Cadillac P16F4: Control Module Transmission Range Control Performance

What Does The Cadillac P16F4 Code Mean?

This code indicates that:

• The transmission direction, indicated by both the internal mode range and direction switch circuits, are valid but do not match.
• One internal mode range direction switch circuit has failed.
• The hybrid powertrain control module calculates a transmission direction base upon the remaining internal mode range direction circuits.
• The calculated hybrid powertrain control module transmission direction does not match the direction indicated by the internal mode range switch circuits.
• One internal mode range direction switch circuit has failed.
• The hybrid powertrain control module calculates a transmission direction based upon the remaining internal mode range direction circuits.
• The internal mode range switch indicated a transitional position.
• One internal mode range direction switch circuit has failed.
• The hybrid powertrain control module calculates a transmission direction based upon the remaining internal mode range direction circuits.
• The TCM has indicated at least one internal mode range switch circuit has failed.
• More than one internal mode range direction circuit has failed and the hybrid powertrain control module cannot calculate a transmission direction.
• The internal mode range switch indicates a transitional position.
• More than one internal mode range direction circuit has failed and the hybrid powertrain control module cannot calculate a transmission direction.
• The TCM has indicated at least one internal mode range switch circuit has failed.

Conditions for setting the DTC: The ignition is ON. Ignition voltage is at least 8 V and no more than 18 V.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> GM Genuine Parts 29542692 Automatic Transmission Range Select Lever Position Switch
>>> GM Genuine Parts 24276411 Transmission Control Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

GM, 2016, Service Bullettin – Unable to Perform Transmission Range Control Module Range Motor Position Learn.