Problem explainer
6.7 Powerstroke P0299 and Low Boost: Check the Charge Air Tubes Before the Turbo
Published · 9 min read
P0299 means the engine computer saw less boost than it asked for. On a 6.7 Power Stroke the expensive guess is the turbo, which owners have been quoted about $5,100 to replace at a dealer. Ford's own bulletin for 2011-2016 trucks points somewhere cheaper first: the tube that carries cooled boost air to the throttle body, which can pull off or separate at its crimp clamp.
This guide puts the checks in order. It is built from 144 NHTSA complaints about low boost, the turbo, charge air tubes, power loss or limp mode on 2011-2026 Super Duty diesels, Ford's service bulletins and special service messages, and current part prices.
The short answer
- What P0299 means: underboost. The leak or fault can be anywhere between the turbo and the intake: the charge air (intercooler) tubes and clamps, the turbo's vane actuator, the turbo itself, or a sensor.
- Check first: the charge air tubes. Ford's bulletin 19-2143 says P0299 and lack of power on 2011-2016 trucks may come from the cooler outlet tube disconnecting at the throttle body or separating at its crimp clamp. A pressure or smoke test finds it.
- By generation: 2011-2014 turbos are known for bearing failures with a rising whine; on 2020-2022 trucks Ford released the vane actuator as a separate part, so a full turbo is often not needed.
- Not every power loss is boost: of 144 power-loss complaints, 87 name only the fuel pump or the DPF/DEF system. Read the codes before anyone touches the turbo.
- What it costs: turbo assemblies list at about $1,203 to $1,942 depending on the year; the charge air cooler about $740. Owners report dealer turbo quotes of about $5,100.
The one idea: boost has a long path, and a leak anywhere looks like a bad turbo
- The turbo makes boost verifiedA turbo compresses intake air; on most years it is a variable-geometry turbo controlled by an electronic vane actuator.
- The air is cooled aggregatedIt passes through the charge air cooler (intercooler) and a set of plastic and rubber tubes, boots and clamps.
- Then into the engine verifiedThe cold-side outlet tube feeds the throttle body. If a tube cracks, a boot slips or a crimp separates, boost escapes.
- The computer sees low boost verifiedIt sets P0299 and cuts power. From the driver's seat a blown tube and a failed turbo feel the same.
That is why our failure record says to pressure-test the charge air system before condemning the turbo for a P0299. verified
What owners named when the engine lost power
- Turbo, vanes or actuator18
- Charge air tube, boot or clamp7
- Boost or MAP sensor1
- Code P0299 or 'underboost' named1
- Fuel pump or fuel system (not boost)63
- DPF or DEF derate (not boost)34
- EGR2
The boost side Power loss from other systems
Source: NHTSA owner complaints on 2011-2026 Ford Super Duty diesels (the set of our 6.7 Power Stroke problems report). Keyword-matched and read by hand. A count of reports, not a failure rate.
The boost side (turbo, tubes, sensors, the code itself) accounts for 23 complaints. The fuel system, mostly the CP4 high-pressure pump, is named in 63, and the DPF or DEF in 34. Owners rarely write the code: P0299 or "underboost" appears in one complaint. Most describe a sudden loss of power on the highway, a loud bang or "the truck went into limp mode."
Step 1: is it really boost? Read the codes first
What to do. Scan for stored and pending codes before anything is replaced.
What you will see, and what it points to.
- P0299 (underboost), P0234 (overboost), turbo actuator codes (P003A, P0045 to P0048): the boost side; continue to Steps 2 and 3. verified
- Fuel rail pressure codes (P0087, P0088): the fuel side, often the CP4 pump. Our 6.7 Power Stroke problems report covers it. aggregated
- DEF codes such as P206C: a DEF derate, not boost. Ford told technicians that P206C is often caused by DEF concentration below 28%, which sets the code and derates the truck; replace the fluid with known good DEF before replacing parts (SSM 47712). verified
Step 2: the charge air tubes and the intercooler
What to do. With the engine off, look at every charge air tube, boot and clamp between the turbo, the charge air cooler and the throttle body. Then have the system pressure-tested or smoke-tested with the truck capped.
