Prius (Gen 2) :: Code P0505 - MPG Dropped To 31
Aug 11, 2013
The engine light went on and I took it to my mechanics who is good on everything except Hybrid system.
Immediate after the lights on, I filled gas and the mpg dropped to 31, soon back to 37 on a hot day 85 degree. At red light, I feel the engine still running, not very smoothly. But the next day, it back to normal, mpg also back to 48 something.
My friend has a 2005 with 140K also got the same code. His mpg dropped to 40 and feel that engine power is lower now.
I would like to know if this is a common problem, what's the most probable cause, and if there are many possibilities, what's the best way to approach.
Here is problem area by OBD-II:
Engine and ECT
Hybrid Control
ABS/VSC/TRC
Air Conditioner
Immobiliser
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I recently borrowed an engine code scanner after my check engine light went on and got a P0505 code on my 2004 Prius with 185,000 miles and started to fix things. I replaced the PCV and spark plugs as well as the air filter. It ran fine, but decided to also clean the MAF using CRC MAF cleaner and also clean the throttle body and butterfly using CRC Throttle Body cleaner. I also carefully washed out the engine compartment using Gunk Foamy.
I seem to have put it all back together, but now the ICE won't shut down, even when warm, and actually wants to rev beyond what seems to be needed. I got another scanner and got some stuff that I honestly don't understand. It said 2 codes then gave me P0505 followed by:
Mil On
Monitor 0 inc
6 ready
misfire
fuel
comp
catalyst
evap
O2 sensor
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I made three ten mile trips this evening. On the first trip the "engine" light came on. This is the first time I have seen this light (2004 @ 134,000 miles). ScanGauge reports diagnostic code P0505. The "engine" light remained on through all three trips. Also, I was not able to get the ICE to shut down and run only on battery at all, even though the battery was on the upper level of charge and the engine was warm. There were long stretches where I normally run on battery at around 35 mph. I'm supposing there is a connection.
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I was driving home the other day and my CEL came on... I checked the gas cap and waited a few days to see if it cleared. When it didn't clear I had the codes read and it came back with 3 instances of P0505.
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I had our '04, 149,000 miles in for PA state inspection and emissions test as well as to be looked at because of a P0505 diagnostic code. The symptom of the diagnostic code was that the ICE would not shut at all. The past few months I simply cleared the code (ScanGauge) and things were immediately back to normal until the check engine light came on again.
Anyway, in response to the P0505 today they replaced the air filter (I checked, it is installed correctly), checked for vacuum leaks (all okay) and cleaned the throttle body. My wife picked up the car this afternoon from the repair shop (independent, but mechanic trained by Toyota for Prius). Upon arriving home she said I needed to drive it because it is acting very strange. We drove it this evening and indeed it is acting strange. A number of times the engine revved up to 2800-3000 rpm when my foot was off the gas, e.g. slowing to go around a corner or even when sitting at a traffic light. The SOC was normal (blue bars), not high or low. It was also interesting, because even though the transmission was in D, the car was not pulling to go forward, e.g. at the traffic light-- in D, engine revving, but car just sitting there as though it was idling or ICE off.
The ICE would shut down and go to battery mode appropriately. However I noticed that the mpg would not go about about 110 when backing off the gas going down a long hill at around 50 mph (engine warm, battery normal charge). Normally this would bump it up to around 200.
This latter symptom of mpg not going about 110 is a bit subjective and we only drove around 20 miles this evening, but I know we did not experience the engine revving before the car being serviced today.
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I have a 2004 Prius with 196k on it. Over the past 3 months, I have had the P0505 CEL come on about 3 times. After looking over everything and not noticing it running differently, I have cleared the code and kept going. The CEL stays off for a 3-4 weeks, then comes back on.
Yesterday, the light came on and was accompanied by a rougher idle. I checked the code and the only one shown is P0505 reads as Idle Air Control System. I removed the airbox and cleaned the MAF sensor with MAF spray and cleaned the throttle body valve with throttle body cleaner spray. They were both dirty, but didn't seem too bad.
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I have a 2005 Prius with almost 244,000 mile and about a week and a half ago the check engine light came on. I went to an Advanced Auto and had them read the code for me, which came back with a P0505 error code. I have read several things on web that this code is a Idle Air Controller related.
I also have read that this could be to a loose or bad PCV valve, an air leak in the vacuum lines, throttle motor shaft might be binding, or a failed engine ECM.
The car runs and idle just fine, no stalling or a rough idling. The only problem that is obvious is that when the car is warm and I come to a stop or put in park, the motor will not shut off.
Which one of these would cause this to happen? Or could this be due to a MAF sensor that needs cleaned or replaced?
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My check engine light has come on twice now and I'm getting a p0505 code, idle air control malfunction. It seems as though there could be a couple causes for this. All my hoses seem tight, so the cheap fix seems out of the question. What could the other causes be, and more importantly, about how much for a shop to fix it. I have a 2006 with 155,000 miles on it.
