P1621

Set by the manufacturer, so it means different things on different makes. 17 makes in the table below.

More codes than this one? Paste your whole scan

What P1621 means, by make 17 makes

Audi For coolant temperature signal short to ground 466D 18029
Chevrolet Control Module Long Term Memory Performance
Chrysler 5V Output Reference Voltage 1
Citroen Control Module Long Term Memory Performance/Immobilizer Code Words Do Not Match
Dodge 5V Output Reference Voltage 1
Ford Control Module Long Term Memory Performance/Immobilizer Code Words Do Not Match
Jaguar Engine control module engine immobilization input circuit malfunction
Jeep 5V Output Reference Voltage 1
Land Rover Serial Data Link Dead Fault
Mazda lmmobilizer System Fault
Mercedes-Benz Immobilizer Code Words Do Not Match
Opel Engine control module (ECM) - defective
Peugeot Control Module Long Term Memory Performance/Immobilizer Code Words Do Not Match
Saab Internal Control Module Malfunction
Saturn PCM/Memory Data/Serial Data Error
Volkswagen For coolant temperature signal short to ground 466D 18029
Volvo Engine coolant temperature signal short to ground

Each line is that manufacturer's own meaning for P1621. They are genuinely different faults, not rewordings of one, so a meaning listed against one make says nothing about the others. If your make is not listed, we do not hold it - your manufacturer's service information is the authority.

Code structure P1621

Powertrain

engine, transmission and emissions

Manufacturer-specific

Defined by the vehicle manufacturer, so the meaning varies between makes.

Fault index

identifies the specific fault

Powertrain Manufacturer-specific

Nearby codes in the P1 range

Manufacturer code meanings from kierandrewett/obd (b56a07a), used under the MIT licence. Copyright (c) Kieran Drewett. SpareRadar is not affiliated with the dataset's authors.