Prius (2004-09) :: Intermittent CEL - Codes P1116 And P1121
Apr 4, 2015
The P1116 and P1121 codes have shown up on my 2009 Gen II Prius about a month ago. The CEL is intermittent - it will disappear on its own within a few drive cycles to a week, only to come back again. I'm not sure what to do next - should I go ahead and replace the three-way coolant valve or water pump or both?
Of note I also hear a "push-pull" noise from the engine compartment. Sometimes it persists through an entire drive (my trips are usually short, under 30 minutes) or sometimes it will only happen upon a cold start then stop after a few minutes of driving. What the noise indicates? It sure sounds like some sort of valve or piston opening and closing. It's faint so I've "enhanced" it to make it louder.
Apparently I can't upload .wav's here, so I placed it on dropbox. And since I only have one post, I can't directly link to it. So I will post three replies in order to paste in the link.
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Just last week I bought a 2007 prius from a local dealership in Houston. The check engine light recently turned on and had it checked out by an auto parts store. The codes they read were the p1116 and p1121 (issues with the coolant valve). I know it would cost much to replace the valve, and I am not wanting to pay that much, especially since i just bought the car. I'd also be willing to fix it myself if i had some guide or step by step instructions...
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I've got our beloved 2005 Prius giving us the dreaded CEL with these two codes: p1116 and p1121.
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So I drive a 2008 and a couple months ago I started getting the Check Engine Light. Codes P1121 & P1116. Found out it was most likely related to a faulty Coolant Control Valve or Electric Water Pump. Since the pump was just recently changed I went ahead and got the valve changed.
The light is still coming and going but now when I go on the expressway that red triangle with the exclamation pops on with a little beep. Only pops on for a couple seconds and keeps coming back until I drive a bit slower.
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My son drives our old 2005 Prius with over 300000 miles on it. He had a front end accident a few years ago, and, after body repair and a straightened frame, the car has been running pretty well, although the mpgs have been in the low 30s. This may be the result of his "lead foot." He recently saw the check engine light and the car shows the codes P2601 and P1116.
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So I received the P1121 and took it to the dealer. They told me I also had a P3000. I called another dealer and they said the P3000 could be caused by the P1121 not giving it enough coolant. So I brought it back to the house, bought the valve listed in the forums, and I spent all day changing that + the coolant. I drained the coolant and between the reservoir and the radiator cap itself I refilled about 4 QT, and I saw that my inverter coolant was just below the low line, so I filled it up to the full line. Afterwards, I tried to get the coolant to flow, and it seems like I won't flow. The check engine light immediately came back on and the car said, "Problem." So I immediately shut it off and let it set for a few days. How do I get it so that the coolant starts flowing again. I haven't seen any of the levels move whatsoever on the radiator.
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Wife has a 2013 V and I bought a 2007 with 200000k on the clock. Got a good deal on the car and knew I would have some issues so here is what I am battling. CEL came on and throwing code P1116. We all know the generic code saying engine coolant temp sensor, cooling sensor clogged, etc. this is the only code on the reader. I checked the coolant level and everything is within standards. No leaks appear from the lines. I believe the carfax shows a fender bender so maybe the CHS tank sensor didn't get replaced? So, I guess what I am asking is:
Should I buy a MINi VCI to locate the problem (I plan on getting one eventually just wanted to save money isolating the problem now)? ECU problem? I have read previous post with bad ECUs throwing P1116 but these post were 2+ years. Sometimes it sounds like there might be gurgling from the dash...I say sometimes lightly because it is very faint but have also read older post stating air could throw the p1116 code so maybe a coolant flush?
Also, big question: is the engine coolant temp sensor identical to the CHS tank sensor? The local parts store couldn't find a CHS tank sensor part number just the engine so didn't know if they were the same.
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My check engine light came on with a p1116 on my 2008 with 138k. I replaced the sensor, but the p1116 came back. How to fix. I'm going to replace the coolant today, I read somewhere there might be a clog.
