P0642 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0642 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0642 code.

What Does P0642 Code Mean?

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.

P0642 Symptoms

• Engine may not start

Common Problems That Trigger the P0642 Code

• Engine sensor failure
• Powertrain Control Module (PCM) failure
• Wiring issue