My transmission is not shifting why?

Check and replace solenoid pack on the side of the tranny Does your selector show what gear you are in P R N D when you move it let me know

I just remembered one I had not too long back. The wiring harness was chafed against the trans pan and cut through a wire. Take a close look at the wire harness and see if it touches metal anywhere then look real close at those wires.

Suspect tranny solenoids pack
need to have it scanned for codes

or cycle the ignition key on off on off on read P0000 codes in the odometer area

Do you have check engine light on
scan TCM for codes
most common is speed sensors and or tranny solenoid packs
should have it scanned for codes

Good afternoon,

I attached a list of issues below for this. From the looks of the code, it is an electrical issue, not a component issue.

Do you have a scan tool that can read the transmission and a voltmeter to do some checks?

Roy

P0720 - OUTPUT SPEED SENSOR ERROR

When Monitored and Set Condition:
P0720 - OUTPUT SPEED SENSOR ERROR

When Monitored: The transmission gear ratio is monitored continuously while the transmission is in gear.

Set Condition: If there is an excessive change in output RPM in any gear.

Possible Causes:

Intermittent wiring and connectors
Output speed sensor signal circuit open
Speed sensor ground circuit open
Output speed sensor signal circuit short to ground
Output speed sensor signal circuit short to voltage
Speed sensor ground circuit short to voltage
Output speed sensor error
TCM - output speed sensor

The very common is tranny solenoid mounted on the side of the tranny
2nd is the speed sensors
by scanning the tranny module for codes you can identify the issue

good luck

Hi:
A shift solenoid should have turned on the check engine light. Has that happened?

Your vehicle has an OBD2 computer. OBD stands for On Board Diagnostics. If the light is on, that mean there are Trouble Codes stored in the computer. When the computer is scanned, it will identify which codes are stored and from that, you can tell where the problem is coming from, or at least aprox where the problem is.

What you need to do is have the computer scanned to identify what codes are stored. Hopefully, there will be transmission codes that will point us in the right direction. I'm not sure where you are located, but most parts stores will scan the computer for free with hopes to sell you parts. Lol If you can, take the vehicle to a nationally recognized parts store, tell them your check engine light is on, and ask if they would scan it for you and tell you the codes. Once you do that, let me know what you find and it will help me to determine possible causes.

I'm glad to help. Keep in touch so I know what you find.

Joe

Staying in second gear is "limp-in" mode that lets you drive slowly to a repair shop without the need for a tow truck. The most common cause of limp-in is slippage in one of the clutch packs, however, if the speedometer quit too, suspect a problem with the input speed sensor or output speed sensor. Also, clutch slippage will generally send it into limp-in during or right after an upshift while a sensor problem will often make it start out in limp-in right away as soon as the vehicle starts to move.

Your mechanic will connect a scanner that can access the transmission computer to read the diagnostic fault codes. Those codes will lead him to the circuit or system with the problem, not necessarily the specific defective part.

Caradiodoc