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P0920 – Gear Shift Forward Actuator Circuit / Open [forward motion, odd gears, 1,3,5] (OBD2)

P0920 means "Gear Shift Forward Actuator Circuit / Open [forward motion, odd gears, 1,3,5]". The control unit sees an open circuit: the electrical connection to the automated manual gearbox actuators is interrupted, so no current can flow when the component is commanded or read.

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P0920 quick summary

Fault codeP0920
MeaningGear Shift Forward Actuator Circuit / Open [forward motion, odd gears, 1,3,5]
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 17304 (P0920). Both numbers mean the same fault.

Symptoms of P0920

  • 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 P0920 (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.Unplugged, loose or corroded connector

    Most likely

    Often after previous repair work in the area.

  2. 2.Broken wire in the harness

    Typical at bends, near the engine mounts and where the harness rubs on brackets.

  3. 3.Burnt-out winding or internal break 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.Adaptation not performed after repair or battery work

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 resistance and continuity

    Unplug the automated manual gearbox actuators and measure its resistance across the terminals. An infinite (OL) reading confirms an internal break. If the component is fine, check each wire back to the control unit for continuity.

    Multimeter: Solenoids and heaters typically read a few ohms to a few dozen ohms; "OL" means open. Wire continuity: below about 1 Ω.

  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 P0920?

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

How much does it cost to fix P0920?

Typical repair costs are 50 € – 2000 €, depending on the cause and the vehicle. The most common fixes are: unplugged, loose or corroded connector; broken wire in the harness; burnt-out winding or internal break 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 P0920 and similar codes?

P0920 belongs to a group of codes for the same component that differ in the type or location of the fault: P0917 – Gear Shift Position Circuit High; P0918 – Gear Shift Position Circuit Intermittent; P0919 – Gear Shift Position Control Error; P0921 – Gear Shift Forward Actuator Circuit Range/Performance; P0922 – Gear Shift Forward Actuator Circuit Low; P0923 – Gear Shift Forward Actuator Circuit High. 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.