2011 Sonata Hybrid No Start Ready light flashing

James Technician New York Posted   Latest   Edited  
Unsolved
High Voltage - Hybrid & Electric Vehicles
Driveability
Electrification
2011 Hyundai Sonata Hybrid 2.4L (4) 6-spd (A6MF2H)
P0A0F — Engine Failed to Start
No Start Ready Light Flashes
Crank / No Start

Only codes pulled from the hybrid module was P0A0F, No other codes in ECU Or any other module. I'm stuck, I thinks its the power relay, but need a testing plan for this car to make sure im not throwing parts at it. Alldata gives me no info on how to test the system. The regular 12v side of the the system is charged so, that rules out the battery.

James 

… LLC

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Interesting
Saifullah Diagnostician
Ontario
Saifullah
 

Address it as an internal combustion no start. Check spark, fuel pressure etc. Has nothing to do with contact relays. Make sure the belt for the starter/generator is intact.

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Rassiel Technician
Florida
Rassiel
 

Put a 22 on the crank its probably seized

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Agree
Matt Technician
Massachusetts
Matt
 

Hi James, Does the engine crank when commanding Ready On? Keep in mind cranking speed is about 1,000 RPMs so don't be fooled. It can sound like it's running but not actually be. If the engine doesn't crank I would check the voltage level of the hybrid battery. Has anyone else looked at the car before you? If so, they could have extensively cranked the engine over and drained the hybrid battery…

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James Technician
New York
James
 

Autel maxisys. The hybrid battery is dead. No one else has touched the car. It’s a friend of Mines and they had the car towed to my Shop when it stopped..

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Matt Technician
Massachusetts
Matt
 

If the hybrid battery is dead the engine won't crank. You'll need to charge the battery some how or install a used one. You most likely won't be done at that point. Once the engine can be cranked you'll need to figure out why it wont run. Keep in mind that every time you crank it the battery will be depleted. Continual cranking will drain the battery back down. Try to make the best of each crank…

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Mihail Technician
Maryland
Mihail
 

The electric motor which is ran by the Hybrid battery is the starter motor. I had that same situation you are in with a Sonata a couple of years ago. Did some reading and learned that when the hybrid battery charge drops below certain level the computer prevents the motor from cranking so the driver can’t start the car with the push button. However, that can be circumvented with the use of a…

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James Technician
New York
James
 

ok thanks for the information will try.. … llc

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Dale Owner/Technician
Kansas
Dale
 

That code means the engine failed to start when commanded. On some vehicles, once that code is set the computer will not retry to start the engine until the code is cleared. All the usual suspects apply, but this system uses a combined starter/generator, so pay attention to the drive belt & tensioners.

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Eddy Business Development Manager
California
Eddy
 

Be sure to try the “Library Request” next time. This is what they returned back to me. It's not much, but it does help.

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Helpful
Thanks
Saifullah Diagnostician
Ontario
Saifullah
 

Hyundai service info is complete garbage. Better off just throwing some parts at it than to read hyundai service info. Just my opinion. But I personally appreciate your input.

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Unprofessional
Eddy Business Development Manager
California
Eddy
 

I'll take the service info every day of the week. The Hyundai service info is pretty bad though. It gets better on newer vehicles at least

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Saifullah Diagnostician
Ontario
Saifullah
 

Everyone has their own cup of tea. No issue with that.

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Rassiel Technician
Florida
Rassiel
 

Our service info in pretty good, there is always some korenglish in there of course, you can even find known good waveforms in our service info.

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Disagree
Thanks
Saifullah Diagnostician
Ontario
Saifullah
 

Yes, ofcourse. “Replace with known good” I love that step. Very constructive advice.

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Fred Business Development Manager
California
Fred
 

That step works great-when you have a dealer parts department stocked with test modules, motors, relays and switches.

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Funny
Saifullah Diagnostician
Ontario
Saifullah
 

I was being sarcastic. Swapnostics is not my thing. Might be yours.

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Inappropriate
James Technician
New York
James
 

Thanks will look at the computer systems area testing.

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Timothy Owner/Technician
Wisconsin
Timothy
 

You're going to have to find a way to charge the high voltage battery, before going any further. Take the belt off, and make sure the engine can be turned…

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