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P0906 – Gate Select Position Circuit Low (OBD2)

P0906 means "Gate Select Position Circuit Low". The voltage the control unit measures in the automated manual gearbox actuators circuit is below the permitted minimum. For a sensor this usually means the signal wire is shorted to ground or the reference voltage is missing; for an actuator, that its control wire is shorted to ground.

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P0906 quick summary

Fault codeP0906
MeaningGate Select Position Circuit Low
SystemPowertrain (Engine & Transmission)
VehiclesGeneric OBD2
SeverityHigh
Can I drive?Not recommended. The gearbox may fail to select gears or get stuck in neutral.
Repair cost€50 – €2,000

How automated manual gearboxes select gears

Automated manual gearboxes use electric or hydraulic actuators to select the gate and shift gears; these codes cover gate select and gear shift position sensors, actuators, the shift lock and the adaptive shift (ASM) controls.

An automated manual gearbox is a manual gearbox with actuators instead of a driver. One actuator moves the selector left and right (gate select), another forward and backward (gear shift); position sensors report where the selector is. A clutch actuator operates the clutch.

Codes P0904–P0931 cover the gate select and gear shift position circuits, actuators and the gear shift lock solenoid; P0949–P0959 cover the adaptive shift management (ASM) learning and mode/control circuits.

Typical faults are worn actuators, position sensors out of calibration, low hydraulic fluid, wiring problems and missing adaptations after repairs.

On VAG vehicles (VW, Audi, Škoda, Seat, Cupra), VCDS and older VAG testers can show this code as the five-digit VAG code 17290 (P0906). Both numbers mean the same fault.

Symptoms of P0906

  • Gearbox does not select a gear or stays in neutral
  • Slow or jerky gear changes
  • Gear display flashing
  • Warning messages
  • Engine does not start (not in neutral)

Most common causes of P0906 (most likely first)

Mechanic's Pro Tip

After disconnecting the battery, many automated manual gearboxes need a learning procedure before they shift properly again – check that first if problems start after a battery change.

  1. 1.Signal or control wire shorted to ground

    Most likely

    Look for chafed insulation where the harness touches the engine, exhaust brackets or body edges.

  2. 2.Missing 5 V reference or supply voltage

    An open reference wire or a shorted sensor elsewhere on the same reference circuit can pull it down.

  3. 3.Internal short in the automated manual gearbox actuators

  4. 4.Worn or faulty gate select or gear shift actuator

  5. 5.Position sensor out of calibration

  6. 6.Low hydraulic fluid or leak (hydraulic systems)

  7. 7.Wiring or connector fault

Step-by-step diagnostic guide

  1. 1

    Read codes and positions

    Read the gearbox codes and watch the gate and shift positions in live data.

  2. 2

    Measure the signal voltage

    With the ignition on and the automated manual gearbox actuators plugged in, back-probe the signal wire. Then unplug it and check the reference/supply and ground wires separately.

    Multimeter: Signal near 0 V = short to ground or no reference. Reference wire: about 5 V with ignition on. Signal wire to ground with connector unplugged: no continuity.

  3. 3

    Check fluid (hydraulic systems)

    Check the hydraulic fluid level and look for leaks.

  4. 4

    Check actuators

    Run actuator tests and check movement and current draw.

  5. 5

    Check wiring

    Check sensor supplies and signals and actuator wiring.

  6. 6

    Repair and calibrate

    Replace the faulty part and run the gearbox learning procedure (ASM adaptation).

Frequently asked questions

Can I keep driving with P0906?

Not recommended. The gearbox may fail to select gears or get stuck in neutral.

How much does it cost to fix P0906?

Typical repair costs are 50 € – 2000 €, depending on the cause and the vehicle. The most common fixes are: signal or control wire shorted to ground; missing 5 V reference or supply voltage; internal short in the automated manual gearbox actuators. Always confirm the cause with the tests above before buying parts.

What is an automated manual gearbox?

A manual gearbox where actuators change gears and operate the clutch automatically.

Why does my car not start after a gearbox fault?

The engine may only start in neutral; if the gearbox cannot confirm neutral, starting is blocked.

What is the difference between P0906 and similar codes?

P0906 belongs to a group of codes for the same component that differ in the type or location of the fault: P0904 – Gate Select Position Circuit [senses left / right position]; P0905 – Gate Select Position Circuit Range/Performance; P0907 – Gate Select Position Circuit High; P0908 – Gate Select Position Circuit Intermittent; P0909 – Gate Select Control Error; P0910 – Gate Select Actuator Circuit / Open [left / right motion]. The tests on this page apply to the whole group; the type of fault tells you where to start.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.