Truck died on the highway this morning, only P2447 is present.

So I've had my truck for about 6ish years now and I haven't had any problems thus far. It's a 2010 4.6 V8 1UR-FE. This morning on my way to work, I lost all acceleration and even with the pedal to the floor, I had nothing. Eventually, I pulled over and got it towed as after I came to a complete stop, I couldn't even get the engine to turn over. Truck's been sitting all day (I'm a mechanic so I work at a shop and it's here with me now) and still I can't get it to start. It just cranks unless I stomp the pedal to the floor where it eventually turns over and then shuts off immediately. The only code I'm getting is P2447. I've had this code in the past and I've just cleared it to get the truck out of limp mode and it usually doesn't come back for a long while regardless of the weather (I'm in the Northeast so we get both extremes of hot and cold). Now I am aware that the secondary air injection system is known to go bad and I was planning on buying a bypass kit eventually, but does anybody know if this would stop the truck from running? I will have time to go over the normal diagnostics for a no start sometime this week but as of today I just don't have the time so I was wondering if anybody here who had these codes in the past also experienced a no start after getting these codes. Thanks for any advice!

 

I think it is possible to have the symptoms you are describing if the SAIS is malfunctioning. I would call Hewitt - they're know to be very helpful and answer questions. https://hewitt-tech.com/

This is directly from the product page:
**There is a known “Cold Weather Glitch” on some older 4.7L engines. If the vehicle is tripping a P2445 and it is caused by this glitch; the Hewitt Technologies SAIS Bypass Kit will not resolve the issues. Please visit our Error Codes page or give us a call to learn more.

P2445 – Pump Stuck OFF Bank 1
This code is normally caused by the secondary air injection pump not being able to create proper air pressure because the pump impeller is damaged or the air pump motor has been damaged and/or blown the air pump fuse. If the air pump motor has been damaged, it is common to also see a P0418 code that indicates this. If the air pump fuse has blown, this code will display but you may not see a P0418 code until the fuse is replaced. If you only see the P2445 code during a cold start, the Hewitt-Tech bypass kit can clear it.

*On some 2005-06 vehicles with 4.7L engines, there is a known freezing temperature glitch in the ECM that can occur when driving in near-freezing or below-freezing temperatures. If you start your vehicle in freezing temperatures, and the P2445 code displays as you near 50 mph, a glitch in the ECM is the cause. However, that is not normally how a P2445 code is thrown, and it also does not typically cause limp mode. If you have a Hewitt-Tech bypass kit installed on your vehicle, there is nothing wrong with the kit, it is a program glitch in the ECM. This glitch has been confirmed to happen on vehicles with or without the Hewitt-Tech module installed, as well as on vehicles with no other SAIS problems and even on vehicles that have had the entire secondary air injection system replaced with new.

The only known solution for this cold weather glitch is a re-flash of the computer as outlined in a very specific but no longer available limited service campaign from Toyota. This limited service campaign was specific to code P2445 coming on while driving in the same drive cycle as being started with the engine at a freezing temp. This limited service campaign expired or was intentionally removed from the system when the service bulletin for codes P0418/P2445 came out and directs the service managers and techs to replace the entire system. This would leave one to believe replacing the Air Injection Control driver with the new part number would remedy the problem but it has been proven to not be the case. Replacing the entire system does not resolved the cold weather issue as there is no computer update (re-flash) done under this service bulletin.

We have currently exhausted all ideas and efforts to resolve this freezing temp. issue and are now currently only aware 2 ways to deal with it. The first solution is an active way of preventing the glitch from occurring by using a startup/warmup/shutdown/restart sequence to prevent the freezing temperature glitch from happening. To do this it is first necessary to recognize that the engine temperature is at or below freezing at startup if the engine has been off for 7 hours or more (cold start). If so start the engine and let the engine warm up until at least the engine temperature gauge starts to move (only needs to be above freezing), turn the engine off and restart before driving or needing to drive above 50-55MPH. This will cause the engine start temperature to be freezing and in a second drive cycle which will preventing the glitch from happening when driving at 50MPH or more under the freezing start condition. The vehicle can also be started and then driven for a short while to warm it up as long as vehicle speed does not exceed 50MPH or the engine is shutoff and restarted before exceeding 50MPH. Again, this warmup/shutdown/restart cycle would only need to be performed if the temperature is at or below freezing when the vehicle has been sitting off for 7 hrs. or longer.

The other way of dealing with the issue is just to be prepared for it to happen and clear the code when it does. In many areas temperatures rarely get to freezing or below or at least do not stay there for long. In these cases it is easiest just to clear the P2445 trouble code when this happens by pulling over and using an OBDII tool or disconnecting the negative battery terminal for 5 min. Once cleared the glitch will not occur again until the first drive cycle when the vehicle has been off for 7 hrs. or more and in the first cold start drive cycle you exceed 50MPH. However, this would have to be done every time the glitch occurs to get out of limp mode.

There is still a possibility we may be able to find a solution to this freezing temp problem but currently these are the only 2 ways we know of. If you are experiencing this problem it will stop happening when your startup temperatures are again above freezing. if you have questions about these procedures call us TOLL-FREE at 1-800-307-7671.

 

I have a similar problem on my 2012 but with 5.7 any a idea what my problem may be

 

Haven't had much time to look at mine since I've been in the process of moving to a new job and just haven't had time. Looking at the prior answer I received I'm going to call Hewitt once I get a minute and see if they could at least give me some answers before I just start from scratch and start checking fuel pressure, compression, etc. If I find out anything I'll update this thread for you and any others that are curious.