 4:

• | Always exhausting - Stuck On

• | Not exhausting - Stuck Off

• | Needle piston or armature pin binding

• | Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal

• | O-ring seals leaking

P2714

P2715

• | HSD failure

• | TCM failure

P2714

Output Carrier Internal Front Gear | Installed upside down | P2714
Upper Control Valve Body | 2-6 regulator valve stuck - debris, sediment, binding or scored bore | P2715

#### Shift Solenoid Valve State and Gear Ratio

Gear | Shift SOL 1 | 1-2-3-4 CL PC SOL 5 N.L. | 2-6 CL PC SOL 4 N.L. | 3-5 REV CL PC SOL 2 N.H. | LOW REV 4-5-6 CL PC SOL 3 N.H. | Gear Ratio
--- | --- | --- | --- | --- | --- | ---
Park | ON | OFF | OFF | OFF | ON | --
Reverse | ON | OFF | OFF | ON | ON | 2.940
Neutral | ON | OFF | OFF | OFF | ON | --
1st Braking | ON | ON | OFF | OFF | ON | 4.584
1st | OFF | ON | OFF | OFF | OFF | 4.584
2nd | OFF | ON | ON | OFF | OFF | 2.964
3rd | OFF | ON | OFF | ON | OFF | 1.912
4th | OFF | ON | OFF | OFF | ON | 1.446
5th | OFF | OFF | OFF | ON | ON | 1.000
6th | OFF | OFF | ON | OFF | ON | 0.746
Effective Final Drive Ratio - 6T40/45 - 3.17/3.87 For shift solenoid 1, "ON" = Solenoid Energized (Pressurized) "OFF" = Solenoid De-energized (No Pressure) For pressure control solenoids, "ON" = Pressurized, "OFF" = No Pressure

### Circuit/System Description

The clutch pressure control (PC) solenoid 4 is part of the control solenoid (w/body and TCM) valve assembly. The control solenoid (w/body and TCM) valve assembly has no serviceable parts. The PC solenoid 4 is a normally high-pressure control solenoid which provides fluid pressure to the B-2-6 clutch regulator valve which regulates the transmission fluid pressure to the B-2-6 clutch. The TCM controls the solenoid pressure by regulating the exhaust fluid. When the TCM commands the solenoid OFF, the exhausting fluid is stopped and the B-2-6 pressure is high. When commanded ON, the clutch PC solenoid 4 regulates the amount of exhausting transmission fluid. Solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuits and components that the TCM powers. Should the circuit overload the driver will shutdown. After the overload is removed the HSD reset. The TCM calculates gear ratio based on data from the automatic transmission input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the known transmission gear ratio to a calculated gear ratio for each commanded gear.

### Conditions for Running the DTC

#### P2714

• | No ISS DTCs P0716 or P0717.

• | No OSS DTCs P0722 or P0723.

• | No IMS DTCs P1825 or P1915.

• | The ignition voltage is between 9.0 volts and 19.0 volts.

• | The transmission fluid temperature is 0°C (32°F) or greater.

• | The transmission input shaft speed is 80 RPM or greater.

• | The 2-6 clutch is commanded ON.

#### P2715

• | No ISS DTCs P0716 or P0717.

• | No OSS DTCs P0722 or P0723.

• | No IMS DTCs P1825 or P1915.

• | The ignition voltage is between 9.0 volts and 19.0 volts.

• | The transmission output shaft speed is 200 RPM or greater.

• | The 2-6 clutch is commanded OFF.

### Conditions for Setting the DTC

#### P2714

The TCM detects an incorrect on-coming clutch gear ratio, or flare, when the 2-6 clutch is commanded ON for 4.0 seconds and the transmission input shaft speed is 33 RPM or greater from the anticipated input shaft speed.

#### P2715

The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the 2-6 clutch is commanded OFF for 1.2 seconds and the transmission input shaft speed is 40 RPM or less from the anticipated input shaft speed.

### Action Taken When the DTC Sets

• | DTCs P2714 and P2715 are Type A DTCs.

• | The TCM commands maximum line pressure.

• | The TCM inhibits TCC.

• | The TCM freezes transmission adaptive functions.

• | The TCM inhibits TUTD.

### Conditions for Clearing the DIC/DTC

DTCs P2714 and P2715 are Type A DTCs.

### Diagnostic Aids

#### P2714

DTC P2714 detects a neutral gear when the 2-6 clutch in enabled for 2nd and 6th gear.

#### P2715

DTC P2715 detects a clutch tie-up when the 2-6 clutch in on-coming.

• | When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions.

• | Use the scan tool to view the PC sol. 4 status and refer to the Transmission Fluid Pressure Switch Logic table to determine when a PC solenoid 4 switch should be active or inactive for a given gear. This will help to determine if the hydraulic circuit functioning and if the PC solenoid or the valve train is in an incorrect position.

### Reference Information

#### Schematic Reference

• | Drive Range, Second Gear

• | Drive Range, Sixth Gear

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

• | Transmission General Description

• | Transmission Component and System Description

• | Electronic Component 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

#### Scan Tool Reference

Control Module References for scan tool information

#### Special Tools

• | DT-48616 Control Solenoid Test Plate

• | DT-48616-10 Adapter Harness

### Circuit/System Verification

1. Perform the Transmission Fluid Check .
2. Operate the vehicle in drive with the calculated throttle position greater than 15 percent to obtain 72 km/h (45 mph) and achieve 5th gear. Perform this maneuver 2 times.

⇒ | If the DTC resets, go to Circuit/System Testing.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Perform the Line Pressure Check .

⇒ | If the pressure is out of specification, correct this concern first.

2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning and retest the DTC as outlined in the Circuit/System Verification steps.

⇒ | If the DTC resets, continue on with testing.

3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .

⇒ | If a concern is found, repair or replace the control solenoid (w/body and TCM) valve assembly.

4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .

⇒ | If the solenoid is found to be leaking or stuck closed, replace the control solenoid (w/body and TCM) valve assembly.

5. Inspect the control valve lower body assembly for sticking valves, damage, scored bores, or debris.

⇒ | If a concern if found in the valve body, repair or replace the valve body as necessary.

6. Inspect the 2-6 clutch assembly for damage.

⇒ | If a concern is found in the 2-6 clutch assembly, repair or replace as necessary.

### Component Testing

Operating the transmission under the following conditions will verify that the PC solenoid or a portion of the hydraulic control circuit is not functioning as it should.

#### PC Sol 4 Operation

Transmission Operating Conditions | Transmission Condition if PC Sol. 4 is Stuck OFF | DTC
--- | --- | ---
Steady State: Gears 2nd or 6th | Neutral | P2714
Garage Shift: Park/Neutral to Reverse/Drive | Drive Gear | P2714
Downshift: from gears 3rd, 4th, or 5th to 2nd | Neutral | P2714
Steady State: Gears 1st, 3rd, 4th, 5th | 2nd or 6th | P2715
Garage Shift: Park/Neutral to Reverse/Drive | Drive Gear | P2715
Downshift: from gears 3rd, 4th, or 5th to 2nd | 2nd or 6th | P2715
Upshift: from gears 2nd to 3rd, 4th, or 5th | 2nd or 6th | P2715

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

• | Refer to Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.

• | Perform the Service Fast Learn Adapts 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

- | 2-6 Clutch Piston Installation

- | 3-5-Reverse and 4-5-6 Clutch Housing, and Input, Reaction, and Output Carrier Installation