Muz84

Thanks for the great support. After doing whatever I could do, I took vehicle to dealer. The fault code my obd reader was reading turned out to be wrong. The actual fault code reported by techstream is P0AA6 High voltage insulation fault. So your initial suspicion could be right. Dealer believe the A/C compressor causing short circuit due to wrong oil. I have not replaced oil or refrigerant in last 2 years since I owned the vehicle. Is there anything I can try before following their very costly recommendation to replace the A/C compressor and flush out the system? I once washed off the engine block and top of compressor with garden hose followed by degreaser spray (due to oil leak). Could that cause rust in high voltage connection on compressor or something similar and is it worth checking? Is it safe to unplug that to have a look, after disconnecting 12v battery? Is it easy to disconnect without special tool? Diagnosis data including Freeze frame data and short wave graph is attached.

Thanks for quick reply. You’re right the code could be related to circuit not the sensor itself as I have replaced engine MAF sensor but that did not solve the issue. My vehicle is RX400H hybrid and AC compressor is high voltage electric compressor operated by hybrid battery. Would that still load up the engine? Could this code be related to any mass air flow in the hybrid battery compartment as the quoted post from Richard indicated? May be when AC on, hybrid battery needs more air circulation that it’s not getting due to clogged fan or something?

Hi, I have kind of weird problem with my RX400H 2007. When I turn my air con on, I get Check Hybrid and Check VSC message displayed with check engine light, traction light and red triangle. Scanning tool displays P010A code (Mass Air Flow B Circuit Malfunction). Just to make sure, I ran vehicle for about a month without turning on A/C (blower was on most of the time) and no errors. When I turned on A/C today, same error came up. I’m unable to understand what air con and MAF circuit to do with each other. The vehicle keeps running fine when error comes but doesn’t start after turning off, until code is cleared or battery terminal is removed and replaced. I’ll really appreciate help solving the issue.