Hyundai Sonata Hybrid P1B77 Power Relay Assembly

This video describes how to test the Power Relay Assembly before replacing it as it costs $607 from dealer.
This document describes how to diagnose P1B77
f01.justanswer...

[@ozzymaher2115]

Thank you so much. I went to the dealer and I got the fuse for $37 and I put it in and the card start right away. Thank you again. God bless you.

[@randysmith5332]

Unfortunately I only found your video after I had the issue and after I took my 2015 KIA Hybrid to the dealer. They sent me home, on a hook, lighter in pocket by $980.00 with their "best guess" being a Power Really which was backordered across North America without a delivery date. After reviewing your video and picking up a good multimeter, 6 weeks later I decided to order the Fuse. Kia couldn't get one, Hyundai dealer couldn't get one. I researched and found that Toyota, KIA, Hyundai all use the same fuse. My local Toyota dealer were happy to help - ordered from California, arrived, installed and bingo the problem is solved. Very much appreciate your video!!

[@ghenkhoash2440]

Hi Randy, Can I ask how much they charged you for the fuse?

[@csleeut]

Do you have the Toyota part #?

[@randysmith5332]

@@ghenkhoash2440 153.45 CAD taxes included

[@samspade8830]

​@@csleeut I switched out my hybrid battery fuse but I'm still having "Hybrid Battery Warning" error. Could it be the 12 volts battery too?

[@csleeut]

@@samspade8830 you should check the relay module too as I did in the video.

[@johnbabu3640]

Seems to be a common problem. Power surge is the reason for fuse blow out. The relay may be fine in testing on bench but back EMF (should be protected by diode) in faulty relay can blow the fuse. If you open the relay, there should be a diode). Relay can be repaired, and Fuse should be kept as spare in the car.

[@csleeut]

There is nothing but 4 relays and wires and a connector. No diode.

[@sleepinggiantrt]

Had exact same problem and time frame between repairs. Only difference is that they made me replace the 12v battery both times. I asked why battery failed 3 years both times he said that’s how long they last usually and the 12v battery shouldn’t affect the hybrid system. It was out of warranty this time but they covered all parts except the battery since I got all over their case about it and opened case with Hyundai customer service.

[@johndooley8837]

I have done a lot of work with many types of relays, the inductive kick from one of those small relay coils will not blow a 120 amp fuse, it's not possible. Yes diodes are used across relay coils for that purpose but I have never seen a massive 120 amp diode used

[@MKokoy]

thank you for video, I have 2013 Sonata Hybrid, has that issue, where is power assembly located in the car?

[@yousukkar6497]

Thank you very much for the explanation of this video I have the same problem and I will fix it 2morow god bless the honest people.🙂

[@HOVHANNESFLUGER]

Thank you for sharing

[@SoulBrights]

I don't completely understand this video it's kind of confusing🤔 to me. I don't how to test mine if it's good or bad.

[@jaymondkreek854]

Got the safety switch out , but how the heck do you open it up to check the fuse

[@csleeut]

You kinda have to release two catches on the side to open the cover.

[@zorro7798]

I change it and did not work. I’m still have the lights on and that freaking noise🤦🏻‍♂️🤦🏻‍♂️

[@stephenmartin3533]

Both of these part tested good , any idea what to do next? Video was very helpful. Thank you

[@rccorcoles7082]

I'm im the same boat ..have u figured it out ?

[@HoodRichSWERVE]

@@rccorcoles7082any luck?

[@boujeeyrn]

Any luck on this issue?

[@NA-wq2ty]

Is it a Hyundai 2013 ? I just bought one with 119km and I'm afraid it wont last me 3 years!

[@csleeut]

Yes it is 2013 hybrid.

[@ghalebelfaouri6182]

What is good safety plug assembly reading?

[@JamshedSani]

Can I take out this orange plug after disconnecting the small car battery?

[@csleeut]

I think so, The orange plug is the fuse that connects the hybrid battery to this relay.

[@chuckbehm]

Yes you can, its the safety fuse you can also test it the same way.

[@akoj3262]

Be careful when u deal with battery. Keep yrself ‘insulated’...

[@stilluglyafter2a.m.159]

The plug can be disconnected after removing the 12V battery. It is recommended to remove the safety plug first just incase there is excessive voltage left in the hybrid battery. This is because the DC-DC converter is what charges the 12V battery due to no alternator. Always remove the safety plug first and wait about 10 minute before doing any work. The 12V is a safe system, but you would not want to find out a rodent has exposed wires from chewing on them.

[@rzellmer219]

.Where is that fuse located in the car?

[@tbl8560]

Revised fuse is 150A. Order part # 375F2-4R150.

[@Димон-н7ю]

У меня p1a77 ошибка. Что делать ?

[@ozzymaher2115]

I got ripped off from them already $1600

[@bobkornbrust7138]

The fuse blew for a reason.I am a Kia tech.do you know why it blew? 🤣i bet not.that's why it comes to us.

[@richardsypert5993]

Well Bob since you are a tech for them would you be kind enough to please explain why the fuse would blow? I just bought a 13 Hyundai sonata hybrid that has similar issues i believe and its at least 65 miles to the nearest kia or Hyundai dealership. I already replaced the fuse in the safety switch and the car starts now but still has the dreaded warning. And my scanner won't read the codes for the hev system

[@PivotGrowth]

@@richardsypert5993 he doesn't know shit or else he wouldn't of ended up on this video. LOL

[@joannehenriksson9401]

Well kia tech I had the same problem and Kia could not answer why it blew either or my power relay or justify trying to charge me $1995.00!!! That's why you don't go to the dealer period!!! All they care about is their commission by marking up the parts.