Hey guys, new to the board. I have a 2006 5.7L Hemi Ram 1500. Today I stalled at an intersection. Thankfully I just had a horn blown at me but no collision.

The ETC lightning bolt light and check engine light came on. The ETC light was flashing. I checked the owners manual and it didn't help much but did confirm that when flashing the truck may stall and could possibly need a tow. I limped the truck home since I was a few blocks from the house and did a search on the boards which helped tell me how to check for engine codes.

The code in the odometer readout gave me a "P0129" code then said "done", so I am presuming there is nothing else wrong.

I searched the "P0129" code and found the following.
One thread stated "Barametric Preassure Out Of Range"... this was on a list for 2nd gen trucks.
The only other reference listed the engine code twice, once stating the same as above and the other stating "Not Listed".

One, can anyone verify this code?
Two, if it is Barometric Pressure Out Of Range, can anyone help me understand what that means and get me started in the repair process?
Lastly, if it is something other than barometric pressure, can you help me determine what the P0129 code means and what I should be looking at for the 05 Ramm 1500 Hemi?

Thank you in advance. If needed, my phone number is 302-547-7715 and my email address is mercy.jantz@graniteshieldusa.com

 

One of two things commonly will cause a P0129. Either you stopped turning the key in the middle of cranking the engine before it turned over. Unfortunatley, this affects the air sensor and will cause the truck to run like sh*t until the code is cleared. If you do not own a tuner to clear the code with, just reset the PCM. If the code does not return, consider it problem solved and the truck will operate like normal. (Do a search if you do not know how to reset the PCM, there must be a couple dozen threads in this section on how to do it).

If the above does not work and the code returns, the other occurance is usually a very dirty throttle body and air sensor at the throttle body. Remove the throttle body, clean it and very carefully clean the sensor inside, it's easy to damage it. You could also just replace the sensor as they are not very expensive.

The only other cause I have ever seen is rare, but possible. A sensor within the ETC system may have developed a dead short. If the above two do not fix the problem, take a meter and check the voltage at the air sensor. If it is below 5v, start backchecking at the other sensors within the ETC system (cam sensor, crank sensor, TPS sensor) pulling each one and watching for your voltage to return to 5v. Then replace the sensor that's shorting the system...

 

You seem to have a good understanding of this. I'm having the same issue with the code. Have replaced every sensor. Replaced my tb alternator and battery. Replaced the pcm. Nothing has fixed it. I seem to only be getting 4.88 v to the map sensor. But I'm getting that straight from the pcm. I get the same volts with my old pcm and new pcm. Any ideas?

 

I have a 2006 5.7L Hemi Ram 1500


Lastly, if it is something other than barometric pressure, can you help me determine what the P0129 code means and what I should be looking at for the 05 Ramm 1500 Hemi?