I currently have a 2006 prius gen 2 and ot needed some welding on the rear arches So as per the advice i dissabled the traction batery and the 12v battery After the welding was finished i reassembled everything in the correct order When i tried to start the car it wouldn't start pass the inital ignition So after this i has an rac guy plug his laptop in and it threw these error codes System Type: ENGINE SYSTEM TEST/VALUES Name: 1NZ-FXE - HYBRID VEHICLE SYSTEM (HYBRID VEHICLE SYSTEM) - 1.5L - 57 (77) DTC: P0A0D,High voltage system interlock circuit high System Type: BRAKES Name: ANTI-LOCK BRAKING SYSTEM - DIAGNOSE DTC: C1256,Accumulator low pressure malfunction DTC: C1259,HV system Regenerative DTC: C1310,HV system System Type: BRAKES Name: ABS/VSC/TRC - DIAGNOSE DTC: C1256,Accumulator low pressure malfunction DTC: C1259,HV system Regenerative DTC: C1310,HV system System Type: STEERING Name: POWER STEERING - POWER STEERING (EMPS) DTC: U0073,CAN bus off - Transmit Error DTC: U0121,CAN: No communication with ABS/TC DTC: U0073,Control module does not respond DTC: U0121,Communication with TC/ABS System Type: TEMPOMAT Name: CRUISE CONTROL - CRUISE CONTROL (CCS) DTC: P0A0D,High voltage system interlock circuit high System Type: AC SYSTEM Name: CLIMATE CONTROL - AIR CONDITIONING (AIR CONDITION) DTC: B1421,Sun sensor, passenger side DTC: B1442,Air inlet damper control servomotor Any ideas?
Would that indicate the high voltage interlock is not closed properly, triggering all the other DTCs? I know it is a common mistake.
Some of the codes seem a bit weird to all happen at the same time. Almost seems like 12V battery was not disconnected. Best would be to log them and clear them and then recheck which would come back. But first remove and reinstall the hybrid battery interlock switch. And don't forger the third step of pushing it downwards after the leaver is turned. Why did it need welding? Rust? Could you post a picture?
The amount of replys is amazing thank you guys youve solved it The hybrid interlock wasnt pushed down and being a first time prius owner this is my bad oops! After clicking it down the car came to life with 0 faults It needed welding on the rear passenger (uk) sill that has a ding and rotted thru I think more people should be aware of this interlock it would have caused a nasty bill at the dealers I know its bad at the minute but its not finished .... its just the initial weld and just note i am not a welder neither is my farther in law but we try our best and allways pass an mot
Yea, it's one of the most common mistakes... As for your welding skills. I've never learned to weld myself, but... Um...
It is extremely difficult to cut out a rotted area and then make a replacement piece that fits exactly in the opening. Even harder to weld the seam/gap. Looks like the result of an inexpensive 120vac flux core wire feed welder being used by the average guy who is trying to learn. No shame to be had. We've all been there. This is when a good grinder comes in handy!!! Welding sheet metal is much easier when there's a lip to provide some overlap. Good technique is learned in months/years, not hours/days.
I noticed in the OP, every code was listed twice, so it wasn't nearly as huge a list of codes as it appeared. The P0A0D was about the interlock switch, and that's a code logged in the hybrid-control ECU, which naturally means the brake ECU will log C1259 and C1310, because those mean "hey, did you hear the hybrid ECU has a code?" The B1421 is just the not-sunny-out-when-you-read-the-codes code, the U codes are all comm errors and usually come in groups (if A says "hey I can't talk to B", chances are good B will also say "hey I can't talk to A"). Along with the brake pressure and HVAC servo codes, I would guess those got logged because, with the interlock open, the car didn't go READY, and enough time was spent wondering "why won't it go READY" that the aux battery got deeply drained at one point. That's my story, anyway.
That would make sense. Those were the once that I thought couldn't happens because of hybrid interlock. But I just didn't think that it was just let to drain the 12v battery. Again a good a reason to check the freeze frame every time as you would have seen the low voltage there. If it didn't stay in ign-on for a long time when this happened you might just need a new 12v battery soon.
Yea... If I wasn't on Reddit where people post the nicest looking welds you'll ever see in the channel known as r/oddlysatisfying And I bet once I start learning to weld I'll start with something like this. But I'd for sure grind it down so no one realizes I'm still learning. Lol... I guess I'm kinda vain like that...
Yep, I've seen codes flow like that when the plugs weren't fully plugged into the battery ECU... In a way, having lots of codes is actually a sign that the fix isn't' gonna be so hard once it's figure out.
If the door was open during the welding repair, that could have pulled the 12v battery low to begin with. Always best to disconnect that 12v when extended doors-open work is planned.
