P0619 OBD Error Code: Problem & Solutions

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Is your vehicle’s Check Engine Light illuminated? Are you experiencing sudden decrease in engine power and acceleration? Is there a drop in the fuel economy with increased level of emissions? All these indicate problem with the fuel control module and the Powertrain Control Module, thus flashing OBD Code P0619 error.

OBD-II Code Engine may not start is defined as an Alternative Fuel Control Module RAM/ROM Error.

OBD code P0619 means that the powertrain control module (PCM) has detected a malfunction with the alternative fuel control module (AFCM). The issue occurs in the random access memory (RAM)/read-only memory (ROM) portion of the AFCM. The P0619 code is limited to vehicles that use alternative fuels such as natural gas and electricity for propulsion. In some cases, the AFCM and PCM may be separate from one another. More often, they are integrated into a single module. This increases controller efficiency in addition to saving automakers space, time, and money.

RAM allows the PCM and other controllers to rapidly (and randomly) access bits of data needed to configure fuel delivery and ignition timing strategy in order to keep the vehicle functioning smoothly. RAM may be manipulated by the PCM an infinite number of times in order to maintain desired parameters. ROM is data memory that is monitored (read only) by the PCM for purposes of calculating various drivability functions.

Each time the ignition is turned on and the PCM is energized, multiple controller self-tests are performed. In addition to running internal controller self-tests, the controller area network (CAN) is used to compare signals from each individual module to ensure that the various controllers are interacting properly. If a problem is detected in monitoring internal AFCM/PCM RAM/ROM function, a code P0619 will be stored and a malfunction indicator lamp (MIL) may be illuminated,. Depending upon the perceived severity of the malfunction, multiple failure cycles may be necessary for MIL illumination.

What causes this problem with the Alternative Fuel Control Module RAM/ROM Error?

• Faulty Alternate Fuel Control Module/Powertrain Control Module
• Alternate Fuel Control Module/Powertrain Control Module programming error
• Open or shorted circuit or connectors in the CAN harness
• Failed Alternate Fuel Control Module/Powertrain Control Module power source
• Insufficient control module ground

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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0619 here:

Common Symptoms

• Drivability issues
• Harsh shifting
• Decreased fuel economy,
• Engine may stall or run rough at idle,
• Poor acceleration,
• A stored trouble code, and possibly an illuminated service engine soon lamp

Want to correct the Trouble Code P0619? Read these points mentioned below:

• Replace any damaged or faulty wiring, connectors, or components. This includes circuitry associated with the various related control modules
• Replacing wiring within the CAN Bus harness, it is easier to replace the whole harness as opposed to individual wiring
• Replace any faulty control modules, especially the alternative fuel control module

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0619 code to be stored:

Even the most experienced and well-equipped professional technician may find diagnosing a code P0619 to be quite a challenge. Without the necessary reprogramming equipment, it will be impossible to replace a defective controller and complete a successful repair.

If AFCM/PCM power supply codes are present, they will need to be repaired before attempting to diagnose a P0619. There are several preliminary tests that can be performed prior to declaring any controller defective.

A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information will be required. Connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. Note the information down, clear the codes and test drive the vehicle until the code is reset or the PCM enters readiness mode.

Use your source of vehicle information to obtain connector face views, connector pin-out charts, component locators, wiring diagrams, and diagnostic flow charts related to the code and vehicle in question. Use the DVOM to test controller power supply fuses and relays. Replace blown fuses as required. Fuses should be tested with the circuit loaded. If all fuses and relays appear to be functioning as intended, a visual inspection of controller related wiring and harnesses is in order.

Check the chassis and engine ground junctions. Use your vehicle information source to obtain ground locations for related circuits. Use the DVOM to test ground integrity. Visually inspect system controllers for signs of water, heat, or collision damage.

Any controller that is damaged, especially by water, should be considered defective. If controller power and ground circuits are intact, suspect a defective controller or a controller programming error. Controller replacement will require reprogramming. In some cases, you may purchase reprogrammed controllers through aftermarket sources. Other vehicles/controllers will require on-board reprogramming that may only be done through a dealership or other qualified source.

Common Mistakes When Diagnosing the P0619 Code

Always clear the codes in the order they were stored. A common mistake with a P0619 trouble code occurs when this procedure is not followed. Most often a mechanic will treat the symptoms that occur as a reaction to the communication failure and not the original source of the code, a failure on the part of the Alternative Fuel Control Module RAM/ROM. This will eventually lead to the problem not being fixed and the code returning.

P0618 - Alternative Fuel Control Module KAM Error