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Robert R
Robert R, ASE Certified Master
Category: Dodge
Satisfied Customers: 4452
Experience:  Dodge Master Certified, Dodge Sprinter Certified
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I have a 2011 ram 6.7 code 471 I cleaned the tube replaced

Customer Question

I have a 2011 ram 6.7 code 471 I cleaned the tube replaced the sensor checked for exhaust pressure coming out of the tube before I installed the tube on to the t-stat housing cleaned the port in the sensor housing tested wires from sensor to pcm all good and p0471 comes back and it has code p2bac whats next?
Submitted: 1 year ago.
Category: Dodge
Expert:  Robert R replied 1 year ago.

Hello, welcome and thanks for asking your question. My name is*****'m a Certified Auto Technician with 28+ years experience. I will do my best to assist you. please keep in mind that I may need to ask questions of you before I can answer. When you reply please feel free to add as much detailed information as possible pertaining to your concern.

The sensor port in the thermostat housing tends to get plugged with hardened soot. Did you make sure that the port in the thermostat housing is clear all the way through? Most of the time when I have problems with the exhaust pressure sensor, I end up needing to drill out the port with a 1/8" drill bit to be absolutely sure that the port is clear....

If you are absolutely sure the port is clear then most likely the sensor itself is bad. If this is the case, the exhaust pressure sensor must be replaced.

Lastly, I did find a Technical Service Bulletin that includes a Flash Update for the ECM. This addresses some system and diagnostic improvements. The P0471 is listed in this TSB. It may be a good idea to have a dealer flash the ECM before replacing the Exhaust Pressure Sensor.

I'm posting some diagnostic info and a copy of the service bulletin for you to read through.

P0471 Diagnostic info ----> Click Here

Related Service Bulletin ----> Click Here

As for the P2BAC, this code WILL be able to be cleared once the P0471 is solved... P2BAC is basically just an informational code...

P2BAC info ----> Click Here

Keep me posted and let me know if you have any additional questions...

Thank you,



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Expert:  Robert R replied 1 year ago.


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