P1604

Set by the manufacturer, so it means different things on different makes. 16 makes in the table below.

More codes than this one? Paste your whole scan

What P1604 means, by make 16 makes

Audi Internal Control Module, Driver Error
BMW Control Module Self-Test, Speed Monitoring
Chevrolet Loss of IPC Serial Data
Chrysler PCM Internal Dual-Port RAM Read/Write Integrity Failure
Citroen Code Word Unregestered
Dodge PCM Internal Dual-Port RAM Read/Write Integrity Failure
Fiat Main relay
Ford Code Word Unregestered
Jeep PCM Internal Dual-Port RAM Read/Write Integrity Failure
Mazda Immobilizer System Fault
Mercedes-Benz Code Word Unregistered
Opel Engine control module (ECM) - defective
Peugeot Code Word Unregestered
Saab Internal Control Module Malfunction
Volkswagen Internal Control Module, Driver Error
Volvo Internal Control Module Driver Error

Each line is that manufacturer's own meaning for P1604. 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 P1604

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.