What you will see. A boot pushed off, a cracked plastic tube or a tube separated at its crimped end means a leak. Oily film at the joints is common; a wet, oily joint with a hiss under load is a leak. aggregated
What Ford says. For 2011-2016 Super Duty with the 6.7, bulletin 19-2143 (2019) covers lack of power and P0299 caused by the charge air cooler outlet tube "becoming disconnected at the throttle body or a separation at the CAC tube crimp clamp," fixed by replacing the outlet tube assembly. verified
"Plastic connection broke causing a sudden loss of power at highway speed."
A fleet owner with 2012 F-350s, 2014, reporting four failures of the same turbo tube. NHTSA complaint 10664069
"The 'cold air tube/hose' for the turbo catastrophically ruptured and blew pieces and oil across the top of the engine."
Owner of a 2012 F-350, 2018. NHTSA complaint 11096459
Condensation. The 6.7's charge air cooler can collect water from humid air under light load; a hard acceleration then pulls it in, causing a stumble or misfire rather than a P0299. Our record treats it as owner and shop experience, not a Ford bulletin. aggregated
What it costs. Tube and boot repairs are mostly parts in the tens to low hundreds of dollars plus labor; aftermarket hot- and cold-side tube sets list at about $598. A charge air cooler lists at about $740.
Step 3: the turbo and its actuator, by generation
Normal first. Ford told technicians that some turbo behavior on these trucks is characteristic, not a fault: turbo lag accelerating from a stop on 2011-2014 trucks (ASI-44122), turbo noise and an oscillating whine while the oil is cold (ASI-32203, ASI-44121), and a shudder or turbo flutter at a steady 900-1,400 rpm on 2011-2012 trucks (13-4-3). verified
- 2011-2014 (first generation). A turbo on ceramic ball bearings, which shops call the signature failure of these years: a whine or screech that rises with engine speed, shaft play, oil in the charge piping. Ford extended turbo coverage on 2011-2012 F-450 and F-550 trucks (program 18M05). verified A first-generation turbo lists at about $1,942.
- 2015-2019. A larger turbo on journal bearings; failures show up as P0299, P0234 or actuator codes without the bearing noise. verified For 2015-2016 pickups built from February 2016, Ford changed the turbo to an internal oil supply, so replacement parts differ (SSM 46027). verified
- 2020-2022. Ford's special service messages 50564 and 51150 cover a check-engine light, lack of power and excessive turbo noise with codes including P003A, P0045 to P0048 and P0234: if diagnosis leads to the vane actuator, "replacement of the turbocharger assembly is no longer required," because the actuator is sold separately. verified A 2020-2022 turbo assembly lists at about $1,793.
- 2023-2026. A turbo assembly lists at about $1,203 (standard) to $1,273 (high output).
If the turbo is replaced. Ford requires the turbo oil supply filter to be replaced with the turbo, because a restricted filter can starve the new bearings (SSM 47948), and describes draining oil left in the exhaust after a turbo replacement (SSM 49805). verified Ask the shop whether both were handled.
What owners paid. One 2015 owner was quoted about $5,100 at a dealer in 2025 for a new turbo at 58,000 miles. Turbo complaints by generation in our data: 8 on 2011-2014 trucks, 9 on 2015-2019, 1 on 2020 and later.
What you found, and what to do
| You found | It probably means | What it can cost | Our take |
|---|---|---|---|
| P0299 on a 2011-2016, no turbo noise | Charge air cooler outlet tube or clamp (bulletin 19-2143) | Tube assembly; aftermarket sets about $598 | Pressure-test first |
| A boot off or a cracked tube after a bang | Charge air leak | Tube or boot, plus labor | Fix the tube before anything else |
| Rising whine, shaft play on a 2011-2014 | First-generation turbo bearings | About $1,942 for the turbo; check program 18M05 on F-450/F-550 | Investigate |
| Actuator codes on a 2020-2022 | Vane actuator | Actuator sold separately per Ford | Ask for the actuator, not a whole turbo |
| P0087 or P0088 with the power loss | Fuel pressure, often the CP4 pump | Fuel system repair | Stop driving it and check the fuel side |
| P206C with a derate | DEF concentration | A fresh fill of DEF | Cheap fix first. |
Part prices are OEM list prices at the time of publication. Owner-reported costs come from NHTSA complaints and show what those owners were quoted in those years.
