Diagnostic Instructions

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

P2715

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

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.

Reference Information

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

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.