What do P0299 and P2263 together mean?

Not by itself. In Ford’s diesel OBD operation summary, P0299 is “Turbocharger/Supercharger ‘A’ Underboost Condition,” while P2263 is “Turbocharger ‘A’ Boost System Performance.” That makes the pair a clue that the vehicle recorded concerns involving boost, but the codes do not establish that a particular part has failed. [S1]

The important limitation is application: the cited summary describes monitor conditions for particular 3.0L and 6.7L diesel applications. It does not establish definitions or diagnostic steps for every vehicle. [S1] Start by identifying the exact year, make, model, and engine; then establish whether each code is current, pending, or stored, and collect the available freeze-frame context. A qualified technician can compare those records with the service information for that vehicle.

Make a short record without trying to interpret it as a repair diagnosis:

1. Year, make, model, engine, and—if known—vehicle mileage.
2. The exact codes as displayed, including whether each is current, pending, or stored. If you do not know the status, write “unknown.”
3. The freeze-frame information available for each code, or note that it was not provided. Include the recorded conditions as displayed rather than guessing what they mean.
4. When the warning appeared and what you noticed around that time, such as a change in how the vehicle behaved. Describe observations, not presumed causes.
5. Whether the codes returned after being cleared, if that happened already.

The Ford summary mentions desired-versus-actual boost thresholds for certain applications, but it does not supply a universal interpretation or testing procedure for all vehicles. [S1] Ask the shop to use the applicable service information rather than applying those application-specific details to an unconfirmed vehicle.

Use a concise handoff like this. The bracketed fields are placeholders; fill in only what you know:

“Vehicle: [year, make, model, engine]. Codes: P0299 [status or unknown] and P2263 [status or unknown]. Freeze-frame information available: [brief notes or not provided]. I first noticed the warning [when/under what observed circumstances]. Other changes I noticed: [plain description or none noticed]. Please check the vehicle-specific definitions and service information, review the code status and freeze-frame context, and explain what additional evidence supports any proposed repair.”

For example, assume—not as a real vehicle—that someone has an unspecified model and only knows that both codes appeared. Their responsible summary would say “engine and code status not confirmed; freeze-frame information not provided,” rather than claiming that the turbo failed. This keeps missing information visible and gives the technician a focused starting point.

Ask the technician to confirm the exact vehicle application and explain how each code is defined for it. Then ask what the code status and freeze-frame records show, what vehicle-specific service information was consulted, and what evidence links the proposed repair to the recorded concern. If the explanation jumps straight from the code pair to replacing a turbocharger, ask what findings support that conclusion and what alternatives were considered.

The cited source establishes the code descriptions and gives application-specific monitor context; it does not identify the cause on your vehicle, prove a component has failed, or provide a diagnosis for every make and model. [S1] Keep the codes and records available, and leave testing and repair decisions to a qualified professional using the correct service information.