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P0642 Severity
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
The engine control module (PCM) sends out a 5 volt reference signal to all applicable engine sensors. If the PCM detects an incorrect output signal, it will set code P0642.
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OBD-II Code P0642 is defined as a Sensor Reference Voltage "A" Circuit Low
The engine control module (PCM) sends out a 5 volt reference signal to all applicable engine sensors. If the PCM detects an incorrect output signal, it will set code P0642.