DIY EVAP Leak Diagnosis | Step By Step Guide to Troubleshooting EVAP System DTC Codes | AutoLine Pro

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Presented by AutoLine Pro in collaboration with Rodrigo Rivera, automotive professor and owner of Rivera's Transmissions in Santa Ana, CA.

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Troubleshooting P0 Codes can be tricky, especially if it involves the EVAP System because it can be tough to find where the problems are happening. That's why we are here to help you learn how to troubleshoot and diagnose your car's mechanical problems.

WHAT ARE DIAGNOSTIC TROUBLE CODES?
If a leak is detected, the PCM may set a Diagnostic Trouble Code (DTC). These DTCs generally are 5-digits in this format: P04xx. The P means Powertrain computer, where the DTC is stored, the 0 means it is a generic code for all carmakers, and the 4 means EVAP system. The last two digits define the type of problem: low flow, electrical problem, small leak, large leak. You can retrieve these DTCs with an inexpensive code reader. The driver will notice that there is a problem because the amber “Check Engine” or “Service Engine Soon” MIL (Malfunction Indicator Lamp) is illuminated.

P0441 - Evaporative Emission System Incorrect Purge Flow
P0442 - Evaporative Emission Control System Leak Detected (Small Leak).
P0455 - System Gross Leak Evaporative Emission
P0456 - Evaporative Emissions System - Small Leak Detected
P0457 - Evaporative Emission System Leak Detected (Fuel Cap Loose/Off)

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