I am posting this for
@Thorvald
- TSB# 18-067-23
- TSB description
- Models and years affected:
- 2020 (DJ) RAM 2500 Pickup
- 2020 (D2) RAM 3500 Pickup
- This bulletin applies to vehicles equipped with a 6.7L I6 Cummins
- Turbo Diesel Engine (Sales Code ETL) or a 6.7L I6 Cummins HO
- Turbo Diesel Engine (Sales Code ETM).
- North America
- A link to TSB or PDF or upload an attachment
Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTC)s have been set:
• **P029900 Turbocharger Underboost.
• P061B00 Internal Control Module Torque Calculation Performance.
• P046100 Fuel Level Sensor 1 Performance.**
• P0506 Idle Control System RPM Lower Than Expected.
• P20EE00 NOx Catalyst Efficiency Below Threshold.
• P242F00 Diesel Particulate Filter Restriction Ash Accumulation.
• P145100 Diesel Particulate Filter System Performance.
• P246300 Diesel Particulate Filter Restriction Soot Accumulation Bank 1.
• P026B Injection Timing Performance.
• P060700 ECU Internal Performance.
• P20E800 Reductant Pressure Too Low.
• P030100 Cylinder1 Misfire.
• P030200 Cylinder 2 Misfire.
• P030300 Cylinder 3 Misfire.
• P030400 Cylinder 4 Misfire.
• P030500 Cylinder 5 Misfire.
• P030600 Cylinder 6 Misfire.
• P1C5400 SCR NOx Catalyst Missing.
• P270600 MS Solenoid Circuit (68RFE Only).
• P1D7300 AGS Performance.
• P24A500 EGR Cooler Bypass Bank 1 Control Stuck (Sales Code ETM).
• P042000 Catalyst System Efficiency Below Threshold Bank 1 (Sales Code ETM).
• P200200 Diesel Particulate Filter Efficiency Below Threshold (Sales Code ETM).
• P019100 Fuel Rail Pressure Sensor Circuit Performance (Sales Code ETM).
• P040100 EGR System Performance (Sales Code ETM).
• P208B00 Reductant Pump 1 Control Performance (Sales Code ETM).
The following improvements are also included in this update:
• **Transmission overheat protection (DG7 Only).**
• Adaptive Cruise improvements at high altitude.
• Ambient Air Pressure displayed correctly in wiTECH.
• Oil pressure switch modification.
• Oil change monitor improvement for severe duty operation.
• wiTECH “Fuel Injector Cutoff Test” fix.
• wiTECH Mass Air Flow (MAF) Sensor data display additional fix.
• Enabling wiTECH Particulate Matter (PM) Sensor Regeneration Test in PCM “Misc Functions”.
• Engine Warmup Protection Improvement to help promote better oil delivery to engine bearings
during cold starts.
• Hydrocarbon Desorption (HCD) Mode operational improvement. HCD mode resumes after key
cycle.
• Engine stumble improvement, during engine warm up (Sales Code ETM).
• Smoke improvement during highway driving and lower altitudes (sea level) (Sales Code ETM).
The customer may also notice one or more of the following:
• Idle Instability.
• Harsh downshift clunk during exhaust brake deceleration.
• Diesel Exhaust Fluid (DEF) gauge erratic when DEF level is low.
• Stall when putting in reverse in cold ambient temps.
• Engine stumble during engine warm up.
• Unstable idle when AC compressor cycles.
• Engine surge felt while driving (Sales Code ETM).
• Idle fluctuation.
This bulletin supersedes Technical Service Bulletin (TSB) 18-102-22 REV. A, date of issue August 10, 2022, which should be removed from your files. All revisions are highlighted with **asterisks** and include DTC, additional software enhancements and LOPS.
This Technical Service Bulletin (TSB) has also been released as a Rapid Service Update (RSU) 21027, date of issue March 05, 2021. All applicable RSU VINs have been loaded. To verify this RSU service action is applicable to the vehicle, use VIP or perform a VIN search in DealerCONNECT/Service Library. All repairs are reimbursable within the provisions of warranty. This RSU will expire 18 months after the date of issue.
NOTE: This calibration update is only for vehicles that have had the updated CP3.3 design High Pressure Fuel Injection Pump installed. All other calibrations to support the CP4 design pump have been deactivated. DO NOT perform this calibration update unless recall Y78 has been performed first.