09 Pontiac G6 shifting problem

2009 Pontiac g6 gt (4 engines not told)

GM transmission, guess 4T65-E
check all fuses, so the TCM can work.
scan the PCM see tranny errors, DTC coded errors.
bad parts need to be replaced so buy them and do that
ask GM first. then used parts ,
at
car-part.com (wreckers)

no blind person can inspect your shift linkes
find a shop to do that. real hands on persons./
the service manual even cover this
called checking shift linkage for proper shift rod lever on the box for proper detent engagement.
so low fails and reverse fails
or only DRIVE fails. PRNDL
if you move NDL and see if you can feel the detent for drive this may work or for sure proves the point.
get the car serviced. tell them your woe.

pulling the battery will cause more problems than it solves
to reset the system use a scan tool

The code tells you that it is a sensor so that is what I would be looking at fixing first. Have a pressure test done on the box to remove any pressure problem indicators before you pull the box.

Have a trans shop road test & come up with something

Check Engine Light Codes and Meanings
Long blinks Short blinks Problem
1 1 Camshaft position sensor
1 2 Mass air flow sensor
1 3 Engine coolant temperature sensor
1 4 Speed sensor
1 11 EVAP control system (flow)
1 14 Fuel injection system right bank (too rich)
1 15 Fuel injection system right bank (too lean)
2 1 Ignition circuit
2 3 Closed throttle position switch
2 5 Idle speed control
2 9 Fuel Injection system left bank (too rich)
2 10 Fuel Injection system left bank (too lean)
3 1 ECU
3 2 Exhaust gas recirculation system flow problem
3 3 Front left O2 sensor
3 4 Knock sensor
3 5 Exhaust gas recirculation temperature sensor
3 6 EGRC-BPT valve
3 7 Closed loop control
3 8 Closed loop control
4 1 Air intake temperature sensor
4 2 Fuel tank temperature sensor
4 3 Throttle position sensor
4 7 Crankshaft position sensor
5 3 Front right O2 sensor
5 4 Automatic transmission control unit
6 3 Cylinder #6 misfire
6 4 Cylinder #5 misfire
6 5 Cylinder #4 misfire
6 6 Cylinder #3 misfire
6 7 Cylinder #2 misfire
6 8 Cylinder #1 misfire
7 1 Multiple cylinder misfire
7 2 Three way catalytic converter (right side)
7 3 Three way catalytic converter (left side)
7 4 Evaporative emission control system pressure sensor
7 5 Evaporative emission control system
7 7 Rear O2 sensor
8 1 Vacuum cut valve bypass valve
8 2 Crank position sensor
8 3 Absolute pressure sensor
8 4 Automatic transmission control unit
8 6 Evaporative emission canister purge control solenoid valve
8 7 Evaporative emission Canister purge control solenoid valve circuit
9 1 Front Right O2 sensor
9 3 Evaporative emission Canister vent control valve
9 5 Crankshaft position sensor
9 8 Engine coolant temperature sensor
10 1 Front left O2 sensor
10 3 Park and Neutral position switch
10 5 EGRC solenoid valve
10 8 Evaporative emission canister purge volume control valve
11 1 Inhibitor switch
11 2 Revolution sensor
11 3 Improper shifting to first gear (Automatic transmission)
11 4 Improper shifting to second gear (Automatic transmission)
11 5 Improper shifting to third gear (Automatic transmission)
11 6 Improper shifting to fourth gear (Automatic transmission)
11 7 Solenoid valve lock up function
12 1 Shift solenoid B (Automatic transmission)
12 3 Overrun clutch solenoid valve (Automatic transmission)
12 4 Torque converter clutch solenoid valve (Automatic transmission)
12 5 Line pressure solenoid valve (Automatic transmission)
12 6 Throttle position sensor (Automatic transmission)
12 7 Engine speed signal
12 8 Fluid temperature sensor
13 2 MAP/BARO Switch Solenoid Valve
13 5 Fuel pump control module
13 8 Cooling fan

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure
you will get the solution of your problem.
Best Manuals

You dont say what engine you have so I ASSUME its the 4 cylinder??? I dont know what your car needs because I dont know what has been checked, but even the wrong viscosity engine oil or low oil level can cause this code. Or it could be a cam sensor problem. I would have a professional repair shop check it out and recommend repairs.

the sylinoid in the trany could be going bad

I have the exact car w/same exact problem. I was told that ist was the speed sensor, which just so happens to be located inside the transmission w/a $400. repair bill.