DTC P0756 2-3 (B) Shift Solenoid Performance. Chevrolet Camaro 1997

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1997 🢒 Camaro 🢒 DTC 🢒 DTC P0756 2-3 (B) Shift Solenoid Performance

DTC P0756 2-3 (B) Shift Solenoid Performance 3.8L, VIN K

OBD II Symbol Description Notice
Automatic Transmission Components VIN K

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. The combination of the 2-3 SS Valve and the 1-2 Shift Solenoid Valve allows four different shift combinations.

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

Conditions for Setting the DTC

•	No TP DTCs P0122 or P0123

•	No VSS DTCs P0502 or P0503

•	No TCC Sol. Valve DTC P0740

•	No TCC Stuck ON DTC P0742

•	No 1-2 SS Valve DTC P0753

•	No 2-3 SS Valve DTC P0758

•	No 3-2 SS Valve Assy. DTC P0785

•	No TFP Valve Position Switch DTC P1810

•	No TCC PWM Sol. Valve DTC P1860

•	The vehicle speed is greater than 6 km/h (4 mph).

•	The gear range is D4.

•	The engine speed is greater than 400 RPM for 5 seconds and not in fuel cutoff.

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

•	The engine vacuum is 0-105 kPa.

•	The engine torque is 6-542 N·m (5-400 lb ft).

All the above conditions are met and one of the following combinations occurs:

•	Cases 1 and 3 occur three consecutive times.

•	Cases 2 and 3 occur three consecutive times.

•	Cases 3 and 4 occur three consecutive times.

•	Any combination of (Cases 1 and 3) and (Cases 2 and 3) occur three consecutive times.

Case 1

•	First gear is commanded for 2 seconds, or more.

•	The TP angle is 15% or more.

•	The TCC slip is -3000 to 0 RPM.

•	The speed ratio is 0.65-3.0 (Speed ration is engine speed divided by Output Speed).

•	The output speed is 400-1500 RPM.

•	All conditions are met for greater than 1.5 seconds.

Case 2

•	Second gear is commanded for 409.5 seconds or more.

•	The TCC slip is 0 RPM.

•	The TP angle is greater than 99.9%.

•	The output speed is 8191.75 RPM.

•	The speed ratio is 0 (speed ratio is engine speed ÷ output speed).

•	All conditions are met for greater than 409.5 seconds.

Case 3

•	Third gear is commanded for 2.5-4.4 seconds.

•	The TP angle is 13-50%.

•	The TP angle is constant within +/- 5%.

•	The speed ratio does not decrease more than 0.35 from the last slip in second gear.

•	The TCC slip in third gear is greater than the last slip in second gear plus 600 RPM.

•	All conditions are met for greater than 1 second.

Case 4

•	Fourth gear is commanded for greater than 1 second.

•	The TCC slip speed is 1000-4000 RPM.

•	The output speed is 1400-2500 RPM.

•	The TP angle is greater than 10%.

•	The speed ratio is 1.68-3.3 (speed ration is the engine speed ÷ output speed).

•	All conditions are met for greater than 1 second.

Action Taken When the DTC Sets

•	The PCM freezes shift adapts from being updated.

•	The PCM defaults the transmission to 3rd gear.

•	The PCM commands maximum line pressure.

•	The PCM inhibits TCC engagement.

•	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 Shift Speed table.

•	Refer to Shift Solenoid Valve State and Gear Ratio .

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

Test Description

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

This step verifies that the TFP Valve Position Switch is functioning normally.

This step tests for a selected gear ratio vs a ratio not obtainable under normal driving conditions.

DTC P0756 2-3 Shift Solenoid 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 , Section 6.

Install the Scan Tool ®.
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, apply the brake pedal and select each transmission range Low, Dr 2, Dr 3, Overdrive, Reverse, and Park.

Does each selected transmission range match the TR Switch on the scan tool?

Go to Step 3

Go to Pressure Switch Assembly Resistance Check

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

Was 1st gear commanded and not achieved, or 4th gear commanded and other than 4th gear occurred? (Road testing the vehicle may be necessary).

Go to Step 4

Go to Diagnostic Aids

Inspect the shift circuit for the following problems:

•	An internal malfunction in the shift solenoids.

•	Damaged seals on the shift solenoids.

Refer to the diagnosis tables.

Did you find and correct a problem?

Go to Step 5

After the repair is complete, select DTC.
Select Clear Info.
Operate the vehicle under the following conditions (only if driving conditions allow you):

•	Hold the throttle at above 45% and accelerate to 88 km/h (55 mph). If the throttle moves more than 3%, stop the vehicle and start again.

•	Hold the throttle at above 18% and accelerate to 88 km/h (55 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 5.7L, VIN P

Automatic Transmission Components VIN P
OBD II Symbol Description Notice