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  • P0299 fault code

    We have just spent a week in the Victorian High Country. On Friday we were coming down from the Dogs Grave hut to Omeo towing a Tvan. I think I was in either 1st high range or 2nd low range for the 700m descent - relying on the engine braking.

    When I got to the bottom I noticed the engine check light and (I think) stability control lights were on. I have a ScanGauge so I checked the fault code - P0299. I left it alone (ie didn't clear it) and later that day the lights went off (though the ScanGauge still shows the fault code)

    Looking around it seems the code means "turbo underboost":
    Turbocharger/Supercharger "A" Underboost Condition
    Read more at: http://www.obd-codes.com/p0299

    The P0299 DTC code refers to a condition where the PCM/ECM (powertrain/engine control module) has detected that the bank "A" or single turbocharger or supercharger is not providing a normal amount of boost. That could be due to a variety of reasons, which we detail below. On a normally operating turbocharged or supercharged engine the air going into the engine is pressurized and that's part of what makes so much power for an engine of it's size. If this code is set, you will likely notice reduced power output.
    The car is 18 months old and has done 31000kms. I have an EGR blanking plate but haven't installed it. The engine is standard apart from a Safari Snorkel.

    Any ideas what might have caused it? Should I be worried? Should I take it back to Toyota to get them to check it in case something comes up later with the warranty?

  • #2
    P0299


    Turbocharger / Supercharger Underboost

    maybe sticking egr valve or vane solenoid

    18 months and only 31k take it back to dealer and make sure logged in service history

    cheers
    mike
    White 2010 gx diesel auto, bilstein shocks 50mm lift king springs, tjm steps, warn 9500, lt265-65-17 bfg atko on steel rims. Racor 230R10 filter
    Adelaide based

    Comment


    • #3
      P0299 is usually a loose/leaking intercooler hose. Tighten up hose clamps - job done!

      Comment


      • #4
        They shouldn't have come loose (yet)! I'm taking it into Toyota on Thursday so they can take a look.

        Comment


        • #5
          warranty!

          Comment


          • #6
            So Chatswood Toyota took a look and couldn't find anything - no great suprise.

            I'm a bit puzzled by their first phone call - they said the turbo was "locking up" or something. The next day they said they couldn't find it.

            Hmmm. I guess we'll see if it happens again.

            Comment


            • #7
              Peter,

              Did you ever get to the bottom of your P0299 code? Has the issue ever occurred again?

              I've just experienced a similar issue. Towing a 2 tonne van down the Clyde in first gear high so as to be gentle on the brakes. So the engine was doing between 3000-4000RPM for probably just over 5 mins during the main descent. We used first gear again several minutes later in slow traffic behind a semi. Engine braking performance was normal throughout, but then as I let the auto upshift as the descent eased off I noticed the gear changes were unusually lazy. By this I mean the engine speed would drop to idle and then maybe 1-2 seconds later the higher gear would engage with revs coming back up. Anyhow, I didn't think a lot of it until a few minutes later driving on some slight uphills I noticed the engine had very little power. In my case there was no check-engine light, but it was literally like there was a block of wood behind the throttle preventing it from being depressed more than say 10%. There were no other abnormal symptoms. Anyhow I pulled over for fear of not actually making it up the incline, and let the engine idle for approx 10 mins in Park. Then shut it down to connect my OBD II bluetooth scanner, and it reported code P0299.

              Under boost certainly explains my symptoms, but why? Can such engine braking overheat the auto transmission, and thus the ECU deliberately limits boost to reduce load under power? Or should the torque converter be locked up in an engine braking situation at such high RPM?

              After reading the code I cautiously resumed driving and everything was back to normal, with engine performance fine for the rest of the weekend (including the ascent back up the Clyde).

              Is your Prado manual or auto?

              Given we've both seen this occur after significant engine braking and it then recovers, I'm thinking it's got to be by design rather than a loose/leaking hose?

              Any ideas on why this occurs would be most appreciated.

              Cheers,

              David.
              [SIZE=2][U]2012 150 Series D4D Kakadu[/U][/SIZE]
              [SIZE=1]Wynnum Towbar, Narva Merit/USB/lighter sockets, Pirahna dual battery tray, Redarc BCDC1240, Xantrex LinkPro battery monitor, 600W inverter, ARB onboard air & WaterWatch on AMTS bracket, Phillips 35W HID high beams, UHF, Roadsafe front recovery points, Offroad Systems drawers with integrated water storage with tap concealed in rear tailgate, ARB 47L fridge.[/SIZE]

              Comment


              • #8
                Originally posted by D4DDave View Post
                Did you ever get to the bottom of your P0299 code? Has the issue ever occurred again?
                Never got to the bottom of it - Toyota checked it over when I got back to Sydney and couldn't find a problem. It hasn't ever happened again even though I've done lots of other long descents using engine braking though perhaps not as long without touching the accelerator at all (ie engine brake/accelerate/engine brake down the hill).

                Originally posted by D4DDave View Post
                Is your Prado manual or auto?
                Auto diesel.

