P0299 on Ram vehicles The turbocharger or supercharger is not making the boost the computer asked for

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Bulletins and campaigns Ram filed with NHTSA whose summary names P0299. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• S2018000007 Service bulletin
  2020-06-03 · Engine And Engine Cooling — Engine — Other Fuel Types — Turbo/Supercharger
• Diagnostic Trouble Code (DTC) P0299 ? Turbocharger Underboost Additional Diagnostics
• S2018000007 Rev. Service bulletin
  2020-09-01 · Engine
• (Revision A) Diagnostic Trouble Code (DTC) P0299 ? Turbocharger Underboost Additional Diagnostics
• S2018000007 Rev. Service bulletin
  2021-02-22 · Engine And Engine Cooling — Engine — Gasoline — Turbo/Supercharger
• Diagnostic Trouble Code (DTC) P0299 ? Turbocharger Underboost Additional Diagnostics
• 18-093-22 Service bulletin
  2022-05-10 · Power Train
• Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module/Powertrain ControlModule (ECM/PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or moreof the following DTCs have been set: P0299 - Turbocharger Underboost. P0401
• 1802423 Service bulletin
  2023-05-24 · Power Train
• Flash: Powertrain Control Module (PCM) Updates 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: ? **P0299 - Turbocharger Underboost.** ? P061B - Internal Control Module Torque Calculation Performance. ? P0755 - Shift Solenoid B (DG7 Only). ?
• 9100678 Service bulletin
  2025-10-29 · Engine
• 1. General Parts Update The recommended air filter for 2019 Model Year (MY) and newer 6.7L Cummins equipped vehicles has been updated. New Part: 68645327AA (Non-Oiled Air Filter) Replaces: 53034051AA (Oiled Air Filter) - This part is superseded and should no longer be installed. The air filter for all other applications remains unchanged: Continue to use 68517554AA for: All 2018 MY and older 6.7L
• 18-005-23 Service bulletin
  2023-01-12 · Exterior Lighting
• Flash: Powertrain Control Module (PCM) Updates 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.** P026B-00 - Injection Timing Performance. P061B-00 - Internal Control Module Torque Calculation Performance.
• 09-003-26 Service bulletin
  2026-02-24 · Engine
• Cummins 6.7L Air Filter Replacement DTC P0299 Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ● P0299-00 - Turbocharger Underboost. Customers may also comment on the following: ● Low power/acceleration or lag condition. This bulletin involves performing an Air Handling Performance Test
• S2018000008 Service bulletin
  2020-06-19 · Power Train
• Engine Surge Feel and/or Diagnostic Trouble Code P0299 ? Turbo Underboost Condition After Updating The Powertrain Control Module (PCM) Software. (ETL, ETM, ETN Engines)
• S2218000022 Service bulletin
  2022-12-09 · Electrical System
• Perceived Low Power/Acceleration Lag, And/Or Malfunction Indicator Lamp (MIL) Illumination, Diagnostic Trouble Codes (DTCs) P0299 Turbocharger Underboost And/Or P026D ? Fuel Injection Quantity Higher Than Expected, Set.

A stored code names the test that failed, never the part that caused it. The record above is what Ram and its owners have filed about it; the code’s page across every make has the whole file.