TSB: 18-005-23 - 2022 trucks - Excessive regens - *P0299 - Turbocharger Underboost - etc.

[Brutal_HO]

https://static.nhtsa.gov/odi/tsbs/2023/MC-10231776-9999.pdf

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 (DTCs) have been
set:
• **P0299 Turbocharger Underboost.**
• P026B00 Injection Timing Performance.
• P061B00 Internal Control Module Torque Calculation Performance.
• P145100 Diesel Particulate Filter System Performance.
• P075500 Shift Solenoid “B” (DG7 Trans Sales Code). [mod: 68RFE]
• P076500 Shift Solenoid ”D“(DG7 Only).
• P040100 EGR System Performance

Customers may also experience the following:
• **Service Exhaust System message in the Electronic Vehicle Information Center (EVIC) with no MIL.**
• Improvements to cold temperature engine rpm fluctuation.
• Reduce audible engine flare during upshifts (DG7 Only).
• Improvements to help prevent OD clutch premature wear (DG7 Only).
• 1-2-1 gear hunting on grades while operating under high loads in areas of low traction (e.g. rain, snow, ice or dirt) (DG7 Only).
• wiTECH Fuel System RunUp Test routine Improvement.
• Idle stability Improvement.
• wiTECH PCM data improvements.
• wiTECH cylinder cutout routine, improvement.

 

[Jimmy Dean]

It says “may experience” a malfunction light, does that mean we might have this and not know? Also what is the fix?

 

[Brutal_HO]

It says “may experience” a malfunction light, does that mean we might have this and not know? Also what is the fix?

If you read the doc, the fix is a PCM update.

 

[RV_Goose]

I just got the P026B-00 code when the CEL came on. I had just had the engine oil changed, Aisin tranny filter changed and both fuel filters changed at a local independent shop. I went back to them and they found the P026B-00 code, and could not clear it. So I took it in to the dealer. They updated the software and the CEL is now gone. Only drove it 20 miles, with a couple of restarts.

Hoping that it is now gone for good. And that other issues are not created by this update.
I have considered buying a older diesel truck, but apparently others are already doing so and then refitting them. One local fellow has $30K into his refurbished 1986 (??) Dodge dually. He found a whole new diesel drive train in a junk yard to put into his old truck. He's pulling a restored AirStream camper with it. He said that the $30k was cheaper than the newer diesels, and the truck will probably outlast him (he's 68).