An onslaught of codes

Hi All, I hope I’m in the right place


Having a strange onslaught of codes and issues that I’ve run out of money to continue to professionally diagnose. Here we go:


My 07 with 265k miles has been acting bad, the brakes intermittently acting as if Antilock was engaged even when I am barely touching them, other times, smooth as can be. Also loss of fuel efficiency by 10 miles. I’ve had a p0420 for about 3000 miles.


Then these codes with triangle of doom and a few other lights (NOT ABS):


P3000 - battery control system HV ECU

P3012 - battery block 2 becomes weak

C1259 - anti lock brake HV regenerative fault

C1310 - fault in HV system / ACTV Brake Solenoid

B1400 - something about the AC


NOW, After transmission service, battery fan cleaning service, MAF sensor change, throttle body cleaning, and hybrid battery replacement I’m still experiencing the brake bump to a lesser degree, slightly better fuel efficiency, a bit of a louder engine with rougher idle showing the following codes:


P0420 - catalytic converter

P0403 - EGR circuit malfunction

C0700 - left front solenoid circuit malfunction related to brakes

P0301 - injector 1 misfire

P0300 - random intermittent misfire

U0100 - lost communication


I’d love to solve this done.

Where is the best place to begin, Prius chatters?

 

Jc, it is a task I will have to jump into. I’m going to have to find salvaged parts and do labor myself as far as is possible..I’ve been using midas and Toyota but have had questionable experiences with both.


TMR, you are correct. It had new spark plugs 2 years ago and has had regular maintenance elsewise. I’ve driven it 130k in the last 3 years despite all of its drama. I plan to pass it to kids so I’ll just keep repairing, especially while my battery is under warranty. I just want to start ruling things out. New coil packs and plugs are in the mail. I’m most concerned to: discover what might be draining my batteries, not cause engine damage, and rule out or address the brake mystery which showed codes before AND after fresh hybrid battery.



A bit of history:


Bought in late 2015 at 135k and the hybrid battery fail within 2 months. Couldn’t afford Toyota service, so got a good warranty from Midas. Changed 12v at the same time. 1 month later the ABS fails and Toyota changed it out under a recall. 1 month after that, the hybrid battery fails again (inside warranty), and again (inside warranty) last week. The transmission and maf service and the fan cleaning were required to be ruled out by Midas before honoring warranty on battery. When I walked out, I was being told the the p420 was the only remaining code and that I should fix it before it messes other things up. Since I live in California, I changed the sensors (maybe 6 weeks ago) to see if I could avoid it for a bit.

I was literally driving away from the auto shop when the red triangle and some other lights (still no abs) came on and threw the other codes I mentioned (looked with my own scanner). I ran and grabbed a mechanic and his scan tool and he only pulled the U0100 code. So I’m wondering if the communication fail could be the reason for the other seemingly erratic codes. What do you think?

 

Update:

I’ve been driving the car and have some new patterns to share in hopes this can be diagnosed. Midas and Toyota failed to experience the ‘brake bumping’ that I am experiencing to increasingly worrisome degrees.

I drive a lot, 50k per year. Each day when I start the car in Southern California, the brakes are smooth. After several hours of driving (usually around town) the brakes begin ‘bumping’, ‘grabbing’ and otherwise acting as though I have slammed hard and antilock has been engaged. I’ve been driving very carefully and slowly as I’ve read of a few ‘full failures’ here and dont want that experience. Why might it seem that the warmer my car is, the likelier I am to experience this?
Does anyone think it could be related to the C0700 code? More importantly, am I on my way to full failure? ABS was replaced by Toyota in late 2016.

Additionally,

Reliably, at a certain non-sloping section of the 405, traction control light begins flashing (no brakes applied) and stays doing so for a good solid 3 or 4 minutes. My tires are new and are rotated and serviced once per month. Tire shop has confirmed that my new (albeit cheapest model) tires are the same, right for my car, and properly pressurized.

Help!