Prius (2004-09) :: Code C1365 For ABS / Braking System


Jan 7, 2016

Its a 2009 with about 75K miles. Back last year my wife drove through some thick mud, and this caused brake failure....yellow exclamation mark, VSC, and red brake warn lights all on and the buzzer sounding. I did not have mini VCI/ techstream at the time, but I went to car wash and sprayed out the insides of wheels heavily, and then did the jumper trick while pumping brakes 8 times, and the faults cleared and brakes worked perfectly for some months--- until this weekend. We had very heavy rain again, and the tires were encased heavily in mud again. I figured it must be a wheel speed sensor signal problem again. So I took it to car wash to clean inside of wheels.

Now I have the mini-VCI /techstream running on a laptop to check it out. I ran the health check and it came back with code C1365 for the ABS/ braking system. I cleared all DTCs, and the fault lights cleared, but the brakes soon failed again with the same dash indications. Tried once more, same thing. Then I remembered about the trick last year of jumpering the diagnostic connector. This temporarily clears the fault, letting the brakes work fine, until the next time you start the car. Then it comes back. I clicked on that fault code in techstream, and noted that code C1365 was telling me that the accumulator press. sensor voltage was below threshold. Should been at least 4.7 volts, but it was at 4.37.

But the brakes work perfect as long as you don't shut it down! So how can a part really be bad? If it is indeed bad as the code says, is this sensor replaceable by itself, or does the whole accumulator have to be replaced? Is it a job a DIY mechanic can do? I am able to at least drive the car, although my wife can't. I just stick two pins in the diagnostic connector, and I connect them temporarily with a jumper to do the reset trick before each drive.

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Prius (Gen 2) :: Red Master Warning And Yellow Braking System Lights - Code P0A08

My 2006 prius has the Master warning light(red) and the braking system light (Yellow) on while I am driving, and I went to the dealer.

The technician told me that he could not verify any warning lights ON at that moment, and he performed health and diagnostic checks on it. He inspected connection at auxiliary battery and junction box 1. All checked OK at this time. No repairs recommended at this time.

However, the master warning light came on when I pick up the vehicle. The dealer told me that they will inspect it again tomorrow. And they found that there a P0A08 error code. They suggested me to replace the hybrid converter/inverter.. My car can still drive while the lights ON.

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Prius (Gen 2) :: 2004 - Error Code C1310 / Malfunction In HV System

I have a 2004 Prius with 80k miles. Always has been a workhorse. Recently had a bad cell in the HV battery. Battery rebuilt with new cell and now works great.

Now it runs about 20 miles and then displays dash lights of red triangle and small exclamation (brake?) and VSC.
I took it to Advance Auto and their scanner reads C1310 'Malfunction in HV system'.

I actually replaced the entire HV battery again with the battery from my friend's car, and the 12V battery too, but no luck. Same error.

If i disconnect the 12v battery for a while, it will clear the code and the car runs fine for about 20 miles and then dash lights come on again.

Car runs perfectly, over 50mpg even with the dash lit up. What that code is?

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Prius (2004-09) :: Code P0A93 - Inverter Cooling System Performance

I have a 2007 Prius, and bought it used about 4 months ago. I have not had any issues with it until last night. Last night I was driving home and the red triangle with the “ ! “ in the middle and check engine light came on. The car seems to be running fine, but it scared me to see the lights come on...so this morning I called my local Toyota dealership.

NOTE: I recently went to them for an oil change and they informed me that I had three recalls on my vehicle that needed replacing, but I did not get them replaced because I was told it would take 5-6 hrs (which I didn’t have at the time).

Anyway, they told me that it would cost $70 to have the codes read...and that did not include parts that may need replaced... I thought that sounded a little high for just having the codes read so I went to my local Autozone and they gave me this code:

P0A93 - Inverter Cooling System Performance

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I pulled over and had the dealership come tow it to their shop and I left it there for a day. They called me to come get it, so I picked it up, and they never charged me anything so I assumed it was all under warranty or something. Now almost 7 months later I am having the same exact problem. I called the dealership to see what they did to fix it last time and they said there was no record that anything had been done to it, that they think it just started up fine with no problems when they tried.

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Prius C :: Code Check Hybrid System Came On

2013 Prius C THREE 67k miles

Got out of my car after using it friday. hopped back in to go to work tuesday was getting," Check Hybrid System, stop and pull over immediately". I put about 30k miles a year on my car so i run it hard and I am probably due for oil change and tranny fluid drain and fill but other than that because the car was working fine friday. I tried going into accessory mode then holding brakes and powering up, I forget what that's called, but no luck

Towed it to my mechanic, he said that he was getting generator errors (and tsp or tsb things?) and that he could most likely do the work but that I should make the dealer do it because it may be under warranty and didn't charge anything. So got it towed to the dealer and after the hybrid tech got in they said they see some generator error but they can't reset it. But also mentioned they got the car to come on.