                Comment


                • #9
                  Thanks Peter.
                  [SIZE=2][U]2012 150 Series D4D Kakadu[/U][/SIZE]
                  [SIZE=1]Wynnum Towbar, Narva Merit/USB/lighter sockets, Pirahna dual battery tray, Redarc BCDC1240, Xantrex LinkPro battery monitor, 600W inverter, ARB onboard air & WaterWatch on AMTS bracket, Phillips 35W HID high beams, UHF, Roadsafe front recovery points, Offroad Systems drawers with integrated water storage with tap concealed in rear tailgate, ARB 47L fridge.[/SIZE]

                  Comment


                  • #10
                    I came down from Mt St Leonards (NE of Melbourne) on the w/e towing the camper and using engine braking - its about a 350m descent in 3.5km. I was half expecting the check engine light to come on but it didn't. Still have no idea what caused it to happen the first time.

                    Comment


                    • #11
                      Interesting that it didn't happen again. Perhaps the engine braking was not as severe as in the first instance?

                      My gut feel, given that in my case it was coupled with lazy gear changes, is that the transmission was overheating from the engine braking, and thus the ECU wound down the boost deliberately, which of course if the overheating was due to ascending, would ease the strain on the auto. But of course since I was descending, the transmission would have got no rest at all until I allowed it to upshift. Hopefully no damage is done.

                      I've actually been trying to my Torque smartphone app (coupled with my Bluetooth OBD2 adapter) to display the transmission's pan and torque converter temps so I can monitor the temperatures during ascents and descents, but despite reading other threads on this forum on the topic, have not got it to work yet.

                      David.
                      [SIZE=2][U]2012 150 Series D4D Kakadu[/U][/SIZE]
                      [SIZE=1]Wynnum Towbar, Narva Merit/USB/lighter sockets, Pirahna dual battery tray, Redarc BCDC1240, Xantrex LinkPro battery monitor, 600W inverter, ARB onboard air & WaterWatch on AMTS bracket, Phillips 35W HID high beams, UHF, Roadsafe front recovery points, Offroad Systems drawers with integrated water storage with tap concealed in rear tailgate, ARB 47L fridge.[/SIZE]

                      Comment


                      • #12
                        Interesting that it didn't happen again. Perhaps the engine braking was not as severe as in the first instance?

                        My gut feel, given that in my case it was coupled with lazy gear changes, is that the transmission was overheating from the engine braking, and thus the ECU wound down the boost deliberately, which of course if the overheating was due to ascending, would ease the strain on the auto. But of course since I was descending, the transmission would have got no rest at all until I allowed it to upshift. Hopefully no damage is done.

                        I've actually been trying to my Torque smartphone app (coupled with my Bluetooth OBD2 adapter) to display the transmission's pan and torque converter temps so I can monitor the temperatures during ascents and descents, but despite reading other threads on this forum on the topic, have not got it to work yet.

                        David.
                        [SIZE=2][U]2012 150 Series D4D Kakadu[/U][/SIZE]
                        [SIZE=1]Wynnum Towbar, Narva Merit/USB/lighter sockets, Pirahna dual battery tray, Redarc BCDC1240, Xantrex LinkPro battery monitor, 600W inverter, ARB onboard air & WaterWatch on AMTS bracket, Phillips 35W HID high beams, UHF, Roadsafe front recovery points, Offroad Systems drawers with integrated water storage with tap concealed in rear tailgate, ARB 47L fridge.[/SIZE]

                        Comment


                        • #13
                          My P0299 was a broken turbo actuator. 2009 150 Diesel auto.

                          Comment


                          • #14
                            This happened again to me on the weekend - I suspect after coming down from the Blue Mountains into Sydney towing a Tvan on Bells Line of Road. It was fine going up the mountain but once we got to the flats it seemed to lack power. I've got Torque Pro and it was showing no boost and a "pending" P0299 fault code that I couldn't clear. The transmission didn't overheat going down the hill so it wasn't related to that. I drove for about 60 mins like that - it was annoying and noticable but not tragically bad. Once I stopped the engine and restarted things went back to normal. Weird.

                            Comment


                            • #15
                              That fault code uses the Target Boost Pressure commanded by the ECU compared to the MAP sensor reading, a P0299 is declared under 2 Trip Logic when 'The pressure is 55 kPa below the Target Booster Pressure for 40 seconds at an engine speed of 2800 to 4400 rpm' so needs to happen twice.

                              I am assuming with foot off the accelerator and under sustained engine braking the Turbo Boost Target would remain low and the MAP value very low or negative compared to local barometric pressure (i.e. in vaccum or negative boost like at idle), the trick will be to work out what causes it to go over the 55kPA differential for the 40 seconds or more at least twice.

                              Just a few guesses for a start point but others more knowledgeable maybe able to correct or chip in with better ideas :
                              • Minor crack/leak in the MAP Sensor Filter or hoses that the turbo is making up for under normal conditions?
                              • EGR Valve or throttle body opening or closing incorrectly for some reason?
                              • Turbo Vane Actuator being driven or drawn into incorrect position?
                              • ECU confused by sensor readings and commanding too much Target Boost for conditions when fuel is shut off?

                              These two readings are easily monitored on your scantool so maybe put on screen next time you are going into areas that could possibly trigger the condition and see what is happening in real time.

                              Edit: The Workshop Manual Tech Tips for the P0299 refer you to P0046 which is to do with the Turbo Actuator Motor duty cycle and over current conditions so may be another pointer to possibly a turbo vane/actuator restriction/movement issue effecting MAP reading but not serious enough to trigger this code.
                              ptommo59
                              Member
                              Last edited by ptommo59; 13-09-2023, 02:49 PM.

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