P0955Generic code

P0955 Code: Auto Shift Manual Mode Circuit

The P0955 code means the computer found an electrical fault in the circuit that tells it the driver has picked manual (sequential) mode. The main effect is that manual mode does not work. Check the fuse, relay and connector first, since the lever itself is a simple switch.

Severity
Low
Can I keep driving?
Yes, no immediate risk
Estimated cost
$30 to $300
Difficulty
Medium
System
Transmission
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0955 code means

A switch tells the computer that the driver has selected the manual (sequential) mode of the gearbox.

It is a plain switch: the computer sees a high or a low voltage depending on its position. The P0955 code means the circuit is not behaving electrically. The cause can be the sensor, the wiring or the supply.

When the signal fails, the gearbox does not go into manual mode, or it drops out of it for no reason.

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.

P0955 code symptoms

  • Check engine light on.
  • Manual mode that does not work.

Likely causes of the P0955 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 P0955 code step by step

  1. Read the switch value on the scan tool and compare it with the position of the lever.
  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.
  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 P0955 code

  • Repair the connector or the wiring.
  • Replace the switch if the tests confirm it is bad.
  • Correct the real condition if there is one.
  • Clear the P0955 code and verify with a road test.

Technical reference data

  • Switch in the lever.
  • Reference values only: check the manufacturer data for your vehicle.

Brand-specific notes

This code is common on levers that are dirty or have had liquid spilled into them. Cleaning around the shifter is a good first step.

Frequently asked questions about P0955

Can I drive with a P0955 code?
Yes, with caution. The car normally keeps running, but you may lose manual mode.
Does the sensor have to be replaced?
Only if the tests confirm it. The connector and the wiring fail just as often as the switch does.
What does the manual mode of the gearbox do?
A switch tells the computer that the driver has selected the manual (sequential) mode of the gearbox.
How much does it cost to fix P0955?
As a rough guide, between $30 and $300. Cleaning or repairing a connector is cheap, and a new lever switch costs more.
What does the P0955 code mean?
It means there is an electrical problem in the manual mode circuit. The computer cannot read the switch properly.
What is the most common cause of P0955?
A damaged or corroded connector. On levers, dirt and spilled drinks are a frequent cause too.

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Questions about the P0955 code

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