After Gasket repair, got "Check Hybrid System..." error

... and not the car won't even start.

I've replaced the Gasket, Water Pump, PCV valve, and I cleaned the EGR. I followed the gasket masters video. I've checked, double checked, triple checked, quadrupled checked ALL of the connections. Nothing is loose, nothing is not connected.

I went to start her up this morning after getting the the cowl back on and that's when I saw the error. I know there is a faint buzz sound in the back. I don't know if that's due to the 12v battery being low or the hybrid system going out. I checked the fuel and I have ample fuel in the car. I unplugged the battery, the orange pin in the back, and disconnected the large wire with the white clip for 10 or so minutes, plugged things back in, and the same error persists.

Using my OBII scanner, I see a cylinder misfire, but the engine didn't turn over so this may be a false positive. Looking at the error, I went and used the old coils. Still the hybrid error, then used the old spark plugs, just to check if the engine will turn over, still the same thing so I've ruled out the spark plugs and coils despite what the obii scanner said.

I checked the fuse box, there are no burnt fuses.

So either this is the inverter that's the problem, the hybrid battery that's the problem, or the 12v battery that's the problem. I don't have a batter tester so I guess the only thing I can do is see if my neighbor can jump the car. If it turns over then I guess the 12v batter is the problem.

Could any of you recommend anything else to try? I ordered a bluetooth obd scanner so I can use the dr prius app to see if the hybrid batter is faulty, but I think I need the car engine to turn over and run for me to test that.

All that work for the head gasket and now this thing lol.

At a loss.

 

I ordered an NEXAS NexLINK Bluetooth OBD2 scanner. I saw that one was compatible with the dr prius app, which I saw on a search while researching this fault. Should I just cancel that order and order the Autel? And yeah I'm just doing some "basic" troubleshooting. Until I get a tool that can tell me what's going on, I'm just guessing which isn't wise to do. Kinda in panic mode atm as this is my only vehicle and I need a car.

 

I'm sure I've pushed the safety plug into the hybrid battery all the way in. But I can check again

 

Yup just checked a few minutes ago.

That I did. I at least know that's not the issue.

Update: Had neighbor use his van to jump the prius. The prius still didn't enter Ready mode and the Check Hybrid System warning is still displaying with no engine turnover. This is def pointing strongly towards the hybrid-side issues. BUT still need a good obdii tool to arrive to confirm this. To really be sure about the 12v battery, might just replace it with a good one from Autozone. Will need to uber there and back but hey, gotta do what I gotta do.

In the intrim, I could check the inverter HV input voltage too insure that the inverter is getting power. Gotta rule everything I can out.

Might also invest in a mini vci and techstream software.

 

That's just it though. It starts just fine without the jump but the engine doesn't turn over and the car doesn't enter the ready state. It turns on, I see the warning error. The ac works so there's that. lol

 

This was the exact vid I followed while replacing the head gasket.

The job in total for me took about 8 hours. Only because I went really slow, double checked everything before I did anything to ensure I was going it right. Labeling everything, etc...


I unplugged all of the sensors on the coils, disconnected the egr, disconnected the oil pressure, crank position, and o2 sensors, as well as the water pump, knock sensor, throttle body, and ac compressor.

I put in fresh engine coolant and topped off the oil. The coolant is no longer draining. Again, the AC works. I honestly don't think the head gasket replacement is a contributing factor to this issue but what I'm seeing may be an entirely new issue.

 

See above for which cables were unplugged. I had all of the cables draped over the right side after they were all removed. Everything was done in my garage and nothing got wet.

 

Right. Well I'm just waiting for the scanner to arrive. Still I'm going through and checking other options and eliminating those i.e. cables not properly seated or disconnected, 12v battery having a charge, fuses aren't blown. It's not so much guessing but just systematically narrowing down the fault.