P0950 Code: Auto Shift Manual Control Circuit

What the P0950 code means

In automated and automatic transmissions with a sequential mode, the lever or the steering wheel paddles send upshift and downshift commands to the computer.

It works as a switch: the computer sees a high or a low voltage depending on its position. The P0950 code means the circuit is not behaving electrically. The cause can be the sensor, the wiring or the supply.

If the signal fails, manual mode stops working, but the gearbox usually carries on in automatic. On steering wheel paddles, check the clockspring.

Always start with the simple things: fuse, relay and connector. Then check the supply, ground and signal with the component plugged in (use back-probe pins), and finally the continuity of each wire to the computer. Replace the component only if all of that checks out.

P0950 code symptoms

• Check engine light on.
• Manual mode disabled.

Likely causes of the P0950 code

1. Damaged or corroded connector. The most common cause.
2. Wiring that is cut or shorted between the sensor and the computer.
3. Failed sensor. Open or shorted inside.
4. Missing reference voltage. Check whether other sensors are also out.
5. Computer. Uncommon, so rule out everything above first.

How to diagnose the P0950 code step by step

1. Read the switch or sensor value on the scan tool and compare it with what you expect.
2. Inspect the connector for corrosion, water or loose pins.
3. Check the supply and ground with the key on: the reference should be correct and the ground should drop less than 0.1 volt.
4. Measure the signal with the connector plugged in and see whether it changes when you move the lever or paddles.
5. Do the wiggle test on the harness with the scan tool in graph mode.
6. Check continuity of each wire to the computer, which should be under 1 ohm.

How to fix the P0950 code

• Repair the connector or the wiring.
• Replace the sensor if the tests confirm it is bad.
• Correct the real condition if there is one.
• Clear the P0950 code and verify with a road test.

Technical reference data

• Switches or Hall sensors in the lever or in the paddles.
• Reference values only: check the manufacturer data for your vehicle.

Brand-specific notes

On steering wheel paddles, the clockspring is a common cause of this code. If the paddles work only at certain steering angles, look there first.

Frequently asked questions about P0950