DTC P0756 2-3 (B) Shift Solenoid Performance. Oldsmobile Bravada 1996

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 1996 🢒 Bravada 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E 🢒 DTC P0756 2-3 (B) Shift Solenoid Performance

DTC P0756 2-3 (B) Shift Solenoid Performance 2.2L

Table 1:	Shift Solenoid Valve State and Gear Ratio 4L60-E
Table 2:	DTC P0756 2-3 Shift Solenoid Valve (2-3 SS Valve) -- Performance

Automatic Transmission Components 2.2L
Automatic Transmission Controls Schematics 2.2L
OBD II Symbol Description Notice

Circuit Description

The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid flow acting on the 2-3 shift valves. The 2-3 SS Valve is a normally-open exhaust valve that is used with the 1-2 Shift Solenoid Valve (1-2 SS Valve) in order to allow four different shifting combinations.

When the PCM detects a 1-2-2-1 only or a 4-3-3-4 only shift pattern, depending on the state of the mechanical failure, then DTC P0756 sets. DTC P0756 is a type B DTC.

Conditions for Setting the DTC

•	No TP DTCs P0122 or P0123

•	No VSS Assy. DTC P0502

•	No TFT Sensor DTCs P0712 or P0713

•	No TCC Stuck ON DTC P0742

•	No 1-2 SS Valve DTC P0753

•	No 2-3 SS Valve DTC P0758

•	No TFP Val. Position Sw. DTC P1810

•	No TCC PWM Sol. Valve DTC P1860

•	No TCC Sol. Valve DTC P1864

•	No 3-2 SS Valve Assy. DTC P1886

•	The vehicle speed is greater than 32 km/h (20 mph).

•	The gear range is D4.

•	The engine vacuum is 20-99 kPa.

•	The engine speed is less than 5500 RPM.

•	The engine speed is greater than 450 RPM for 2 seconds.

•	The transmission fluid temperature is 20-130°C (68-266°F).

•	The TCC is OFF.

All of the above conditions are met and either of the following fail conditions occurs two consecutive times:

•	The solenoid is stuck ON and Conditions 2 and 3 occur two consecutive times.

•	The solenoid is stuck OFF and Conditions 1 and 3 occur two consecutive times.

Condition 1:

•	The TP angle is greater than 38%.

•	First gear is commanded for 3.1 seconds.

•	The speed ratio is 0.5-2.8 (speed ratio is engine speed divided by output speed).

•	The transmission output speed is 600-1500 RPM.

•	The TCC slip speed is -300 to -400 RPM for 1.5 seconds.

Condition 2:

•	The TP angle is 13-55%.

•	The TP angle is within +/- 3%.

•	Third gear is commanded for 2.5 seconds.

•	The 3rd gear speed ratio is greater than the last 2nd gear speed ratio minus 0.4.

•	The 3rd gear TCC slip speed is greater than or equal to the last 2nd gear TCC slip speed plus 600 RPM for 2.5 seconds.

•	Discontinue the test if the time since the shift was commanded is 7.5 seconds.

Condition 3:

•	The TP angle is greater than 15%.

•	Fourth gear is commanded for 1.25 seconds.

•	The speed ratio is 2.05-4.

•	The TCC slip speed is 2000-4100 RPM for 3 seconds.

Action Taken When the DTC Sets

•	The PCM commands maximum line pressure.

•	The PCM freezes shift adapts from being updated.

•	The PCM illuminates the Malfunction Indicator Lamp (MIL).

Conditions for Clearing the MIL/DTC

•	The PCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.

•	A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.

•	The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

Diagnostic Aids

•	Verify that the transmission meets the specifications in the 4L60-E shift speed chart.

•	Other internal transmission failures may cause more than one shift to occur.

Shift Solenoid Valve State and Gear Ratio 4L60-E

Gear	1-2 Shift Solenoid	2-3 Shift Solenoid	Gear Ratio
1	ON	ON	3.059:1
2	OFF	ON	1.625:1
3	OFF	OFF	1.000:1
4	ON	OFF	0.696:1

Test Description

The numbers below refer to the step numbers on the diagnostic chart.

This step verifies that the scan tool commanded all shifts, and all shift solenoids responded correctly, but all the shifts did not occur.

DTC P0756 2-3 Shift Solenoid Valve (2-3 SS Valve) -- Performance

Step

Action

Value(s)

Yes

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Install the scan tool (tech 1) ®.
With the engine OFF, turn the ignition switch to the RUN position.

Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data.

Record the DTC Freeze Frame and Failure Records.
While the engine is operating, raise the drive wheels.
With the transmission in D4 range, use the scan tool to command 1st, 2nd, 3rd, and 4th gears while accelerating the vehicle.

Did you detect a 1-2-2-1 or 4-3-3-4 only shift pattern? (Road testing the vehicle may be necessary.)

Go to Step 3

Go to Diagnostic Aids

Inspect the shift solenoid/hydraulic circuit for:

•	An internal malfunction

•	Damaged seals

•	Refer to the diagnosis charts.

Did you find and correct a problem?

Go to Step 4

In order to verify your repair, perform the following procedure:

Select DTC.
Select Clear Info.
Operate the vehicle under the following conditions (only if traffic and road conditions permit):

3.1.	Hold the throttle at 50% and accelerate to 64 km/h (40 mph).

3.2.	Stop the vehicle, engine idling.

3.3.	Hold the throttle at 25% and accelerate to 80 km/h (50 mph).

Select Specific DTC. Enter DTC P0756.

Has the test run and passed?

System OK

Begin the diagnosis again. Go to Step 1

DTC P0756 2-3 (B) Shift Solenoid Performance 4.3L

Table 1:	Shift Solenoid Valve State and Gear Ratio 4L60-E
Table 2:	DTC P0756 2-3 Shift Solenoid Valve (2-3 SS Valve) -- Performance

Automatic Transmission Components 4.3L
Automatic Transmission Controls Schematics 4.3L
OBD II Symbol Description Notice

Circuit Description

The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid flow acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve. With the 1-2 Shift Solenoid Valve (1-2 SS Valve), the 2-3 SS Valve allows four different shifting combinations.

When the VCM detects a 1-2-2-1 only or a 4-3-3-4 only shift pattern, depending on the state of the mechanical failure, then DTC P0756 sets. DTC P0756 is a type B DTC.