SureTrack Real Fix: Exhausting the Volks’ Valve

Real Fixes from the SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version.

This fix illustrates the power of the SureTrack community to quickly help a fellow tech solve a diagnosis problem. A SureTrack community member had a 2018 diesel, Volkswagen Transporter in the shop with the check engine light on and code P0401-00. They posed the question to the community and with the help of fellow community members, they were able to resolve the issue quickly.

The following Community Fix summarizes the interaction between members of the community that led to the solution.

Vehicle
2019 Volkswagen Transporter 2.0 Diesel

Title
Code P0401-00, Replaced Exhaust Gas Recirculation Valve

Complaint
The customer states the check engine light is on.

Cause
Connected a scan tool and found code P0401-00 – Exhaust Gas Recirculation (EGR) System: Insufficient Flow Detected. Used the scan tool to monitor live data and found the exhaust gas recirculation valve parameter was below specifications. Used the scan tool to repeatedly command the exhaust gas recirculation valve open and closed, monitored the valve position parameters on the scan tool and found the valve actual position parameter never matched the valve desired position parameter. Disconnected the exhaust gas recirculation valve connector, visually inspected the connector and terminals and found no obvious signs of damage. With the key on, engine off, used a multi-meter to check for the presence of voltage and ground at the exhaust gas recirculation valve and found both were present. Used the multi-meter to measure the resistance of the exhaust gas recirculation valve and found the measured resistance was within specifications. Removed the exhaust gas recirculation valve, performed a visual inspection of the exhaust gas recirculation valve and found it was clogged with carbon. The results of these tests verified the exhaust gas recirculation valve was faulty.

Correction
Replaced the exhaust gas recirculation valve, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.


SureTrack® is a powerful value-added feature available with select Snap-on diagnostics tools. It offers an exclusive combination of expert knowledge and detailed parts replacement records, all wrapped in an interactive community.

Want more? Click here for more information on using SureTrack.

New or Expired SureTrack users: Click here for authorization key instructions.

About the Author

Abagail Lucero

Abagail Lucero is the Product Marketing Manager for ProDemand. She joined the company in 2011 as a member of the SocialCRM shop marketing team and has served in many roles at Mitchell1, lastly as Security and Compliance Supervisor. Abagail holds a Bachelor of Science degree from California University of Pennsylvania.