Transmission not shifting to last gear

This is most likely a speed sensor but if this code continues then we need to run through the testing that I am attaching below.

This code is going to cause shifting issues and it sounds like the ECM is causing a down shift/jerking or a failure to engage the torque converter for overdrive.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

The only thing we can do at this point is run through this testing and make sure we fix this code before we move onto a solenoid or torque converter issue.

Sounds good. Let us know how it turns out. Thanks for the update.

Great question. They did not do a good job with remaining clear on this, as most all vehicles have a single sensor called a vehicle speed sensor. However, this is not talking about this single sensor (if equipped on this vehicle which I don't think it is). What they are saying is the vehicle speed signal is coming from the ABS module after it takes the 4-wheel speed signals and gets an average which will be the vehicle speed signal.

Take a look at the first attachment below where the ABS/Skid control is getting 4 arrows pointing to it from the "speed sensors, " these are the four-wheel speed signals which gets turned into a single signal which is the vehicle speed signal.

I am attaching a guide to test the speed sensors. This is the best way to test each sensor individually. If you are going to test the combined pulses, then you really need a scan tool to just monitor the calculated speed.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

As for if one sensor is not reading correctly, it can affect the performance but normally the ABS will see that one wheel is not the same speed as the others and ignore it so that the speedometer and odometer are not off.

Thanks for picking that up. I will review it and make the changes. Thanks

Yes. In fact, that would be the best tool to monitor them.

I don't have a known good pattern on your specific vehicle, but you would need to monitor each speed sensor and then the one that is faulty would stand out.

I am attaching a pattern from a standard speed sensor so I am sure your vehicle will look the same.

No problem. This is why we are here.

I am attaching the diagrams that are specific to this system. However, these signals are on what are called CAN communication networks.

Here is a guide that talks about these networks in case you need it:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Basically, the signals are given directly to the ABS, then they are sent to the combination via this bus network, then the combination meter decodes this message and then codes it again to send it to the ECM where it is able to decode it as well.

While that diagram showed it as a linear progression that is a little misleading. Meaning it does not go from one to another. The ABS sends this out on the network so the Combination and PCM get the message basically at the same time.

Take a look at this and let us know if you need more info.

You are welcome. Let us know how you make out and for continuing to use 2CarPros.

Sorry. You are correct. I didn't notice that. These are going to be the network lines, so I am attaching the entire diagram for the CAN network which includes these modules and the pins in the connector they are.