DTCs P1116, P1121, P1150, & P1151

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Dojanah, Aug 6, 2016.

  1. Dojanah

    Dojanah Junior Member

    Joined:
    Jun 22, 2014
    4
    0
    0
    Location:
    Jordan
    Vehicle:
    2009 Prius
    Model:
    II
    Hey guys...

    I have a 2009 salvage Prius, been running for two years now with some mild to severe problems all of them I managed to get them fixed.

    I have had these errors come-up respectively, prior to them showing, I noticed the radiator cooling fans running more frequently, tried topping off the coolant in the radiator to make sure, and I'm pretty sure it took more than 2 liters at once.

    Not long later the check engine light went off and those errors showed up by scanning my car with the OBD II device I have.

    Cleared errors to see if the problem would just go, but one day later they showed up again.

    Checked the car for leakage and it turned out that the engine radiator was busted. Had it changed, cleared errors and went home.

    Same codes popped up again, and I checked the coolant temperature and it would reach up to 112 C while driving at high speeds and would be around 100 C in average, but reading some of the troubleshooting threads concerning the about-same-problems indicated:

    I made sure topping the coolant up and burping the circuit, cleared all errors, and tada! Engine coolant in cooling off (around 85 C) and so far no DTCs came up...

    Now,
    Is there anything else I could/should do?
     
  2. andrewclaus

    andrewclaus Active Member

    Joined:
    Sep 15, 2009
    993
    318
    0
    Location:
    Golden, CO
    Vehicle:
    2007 Prius
    You may get P1121 again. If you do, replace the three-way valve at your convenience--it's generally not a critical item. Worst case it'll affect cabin heat. (I let mine go for most of a year.)

    Keep a close eye on coolant level and crankcase oil consumption from now on, every couple of fuel fill-ups or so.

    There's a remote chance of engine head or block damage from overheating. Has your fuel efficiency changed at all?
     
    Dojanah likes this.
  3. Dojanah

    Dojanah Junior Member

    Joined:
    Jun 22, 2014
    4
    0
    0
    Location:
    Jordan
    Vehicle:
    2009 Prius
    Model:
    II
    Thanks for your tips.

    I do check coolant and engine oil regularly, for both they get a little low from time to time but I checked for engine damage caused by overheating and lucky it was all good.

    I get around 40 mpg, it fluctuates a little bit depending on weather, I get this average with AC always on, a 40 mile daily drive with some steep hills to climb....

    Thanks

     
Loading...