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Ford - Taurus :: 2004 - Emission System Light Came On / Code P0456

So my car's emission systems light came on last Saturday and after work today I took it to the local Auto Zone to have an onboard diagnostic done to see what the code was, as some friends had recommended. I have a 2004 Ford Taurus with about 146,000 miles on it. It came back as only one code, P0456, which according to the clerk meant one of four things.

1.) Defective, loose, or missing fuel cap
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3.) Purge or vent solenoid defective
4.) Vacuum leak at engine

I asked him if there was anyway to eliminate a few of these, but he wasn't sure and said I would have to take it to a dealer or a repair shop (which I expected). I was wondering any tips or tricks so I can eliminate a couple of these, and also if this is a five alarm fire I should be panicking about. I did call my Dad and he did not seem overly concerned about it. Plus my car is still running fine and the light has remained steady and not flashing. My friend at work suggested I put a piece of black electrical tape over it and ignore it, but I want to be sure it passes inspection in September.

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Prius (2010-12) :: Check Hybrid System Came On - Code P0A94 And P324E

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Prius (2004-09) :: 2007 Shakes When Braking Below 7 Mph

My '07 shakes when braking below 7 mph. Coming to a complete stop is never perfectly smooth unless medium to hard braking is required. My thought was that the MG2 is in creep mode even while my foot is lightly on the brake pedal, causing the jerking, but creep works properly while not braking.

The shaking is very steady, at about 6 Hz, the same frequency as the "popping" noise one hears when stopped at the light with the foot lightly on the brake; just enough to keep the car from creeping, but not mashed far enough to turn off the creep current from the battery. I take it there's two sensors on the pedal as well as a potentiometer. Could the problem be mitigated if the creep current were cut off at the presence of a foot rather than having to press harder? There is no shaking on a harder stop, only the slow ones.

Another thought I had was that the pressure pump itself is supplying the brake pressure to the friction pads, causing the pulsing. In a previous thread, we discussed why my pump was coming on so often. Perhaps a leak in the canister causing the pressure not to be buffered, and the pump itself providing the pressure.

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Prius (2004-09) :: LCD Display Goes Out After Sudden Braking

(2007 model)

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So now we're at the third time. Same thing, sudden braking, ACC-B fuse blew. Replaced it, started up the car, blew again. Replaced it, started up the car, blew again. so now I'm at 3 25A fuses that have blown in the past 2 hours, 2 of them within 60 seconds of the car turning on.

One thing I did think was kind of interesting is when I turned the car on, I could hear various noises which sounded like electrical components doing a startup sequence, then it blows. The only thing I have in that front area is a tiny 12V camera, nothing else plugged in at all.

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Prius (2004-09) :: How Does Regenerative Braking Work

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I have always noticed a noise/vibration coming from the passenger side when braking at low speeds. I havent noticed at higher speeds but maybe there is more road noise. The best I can describe the noise is that is sounds like a compressor running. I have a hunch it's the AC compressor and might be related to the regenerative braking, but I am no expert.

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Prius (2010-12) :: Disabled - P0A94 Code And Check Hybrid System Message

My new-to-me (bought in May this year) 2010 Prius last night suffered. Nearing home on my usual 21-mi commute from work and on a secondary road, I was stopped at a red light. As I normally do when at a red light when a rather spirited start isn't needed (no or few cars behind me, not uphill, etc) I pushed the "EV" button to take advantage of electric acceleration up to 25 mph. All seemed normal as the light turned green and I started off. I don't know if I reached 25 or not - must've been close - when all of a sudden the acceleration stopped as if I'd taken my foot off the pedal when indeed I'd not. Simultaneously, a circus of lights lit up on the dash along with the fairly ominous message of "Check Hybrid System."

As with all things electronic these days, I figured a good ol' fashioned reboot was in order. Turned it off and back on and...same thing of course. Being near an intersection and a very bad place to be stopped - and not knowing if the car would actually move - I pressed the accelerator anyway, despite the warning lights, and indeed the car started to move. It seemed to cap the speed at 12-13 mph, which immediately seemed like some kind of self-protective safe mode. Luckily, I was within spitting distance from home, so I limped the last 1/4 mile in this state - and at 12 mph.

There are probably 5-6 warning lights on in addition to the big "Check Hybrid System" message. Let's see, first and foremost, the yellow triangle of death, followed by what I think is the Slip indicator (car icon with wavy lines), the CEL, the encircled exclamation point which I think is the braking system, and I forget, a couple of more. I should've snapped a pic but I was in a hurry to troubleshoot.

So I used my Actron scanner to pull the P0A94 code. I didn't see that it's able to read the sub codes, or maybe that's a capability that only the expensive dealer scanners have. Anyway, I can't conclude what it is other than the generic "DC-DC Converter Performance". I know that here and elsewhere there's a list of all DTC codes, and I saw that this code has 17 sub-codes, many of which are related somehow to the inverter, which seems to have been the subject of a recall in Gen II models (acutally the inverter cooling pump IIRC) but not on Gen III.

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