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Volvo engine code DTC P06B1
5 Volt ECM Supply: Supply #1 The 5 Volt sensor supplies are is located in the Engine Electronic Control Unit (EECU). Some sensors, especially pressure sensors, require 5 Volt supply to operate. They are fed by three 5 Volt supplies in the EECU (referred as #1, #2 and #3 below). If the 5 Volt supply fails or the feed is shorted to ground or battery the above/below range monitoring reports this. If it occurs, none of the readings from the sensors connected to the failing supply is reliable. P06B1 ECM Supply #1: Below Range DTC P06B1 Component / System ECM Supply #1 Monitor Strategy Description Below range Fault Limit Voltage Sensed < 4.5 V Enable Conditions • Key On Active • Battery Voltage > 8 V Disable Conditions No Active DTC's: • N/A Time Required For DTC To Be Set 5 seconds MIL Illumination 2 Drive Cycles