Engine Controls - MIL ON/DTC P0471 Set In Freezing Temps
NUMBER: 25-001-12GROUP: Emissions Control
DATE: May 03, 2012
SUBJECT:
Diagnostic Trouble Code (DTC) P0471 Set In Temperatures Below Freezing
OVERVIEW:
This bulletin involves installing an insulated Exhaust Manifold Pressure (EMP) sensor tube and insulation over the EMP sensor along with a new EMP sensor.
MODELS:
2010 - 2012 DJ/D2 Ram 2500/3500 Pickup
2011 - 2012 DD/DP Ram 3500/4500/5500 Cab Chassis
NOTE:
This bulletin applies to Ram Trucks equipped with the 6.7L Cummins Diesel Engine (Sales Code ETJ).
SYMPTOM/CONDITION:
During the normal combustion process, condensation can form in the EMP sensor tube.Rarely, this condensation may contact the EMP sensor pressure sensing element. If the vehicle is operating in temperatures below freezing (32°F./0°C.), the condensation may freeze. The expanding moisture as it freezes could cause the pressure sensing element to crack causing damage to the EMP sensor and setting DTC P0471 "EXHAUST PRESSURE SENSOR 1 PERFORMANCE." DTC P0471 will illuminate the MIL immediately after the fault becomes active.
DIAGNOSIS:
If the MIL is illuminated for DTC P0471 and temperatures are below freezing or recently have been below freezing, perform the Repair Procedure.
PARTS REQUIRED:
REPAIR PROCEDURE:
1. Install the Exhaust Manifold Pressure Sensor Insulating Kit (p/n 68175216AA) and a new Exhaust Manifold Pressure Sensor (p/n 68002442AA). Refer to the Instruction Sheet (p/n K6855786) located in the kit for additional information.
2. Connect the Diagnostic Scan Tool and erase the DTC's. Then, start the engine while monitoring DTC's to ensure that P0471 does not return.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.