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P0929 – Gear Shift Lock Solenoid Circuit Range/Performance (OBD2)

P0929 means "Gear Shift Lock Solenoid Circuit Range/Performance". The automated manual gearbox actuators signal is electrically present but implausible: it does not match what the control unit expects for the current operating conditions or from other sensors. This is a performance fault, not a broken wire.

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P0929 quick summary

Fault codeP0929
MeaningGear Shift Lock Solenoid Circuit Range/Performance
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 17313 (P0929). Both numbers mean the same fault.

Symptoms of P0929

  • 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 P0929 (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.Automated manual gearbox actuators worn, contaminated or out of calibration

    Most likely

    The signal drifts slowly, so it is still within the electrical limits but wrong.

  2. 2.Mechanical problem in the system the automated manual gearbox actuators measures or controls

    For example a leak, a sticking part or a restriction that really changes the measured value.

  3. 3.High resistance in a connector or ground

    Corrosion causes a voltage drop that shifts the reading.

  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

    Compare live data with expected values

    Read the automated manual gearbox actuators values in live data and compare them with related readings (engine speed, load, temperature or pressure) and with the specification. A value that is electrically fine but wrong for the conditions confirms a performance fault – then check the mechanical side before replacing the part.

  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 P0929?

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

How much does it cost to fix P0929?

Typical repair costs are 50 € – 2000 €, depending on the cause and the vehicle. The most common fixes are: automated manual gearbox actuators worn, contaminated or out of calibration; mechanical problem in the system the automated manual gearbox actuators measures or controls; high resistance in a connector or ground. 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 P0929 and similar codes?

P0929 belongs to a group of codes for the same component that differ in the type or location of the fault: P0926 – Gear Shift Reverse Actuator Circuit Low; P0927 – Gear Shift Reverse Actuator Circuit High; P0928 – Gear Shift Lock Solenoid Circuit / Open; P0930 – Gear Shift Lock Solenoid Circuit Low; P0931 – Gear Shift Lock Solenoid Circuit High; P0949 – ASM Adaptive Learning Not Done. 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.