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Transmission problem

Have an 05 Dually with an automatic trans. has dtc codes: P0740, P2701, and P0756. Want stay in overdrive and tow/haul light flashes, have pulled and cleaned valve body, what do i do next?
 

blacksnapon

Moderator
Staff member
all codes send you to ppt a

Test Step Result / Action to Take
A1 ELECTRONIC DIAGNOSTICS
Ignition OFF.
Select PARK.
Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
Connect the diagnostic tool.
Ignition ON.
Enter the following diagnostic mode on the diagnostic tool: TCM Module.
Enter the following diagnostic mode on the diagnostic tool: Active Command Modes.
Select TCM Module, then select Active Command Diagnostic Mode.
Monitor the appropriate PID for the solenoid SSPC-x or TCC being tested, refer to the PID chart in Output State Control (OSC) Mode.
Can the PIDs be monitored or solenoids be commanded?
Yes
REMAIN in Active Command Diagnostic Mode. GO to A2 .

No
REPEAT procedure to enter Active Command Diagnostic Mode. If the vehicle did not enter Active Command Diagnostic Mode, REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for diagnosis of the powertrain control module (PCM).
A2 SOLENOID COMMAND TEST
Monitor the appropriate commanded current PID(s) for the solenoid being tested.
Select the appropriate solenoid that is to be tested, SSx_AMP or TCC_AMP.
Select value: 0, 0.25, 0.50, 0.75 or 1.0 amp.
Press "SEND".
Select another value: 0 - 1.0 amp.
Press "SEND".
Cancel and return to normal operation.
Do the monitored current readings change and match the command?
Yes
CLEAR DTCs. Road test. If symptom persists, GO to Diagnosis By Symptom.

No
GO to A3.
A3 CHECK FOR BATTERY VOLTAGE
Disconnect the transmission vehicle harness connector from the transmission bulkhead connector.
Inspect the harness connector for damaged pins.
Ignition ON.
Measure the voltage between the appropriate power pins on the harness side.
Is the voltage greater than 10 volts?
Yes
GO to A4.

No
REPAIR the circuit. TEST for normal operation.
A4 ELECTRICAL SIGNAL CHECK
Disconnect the vehicle wire harness connector from the PCM.
Carry out a continuity check between the appropriate transmission connector signal pin and the PCM connector signal pin on the vehicle harness side.
Check the appropriate signal wire for shorts to ground.
Are there shorts or opens in the vehicle wire harness signal lead?
Yes
REPAIR an open or short in the harness.

No
GO to A5.
A5 CHECK THE INTERNAL HARNESS
Drain the transmission fluid.
Remove the transmission fluid pan.
Disconnect: Affected Solenoid.
Measure the resistance between pins 1, 3, 4, 5, 8, 10 and 12 transmission bulkhead side and pin 2 at each associated solenoid connector.
Measure the resistance between pins 7, 20 and 24 transmission bulkhead side and pin 1 at each associated solenoid connector.
Are the resistances less than 0.5 ohms?
Yes
GO to A6.

No
INSTALL a new harness. GO to A7.
A6 CHECK FOR A SHORT TO GROUND
Measure the resistance between pins 1, 3, 4, 5, 8, 10 and 12 harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to A7.

No
INSTALL a new harness.
A7 CHECK THE SOLENOID RESISTANCE AT THE SOLENOID
Measure the resistance between pins 1 and 2 at each solenoid.
Is the resistance between 4.1-4.7 ohms?
Yes
GO to A8.

No
INSTALL a new solenoid if not within specification. CLEAR the DTCs. TEST the system for normal operation.
A8 CHECK THE SOLENOID FOR A SHORT TO GROUND
Measure the resistance between pins 1 and 2 at each solenoid and ground.
Is the resistance greater than 10,000 ohms?
Yes
INSTALL a new PCM. If the condition persists, REFER to Diagnosis By Symptom in this section for diagnosis of pressure concerns. CLEAR the DTCs. TEST the system for normal operation.

No
INSTALL a new solenoid.
 

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