U0164: Lost Communication with HVAC Control Module | Trouble Code Diagnose Symptom Cause Explain Fix
P049B code: Exhaust Gas Recirculation (EGR) B Flow Insufficient Detected | How to Fix It Easily!
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Last Updated: September 28, 2026
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Summary
A strong smell of unburnt fuel and a failed emissions test means your exhaust gas recirculation system needs immediate attention. Are you worried about a failed smog test or hearing a strange knocking sound from your engine? I am going to explain how to fix ... For diesel owners with a Ford Powerstroke or Dodge Cummins, Outlet temperature sensor 3245 2015 Volvo D 13. P0064 | P0064 HO2S Heater Control Circuit High Bank 2 Sensor 3 | P0464 | P0464 Fuel Level Sensor Circuit Intermittent | U0164: Lost Communication with HVAC Control Module | Trouble