Error Code P0950 is defined as Auto Shift Manual Control Circuit. This is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made since 1996 up to the present. Of course, specifications on the definition, troubleshooting, and repairs vary from one make and model to another.

This code applies to vehicles with an automatic transmission with a manual shifting feature, which allows the driver to control the gears changes manually by placing the shift levers into a special gate next to the PRNDL labels.

Error Code P0950 indicates that the powertrain control module (PCM) has determined that the auto shift manual control is not at the predetermined limit. This means there is a problem with the electrical circuit that allows this code to take place.

Common Symptoms

  • Check engine light illumination
  • Disabled manual shifting function

Possible Causes

  • Faulty connectors or wirings
  • Defective transmission switch

How to Check

This code is often caused by faulty wiring. Thus you can start the diagnosis by inspecting the connectors and wires. Look for any signs of corroded connectors or damages and wear and tear in the wires. These usually happen due to liquid being spilled into the transmission shifter.

Make sure to check all connectors around the shift mechanism as well.

Also, inspect the transmission shift switch for corrosion and damage.

How to Fix

  • Repair or replacement of damaged or corroded connectors or wirings
  • Replacement of transmission shift switch

This code will not significantly affect the drivability of the vehicle or cause serious internal damages. However, you will not be able to use the manual shift feature of the vehicle.