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Fault code

P1729 fault code.

This code comes up with one known fault.

Manufacturer specific code

Code type

Engine and drivetrain

System

Opel: fault in the gearbox actuator circuit

Opel Easytronic code. The transmission control unit measured a fault in the circuit of the actuator that moves the gears. It usually appears together with P1607 and P1728.

The code tells you what the control unit measured, not which part has failed. The same code has several possible causes.

This is a manufacturer specific code. Its meaning differs by brand, so there is no answer to it without knowing the model.

Which known faults it comes up with

Easytronic: automated manual gearbox, clutch and shift actuator

expensive

The Opel Easytronic is not a conventional automatic: it is an ordinary manual gearbox in which electric actuators operate the clutch and change gear. There is no torque converter, and the drive breaks for a moment when it shifts.

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The typical faults are: clutch and shift actuator failure, clutch wear, and lost adaptation values. Symptoms: jerking when pulling away, delayed or harsh shifts, an "F" warning, a stuck gear, and no creep.

Removal and refurbishment often come to 2,500 to 3,000 euro. On an old Corsa or Astra that can cost more than the car. A software update and an oil change sometimes help if it only jerks, but an actuator fault means replacing the part.

between 80,000 and 180,000 km2,500–3,000 EUR

What to check

  • Try it cold and warm: pulling away, creep, 1 to 2 and 2 to 3 shifts. Jerking or delay is suspect
  • Watch for the "F" or gearbox warning on the dash
  • Ask for a fault code read with Opel compatible diagnostics (not just generic OBD): actuator codes of the P1607 / P1728 / P1729 kind
3 more steps in the write-up

Information, not an expert opinion

We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.

  • A fault on the list does not mean the car you are looking at has it.
  • A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
  • You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.
Details in the terms