P0619 OBD-II Trouble Code: Alternative Fuel Control Module RAM/ROM Error

P0619 code definition

A P0619 trouble code indicates a problem in the alternative fuel control module random access memory/read-only memory. In addition to the Powertrain Control Module (PCM), this type of issue can be detected by the following modules: the antilock brake control module, the anti-theft module, the body control module, the climate control module, the cruise control module, the fuel injection control module, the instrument panel control module, proximity alert module, the traction control module, and the turbo control module. One similar code to a P0619 code is a P0618 trouble code.

What the P0619 code means

The storage of a P0619 trouble code indicates that the alternative fuel control module random access memory/read only memory has suffered an error. While most vehicles also illuminate a Check Engine light upon storing the P0619 trouble code, some models require multiple drive cycles, up to eight, before the lamp illuminates.

What causes the P0619 code?

The most common cause of a P0619 trouble code is a faulty alternative fuel control module. Some other causes can include faulty wiring or connectors within the Control Area Network (CAN) Bus harness, a loose ground strap or broken wire within one of the control modules, and a faulty CAN Bus.

What are the symptoms of the P0619 code?

Symptoms of a P0619 trouble code include engine stalling, rough idling, poor acceleration, problems shifting, and a reduction in the vehicle's fuel efficiency.

How does a mechanic diagnose the P0619 code?

To successfully diagnose a P0619 trouble code, the mechanic needs an OBD-II scanner, a digital volt/ohmmeter, a CAN Bus system wiring diagram, and a specialized CAN scanner. The mechanic also needs to complete the following steps:

• Begin by visually inspecting all wiring, connectors, and other components, looking for any fault, corrosion, or other damage.
• Hook up the scanner to the diagnostic connector and download any stored codes and freeze frame data. This allows the mechanic to clear the codes in the order that they were stored.
• Using the specialized scanner, test the pins of the CAN Bus. Disconnect any related control modules before doing so to prevent damage and memory loss. Also, install a memory saving device to help with memory loss prevention.
• Use the digital volt/ohmmeter to check the reference voltage and ground signal of the system circuitry, connectors, and fuses. Test the control module ground circuits for continuity with the battery ground.
• In addition, the mechanic can use a CAN Bus system wiring diagram to check the continuity between the related control modules with the digital volt/ohmmeter.
• Clear the code and test the system to see if the trouble code returns.

Common mistakes when diagnosing the P0619 code

When diagnosing trouble codes on the PCM, mechanics need to 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 subsequently leads to the problem not being fixed and the code returning.

How serious is the P0619 code?

Left unfixed, a P0619 trouble code can lead to problems with the engine in the form of misfires, acceleration, and fuel mileage. In addition, the problems associated with a P0619 trouble code can lead to harsh shifting with the vehicle in question.

What repairs can fix the P0619 code?

When repairing a P0619 trouble code, the mechanic should perform the following:

• Replace any damaged or faulty wiring, connectors, or components. This includes circuitry associated with the various related control modules. When 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, as this is often the cause of the storage of a P0619 trouble code.

Need help with a P0619 code?

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