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I took my car in for an oil change and the mechanic said I needed to have my water valve replaced. Based on everything I've read, this is too much. I said I'd have it done later as I had no real symptoms. Well, today I'm on the road and I get the check engine light to come on, pull into an AutoZone and the reading is a P1121 code. No other codes.
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Two weeks ago my CEL came on and the code was P1121. I checked the coolant level and everything seemed fine, so I figured I'd take it in soon.
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I have a 2004 toyota Prius with 185k miles on it and recently got the CEL for P1121. I checked both coolants and turns out that the engine coolant was completely out. I immediately filled it up and the CEL went off for a couple days. It has come back and is on constantly, I checked the coolant and the coolant is at the correct level.
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2005 Prius, 105K miles when the check engine light came on.
Scanner report: P1121 accelerator pedal position sensor range/performance problem.
Fix: Coolant flow control valve. (Even though it was still working)
Part number: 16670-21010
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I took my 2009 Prius in to have the check engine light read and they came up with P1121 and recommended I have the coolant flow control valve replaced. I bought my prius used and noted that in the service history, the valve was replaced under warranty in Feb. of 2013, about 40,000 miles ago. I'm going to have the valve replaced, the prius and I are embarking on a 1500 mile journey in a week or so and I'd rather not take the risk of not replacing it.
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What is the to cause to check engine light go off. I will take my car to auto zone tomorrow morning to hopefully get a code and see if I can fix it myself... if not, then I am going to have to go to the dealership.
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The narrative: The check engine light came on and the DTC reads P1121, which indicated trouble with the coolant control valve. I cleared the code several times and it reappeared. It has been >100F every day here in OK. Investigating under the hood I noticed the engine coolant overflow tank was empty. Opening the radiator cap showed no visible coolant in the tube! OK, I have not seen any leaks and the car has had dealer service 3K ago. I filled the radiator and overflow w/ SLLC (Toyota pink). The DTC has not reappeared and it has been about a week.
My comments/questions: The car is getting old and I can accept a little maintenance. 2004 Prius @96k...
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I have a 2006 prius whose check engine light just came on 1 hour ago. I had it diagnosed and it is giving me the p1121 code, or the coolant flow control valve. I checked the coolant level and it was very low. I added fluid, but the CEL is still on. I have to make an 11 hour trip tomorrow.
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I've got my "P1121" fix (replaced coolant control valve) recently and after about a week or so of driving (about 500 miles) I started to hear a gurgling sound at start up and sometimes when I turn the car off. I also noticed that pretty good amount of coolant (front side) was lost over the that same period of time (it wasn't losing coolant before for good 2k+ miles). I instantly filled the coolant and started the car. No gurgling then. But the gurgling came back after about 3 hours when I started it again. Car is not giving me any codes though.
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About once a week my check engine light comes on. The code is P1121, which is about coolant valve sticking. In about one or one and a half days it times out and i dont get the warning light for another week or so. Do you think I should have something done right away or wait and see what happens?
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On my 05 Prius (65K miles) I recently had my local Toyota dealer replace both the inverter water pump (for free per recall) and main engine water pump (~$500 based on their recommendation because of some coolant leakage). 1 week later, I got the P1121 code coming off and on intermittently.
My dealer says that the work they did is not related to P1121.
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i have a 2005 Toyota Prius that the air conditioner wont work in. it has Freon in it the compressor wont kick so I did some research and my cooling fans aren't kicking on so I did a by pass test and the cooling fans motor is good they just wont kick on. I just replaced my 2 cooling fan relays and they still wont kick on. the check engine light was on in the car when I got it. it throws the code P1121 coolant valve control. I got the part just got to get it put on. Could this part stop my cooling fans from kicking on or my ac compressor from coming on.
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Code says P1121 Accelerator Pedal Position Sensor Range/Performance Problem. I heard that was wrong and its really coolant control valve? The battery drains fast and the can runs like crap. Would this code be doing that to the car?
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