Error Code P0954 is defined as Auto Shift Manual Control Circuit Intermittent. 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.
The advancement in technology allows many manufacturers to put manual gear selections on their automatic transmission through up/down gear level or paddle shifters on the steering wheel. This type of system is controlled by a number of sensors, actuators, and wires. If the powertrain control module (PCM) determines an intermittent electrical problem on the circuit, it will register the Error Code P0953.
- Check engine light illumination
- Disabled manual shifting function
- Faulty connectors or wirings due to corrosion or wear and tear
- Defective transmission shift 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.
If there are no broken connectors or frayed wires, then check the transmission manual shift switch/up and down switch and look for signs of water 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.