Code Definition

P0619 — Alternative fuel control module RAM/ROM signal error

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0619

P0619 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0619 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0619 fault code is set when the Engine Control Module (ECM) detects an error in the Random Access Memory (RAM) or Read Only Memory (ROM) of the Alternative Fuel Control Module. This module is responsible for managing the engine's operation when using alternative fuels such as natural gas, propane, or biofuels. The RAM in the module is used for temporary data storage during operation, while the ROM stores permanent software and calibration data. A malfunction in either the RAM or ROM of the Alternative Fuel Control Module can lead to issues with engine performance, fuel management, and ove...

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