Download the document in my sig. It is a PDF I made of trouble codes, causes and cures from information I got from Bill. It isn't a complete list but it does have information on nearly all of the codes.
Unfortunately P2106 doesn't come up in my list. Can you double check that code?
P0720 Output Shaft Speed Sensor Circuit Malfunction
P0720,"Insufficient input from Output Shaft Speed sensor.
--Description-- The output shaft speed sensor inputs a signal to the PCM, based on the speed of the output shaft of the transmission. The PCM compares this signal with the signal of the VSS or TCSS and determines correct tire size and axle gear ratio.
--Possible Causes--
- OSS sensor circuit short to GND
- OSS sensor circuit short to PWR
- OSS sensor circuit open
- Damaged OSS sensor
- Damaged PCM"
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