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Few weeks ago.....Prius was showing the P0505 code .... Mechanic, ran diagnostics and determined it was dirty TB. Cleaned TB.....cleared the code (inspected PCV...hoses).
When I initially picked it up it was revving very high....so he hooked it back up to the scanner and did some type of "reset" for the idle (this cleared most some computer settings...back-up beep, radio stations, etc...). Everything ran fine for past 3 weeks...
Just last night..... started running rough again. What I noticed this morning ... Started it up and it ran very rough til the auto shutdown after warmup (no warning lights). Then....when I started driving slowly out of the lot...it ran "rough upon acceleration"...... Then fine at cruising speed. Same behavior at every light....rough acceleration.... fine once up to speed. Just started it up again and same behavior.....(does not die...just very rough).
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Trouble Code 0505: Vehicle speed idle speed control auxiliary inputs
What would be the auxiliary inputs?
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My 2004 Rubicon has been having some idling issues. It idles kind of rough (+- 200 RPM) and is hard to start. I tried to start it recently and after 4 cranks, it started then the CEL came on, and has been on ever since. I have recently moved from Washington state to Houston Texas, and the problem starterd here in Texas. I checked the code and am getting a P0505 code. I had a mechanic replace the IAC valve, Checked for vacuum leaks, and cleaned the throttle body. The mechanic says the output from the main computer appears to have burned out, and needs to replace the main computer(for $1000). The mechanic can clear the CEL, but after turning the jeep off then back on it reappears. The mechanic says he verified the computer was the problem by installing a known good computer and it cleared the problem. Does this sound right to you? If my computer is bad, wouldn't my whole operation be affected?
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I just bought 05 prius from a dealer I don't know the history was told all it needed was a hybrid battery.
Now I have a 05 that I drive with known good parts so I pulled my hybrid battery and installed it in the new car the monitor showed engine charging inverter then going to the battery. However the bars on the battery graph start dropping. only code is a engine code 2102.
I also noticed the old A/C condenser in the back.
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On my battery poles I measure like 12.8v, my scangauge reports around 12.4v/. I have an additional voltmeter connected to the cigarette lighter cables & same thing there: 12.4v. The voltage go down soooo much. My first thought was that my battery is not getting fully charged, but after measuring directly at the poles, it's obvious that the voltage drop happens on the way.
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My 2007 Prius has about 105,000 miles on it. For awhile I was getting around 41-42 MPG which I thought was a bit on the low side, but the dealership never found any problems. I had the recommended 60k service done then after that stopped going to dealer for routine maintenance like oil changes and such. Lately though, my MPG has dropped to around 37. I use Chevron gas all of the time and I keep up with my oil changes. I try to also make sure my tires are inflated properly.
They had a special on oil changes at the dealer so I asked them what they thought might account for the drop in mileage. Their initial thought was cleaning out the fuel injectors. I do change my own air and cabin air filters.
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2011 Prius for wife. Mileage has always been upper 40s to low 50s until the last week or so, now she is seeing 35 mpg displayed.
I have asked for a check at fill up. I just pulled the car out to wash it and noticed the engine came on right away, same when I put it back into the garage. In the past we would get part way down the driveway before the engine came on. Also did a code check and no codes found
What are the approximate outside air temps? 40s am 70s pm.
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Well I shouldn't say MPG since we canadians use L/100km.
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My Father In Law bought a 2012 Prius C last year in Houston, they are from El Paso. The car drove great for many months, he takes the same path to work and same speed every day and was consistently getting over 60 mpg. All of a sudden winter came and he lost MPG and the engine would come on more often, even while parked. I own a 2009 Prius and told him mine did that too during the winter, because for some reason, during winter the battery drains while parked and the engine comes on to charge.
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We recently got back from a 2800 mile trip. Our v now has 10,600 miles on it. We have been averaging 41 mpg until the last two tank fuls. For some strange reason we got 34.5 displayed on our last tank, 32 actual, and right now after 90 miles we are showing 30.5 displayed. My wife drives the car 98% of the time, but even when I use hypermiling techniques the car is not yielding the past displayed results. We are about to take it in for the 10,000 oil change.
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I've had my car going at 45 mpg the past 2 years. I just hit my 45k mileage mark. I drive mostly on the highway to work so getting 45 mpg is pretty good for me. This last few fill ups, I noticed my gas mileage has gone down to 40 mpg. I thought it was a mistake if it was just once but the last 7 fill ups has been that way. It just went down all of a sudden and has stayed that way.
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so I recently had my 2012 Prius in for oil, tires and alignment. I was getting 55mpg all day and now I can't keep over 45mpg. Tire press is 38 all around with Goodyear assurance. Could the alignment be off causing higher rolling resistance. Maybe wrong oil.
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I have Prius 2010 and I was getting 20 km/l to 22 km/l until I repaired the part which is between two tires and when you revolve your steering it revolve due to that rod. Right after I drive my car as I came out of workshop, it seems that my engine keep running more and turn off less.
1- Can I check if my Hybrid battery is getting weak or what is the health of my hybrid battery ?
2- Is there any way if I can check my front tires are revolving without any friction and revolving freely ?
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