P0956Generic code

P0956 Code: Auto Shift Manual Mode Circuit Range/Performance

The P0956 code means the manual mode circuit gives a reading that is electrically valid but does not match what the computer expects. Manual mode may not work. A multimeter will not find this, so compare the reading with what the lever is really doing.

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 P0956 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 P0956 code is a range fault: the sensor is measuring, but measuring wrong, or there is a real abnormal condition.

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

This kind of fault usually does not show up with a multimeter, because everything looks fine electrically. You have to compare what the part reports with reality: use a gauge, a thermometer or a tachometer, or command the component with the scan tool and see whether the physical result matches the order.

P0956 code symptoms

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

Likely causes of the P0956 code

  1. Sensor that has aged or drifted. It gives believable readings that are wrong.
  2. A real abnormal condition. The system truly operates outside normal.
  3. High resistance in the connector. Corrosion shifts the reading.
  4. Port, hose or tone wheel that is damaged or blocked, depending on the type of sensor.

How to diagnose the P0956 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 P0956 code

  • Repair the connector or the wiring.
  • Replace the switch if the tests confirm it has drifted.
  • Correct the real condition if there is one.
  • Clear the P0956 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. A switch that is gummed up can read plausible but wrong values.

Frequently asked questions about P0956

Can I drive with a P0956 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 P0956?
As a rough guide, between $30 and $300, depending on whether it is a connector, dirt in the lever or the switch itself.
What does the P0956 code mean?
It means the manual mode signal is plausible but does not agree with what the computer expects.
Will a P0956 code clear itself?
Only if the reading goes back to normal and stays there. A drifting switch or a dirty lever will bring it back.

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Questions about the P0956 code

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