Diagnostic Test Code (DTC) P0731 is a transmission fault code and has a generic description of "GEAR RATIO ERROR IN FIRST GEAR".
The Powertrain Control Module (PCM) monitors the input shaft speed and the output shaft speed of the transmission through the input and output speed sensors. The proper gear ratio will produce a predictable difference between the two sensors. This DTC sets when the expected difference differs greatly from the actual difference between the two speed sensor readings.
This can be caused by several things including:
> Defective input speed sensor
> Defective output speed sensor
> Defective connections or wiring between either speed sensor and the PCM
> Shorted speed sensor circuit
> Open speed sensor circuit
> Slipping clutches inside the transmission
Please note that Transmission Control Module (TCM) replacement WILL NOT correct for this code.
The speed sensor data must be monitored with the proper equipment and the speed sensor circuits must be verified for proper function to determine the actual cause of this fault.
SOURCE: Check engine light came on. Had diagnosed and
The 0506 code is an information code that says the idle speed is lower than expected, the problem code is the 2112 start here, this code refers to the throttle body not operating smoothly, you can remove it and clean it, check for smooth operation and check the TPS at the same time, if you cannot get a smooth operation you will need to replace the throttle body assembly, reset the check engine light and verify your repair. Hope this helps, let me know
SOURCE: I have a 1996 chrysler
P0420 Catalyst efficiency below range.
P0731 A/T Additional Gear Ratio Error In First Gear
Your catalytic converter could be clogged up or just bad. Or, you could have a leak before the catalyst.
The other code suggest you have an internal transmission problem that is mechanical and cannot be fixed without taking the transmission apart.
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