P0756

DTC P0756

Steps 1-6:

Circuit Description
The 2-3 shift solenoid (SS) valve is a normally-open exhaust valve that, in conjunction with the 1-2 shift solenoid (SS) valve, allows four different shifting combinations. The 2-3 SS valve is attached to the lower control valve body, within the transmission
The PCM monitors the actual gear ratio, and compares the actual gear ratio with the commanded gear ratio. DTC P0756 sets under two conditions
^ A stuck ON 2-3 SS valve
^ A stuck ON 2-3 shift valve
If the PCM detects a 4-3-3-4 shift pattern, then DTC P0756 sets. DTC P0756 is a type A DTC.

Conditions for Running the DTC
^ No MAP DTCs P0101, P0102 or P0103.
^ No MAP DTCs P0106, P0107 or P0108.
^ No TP DTCs P0121, P0122, P0123.
^ No VSS DTCs P0502 or P0503.
^ No AT ISS DTCS P0716 or P0717.
^ No IMS DTCs P1820, P1822, P1823 or P1825.
^ No shift solenoid electrical DTCs P1842, P1843, P1845 or P18347.
^ The engine run time is greater than 5 seconds.
^ The IMS indicates D1, D2, D3 or D4.
^ The transmission fluid temperature is 20 - 133°C (68 - 271°F)
^ The TP angle is 10 percent or greater
^ The vehicle speed is 8 km/h (5 mph) or greater.
^ The engine torque is 89 - 395 Nm (59 - 291 ft. lbs.).

Conditions for Setting the DTC
The following conditions occur twice during the same trip:
^ The PCM commands 1st gear and the gear ratio is 0.65:1 - 0.71:1, 4th gear, for 1 second.
^ The PCM commands 2nd gear and the gear ratio is 0.95:1 - 1.05:1, 3rd gear, for 0.5 second.

Action Taken When the DTC Sets
^ The PCM illuminates the malfunction indicator lamp (MIL).
^ The PCM commands an immediate landing to 2nd gear.
^ The PCM commands maximum line pressure.
^ The PCM inhibits TCC engagement.
^ The PCM freezes transmission adaptive functions.
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
^ The PCM stores DTC P0756 in PCM history.

Conditions for Clearing the MIL/DTC
^ The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
^ A scan tool can clear the MIL/DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.

Diagnostic Aids
^ If you clear DTC P0756, and then cannot reset DTC P0756, the following conditions may exist:
- Fluid contamination
- Plugged fluid circuits
- Restricted fluid circuits

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step verifies a 4-3-3-4 shift pattern.
4. This step tests for a mechanical or hydraulic condition causing the 2-3 SS valve to be stuck ON, or the circuit to be applied.