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P0400 – Exhaust gas recirculation (EGR) system -flow malfunction
P0090 and limp mode | Chevy and GMC Duramax Diesel Forum
Chevy Express P0440: Evaporative Emission Control System Malfunction
Engine Code p0401 Meaning, Causes, Fixes (4 Step Repair Guide) - Proper
Trouble Code P0670: Chevy Duramax 2005 Glow Plug Control Module Q&A
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EGR Code P0401 DONT REPLACE EGR "Insufficient Flow Detected" - YouTube