U0293 u0100 u0111 u0293 p0a1d

Try to disconnect the 12v battery for a few seconds to reset the car, then drive home.

Sounds like you have a combination meter issue too

 

If disconnecting the 12V battery does not help, the hybrid vehicle ECU may need to be replaced. DTC P0A1D means the hybrid vehicle ECU has a fault while DTC U0293 means that communications was lost with the hybrid vehicle ECU.

 

I recommend you check the 12 volt battery. A weak battery can cause many weird problems.

I have seen Mini VCI cables cause U codes. The standard MIni VCI cables are cheap knock off clones of copies. For the most part they work. On some cars they cause problems. Your U codes started when you hooked up the Mini VCI. And disconnecting the 12 volt battery seemed to clear them.

This is what I now use instead of a Mini VCI cable. It works much better.
With SAE J2534 Vxdiag VCX Nano for Toyota Tis Techstream V10 30 029 Compatible | eBay

Brad

 

The hybrid vehicle ECU is located next to the engine ECU. Both are behind the glove compartment. This is different than the traction battery ECU located in the battery case.

It is not helping to have a high power drain upon the 12V battery. I hope that you are playing that stereo system at high volume only when the Prius is READY.

 

1. Make sure that you do not have anything plugged into the OBD-II port. Disconnect the 12V battery to clear the DTC and wait a few minutes. Reconnect the battery, and see if you have the same problem.
2. If you do, find the HV ECU behind the dashboard. Make sure that you will be able to remove it, which requires disassembly of much of the dashboard, removing the passenger SRS bag within the dashboard top panel, etc.
3. Note the part number of the ECU. When looking for a replacement used unit, look for one with that part number or higher. If lower, it may not be compatible. If much higher, it may not be compatible.

 

@ruidboi , were you able to resolve this issue? My 2007 Prius just experienced pretty-much the same issue with 3 of 4 of the same codes (U0100, P0A1D, U0293).

 

I unplugged and re-plugged 20A HEV fuse and unplugged and re-plugged everything under the cover to the left of the parking brake. It looks like it isn't the first time that cover has been off. When I started it up, the U0100 and P0A1D codes, red triangle, and check engine light had all cleared themselves. The car was still showing U0293, so it was odd the check-engine light wasn't on. I manually cleared that, drove a few blocks back home, and checked again and found no pending or active codes.

I wonder if the problem was a connection wasn't plugged in tight and got shaken loose during bumpy driving. The smallest connection, in the upper left hiding behind wires, seemed like it might have been loose.

 

Did your problem ever return? I am having those same three codes on my 2007.

 

Same here I am simply having the UO293 code. Any word?

 

Has your prius had any issues with water intrusion?


Before replacing ecus it'd be smart to check connectors for corrosion. The whole under dash area. From power supply ecu to gateway to hybrid ecu to immobilizer, etc.

 

Interested in info on this as well I have something along those lines as well. Mine kicked on today (codes U0100, U0111, and U0293) I unhooked that battery and when I put it back on they were gone, drove a few miles and it came back. Also, when the lights come on there's a hissing/static type sound coming from the back passenger area (like where the 12v battery is).

 

The connection between the control units of various systems that use the values of their sensors has been broken

There is a fan for the high-voltage battery in the back. When it gets clogged with dirt and dust, it starts to whistle.
But check just in case, Be careful! A snake hasn't crawled into the trunk.

 

U codes are communication codes, something amiss in the network that connects various ECUs in the car together.

The problems can be solved but require focus, and a knowledge of how the ECUs are interconnected. The information is found in the "Multiplex Communication" and "CAN Communication System" sections in the repair manual. The details are too many to summarize here in any really useful way.

Toyota Service Information and Where To Find It | PriusChat

 

What warning lights are lit up on the dashboard? How does the car operate? What scantool are you using?

Those codes are for ecu's that talk on the CAN bus network. The ECM, hybrid vehicle control, and high voltage battery.

If I was trying to work on this car, I would start with a capable scantool and check all systems for codes to see if it affects anything else. (the Autel AP200 is a good option for a smartphone).

Posted via the PriusChat mobile app.

 

2005 Prius, 340K miles (odometer stopped counting two years ago at 299K). Replaced hybrid battery about 4 years (80K mikes) ago and have had a couple small issues here and there.
Most recent issue: a few miles into a drive I noticed a loss of power, when pressing the accelerator down I noticed a vibration coming from the from end, engine sounded like it was stalling/fluctuating power, and then I got the red triangle along with the following codes: U0293 U0100 U0111 P0A1D. I then had to limp the car home feathering the gas to find traction in the transmission, it really felt like a transmission failure. Once I got home I read this forum and decided to start with the 12v battery disconnect. After clearing the codes and disconnecting the battery for an hour, I reconnected it and the car went back to normal. I then drove it for a couple minutes and the same symptoms came back. At this point I am starting with the HV control replacement, but will also check the 20A HEV fuse. Any input to help me narrow down the issue would be great, as I will be updating this post as my troubleshooting progresses.