Rear main seal blowout after PCV valve freeze
ENGINE
34 NHTSA complaints · 2022-12 → 2026-05
“WHILE DRIVING DURING A SHORT SPELL OF TEMPERTAURES AROUND 0 DEGREES THE REAR MAIN SEAL ON THE ENGINE BLEW OUT. THIS WAS DUE TO CONDENSATION FREEZING IN PVC PORT OF ENGINE”
“The vehicle was towed to an independent mechanic, who determined that the PCV valve was clogged due to the cold weather. The clogged PCV valve caused the rear main seal to fail”
“I had the car towed to the nearest Chevy dealer and they said that the PVC port froze which created crankcase pressure and blew out the rear main seal”