What we cannot tell you
- How often each cause sets P0299. Owners rarely write the code (one complaint names it), and complaints are reports, not failure rates.
- Whether your truck's tube matches the bulletin. Bulletin 19-2143 covers 2011-2016 trucks; we have not seen a matching bulletin for later years in NHTSA's index.
- The full text of Ford's bulletins. NHTSA's index carries titles and summaries; the repair procedures are in Ford's service information.
- The real failure rate of first-generation turbos. Shops call it common; NHTSA complaints name it only a handful of times.
FAQ
What does P0299 mean on a 6.7 Powerstroke?
P0299 is a turbo underboost code: the engine computer measured less boost than it commanded. On a 6.7 Power Stroke it can be a charge air tube or clamp leak, the turbo's vane actuator, the turbo itself or a sensor. Check for leaks first; on 2011-2016 trucks Ford has a bulletin (19-2143) for the cooler outlet tube.
Can a charge pipe cause P0299 on a 6.7 Powerstroke?
Yes. Ford's bulletin 19-2143 says P0299 and lack of power on 2011-2016 Super Duty trucks may be caused by the charge air cooler outlet tube disconnecting at the throttle body or separating at its crimp clamp. Owners also describe cracked plastic tubes and blown-off intercooler hoses with a loud bang and sudden power loss.
How much does it cost to replace a turbo on a 6.7 Powerstroke?
A turbo assembly lists at about $1,203 to $1,942 depending on the year, before labor. One owner was quoted about $5,100 at a dealer in 2025. On 2020-2022 trucks Ford sells the vane actuator separately, which can avoid replacing the whole turbo.
Is turbo lag normal on a 6.7 Powerstroke?
Some is. Ford told technicians that 2011-2014 trucks can have a characteristic turbo lag accelerating from a stop, and turbo noise or whine while the oil is cold. A rising screech, shaft play or a P0299 code is not normal.
Why does my 6.7 Powerstroke lose power and go into limp mode?
In NHTSA complaints the most common causes of power loss on these trucks are the CP4 fuel pump and the DPF or DEF system, more often than the turbo. Read the codes: fuel pressure codes point to the fuel side, P206C to the DEF fluid, and P0299 to the boost side.
Go deeper
Each of these pages shows the sources behind every claim, the confidence tier and the part numbers:
- Ford 6.7 Power Stroke platform page
- Failure modes: VGT turbo by generation · Intercooler and charge pipe · CP4 pump · DEF / SCR
- Repairs: Turbo repair by generation
- Parts: Turbo, 2011-2014 · Turbo, 2020-2022 · Charge air cooler
- Related: 6.7 Powerstroke problems by year · DEF warning and 5 mph derate · Sprinter limp mode: what owners say causes it · How we verify and tag facts
Sources. NHTSA owner complaints database (US government public domain), keyword-matched and read by hand, limited to 2011-2026 Super Duty diesel complaints about boost, the turbo, charge air tubes or power loss; owner quotes are taken from complaint narratives with capitalization normalized, and complaint numbers are given so you can read them in full. Ford communications 19-2143, 13-4-3, ASI-44122, ASI-32203, ASI-44121, SSM 46027, SSM 47712, SSM 47948, SSM 49805, SSM 50564, SSM 51150 and program 18M05 from NHTSA's manufacturer communications index. Turbo generations from the platform record. Part prices are list prices at the time of publication. Torque Index aggregates and cross-checks public information, takes no paid placement and does not provide repair or inspection services.