What are the most common causes of P0299?

The most common causes are: Boost leak from a split hose or loose coupler; Wastegate stuck open or faulty actuator; Faulty boost control solenoid or its vacuum lines; Restricted air intake or exhaust (including a clogged DPF on diesels); Worn or damaged turbocharger.

How much does it cost to fix P0299?

Typical US independent-shop repair cost for P0299 runs about $50 - $3,000, depending on the root cause. Common fixes: Replace an intercooler hose or coupler (about $100 - $400 at a shop); Replace the boost control solenoid (about $150 - $400 at a shop); Repair or replace the wastegate actuator (about $300 - $900 at a shop); Replace the turbocharger (about $1,200 - $3,000 at a shop).

Will P0299 clear itself?

No, not on its own. P0299 will keep coming back every time the relevant monitor re-runs until the underlying cause is actually repaired - clearing it with a scan tool without fixing what triggered it only delays the light coming back on.

P0299: Turbocharger / Supercharger Underboost Condition

P0299 quick answer

P0299 means the turbo or supercharger is making less boost than commanded. The most common fix is a split boost hose or loose coupler; wastegate problems and turbo wear come next.

Severity: Moderate
Can I drive? Usually yes for gentle driving, but avoid towing and hard acceleration until it is fixed.
Typical fix: $50 - $3,000

Also written as PO299 or P299.

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What P0299 means

P0299 means a turbocharged or supercharged engine is producing less boost pressure than the engine computer commanded. The most common cause is a boost leak - a split intercooler hose, a blown-off coupler, or a loose clamp - followed by wastegate or actuator problems and turbocharger wear. The engine usually runs but feels flat and may go into reduced-power mode.

Symptoms of P0299

Check-engine light on
Noticeable loss of power, especially under load
Reduced-power / limp mode
Whistling or whooshing noise from a boost leak
Slower acceleration when merging or towing

Is it safe to drive with P0299?

Usually yes for gentle driving, but avoid towing and hard acceleration until it is fixed. The main risk is not having the power you expect when merging or passing, especially if the engine drops into limp mode. If the leak is on the intake side ahead of the turbo, it can also let unfiltered air reach the turbocharger, so get the intake and charge-air system inspected within days, not months.

What the P0299 fix costs

Fix	DIY parts	At a shop
Replace an intercooler hose or coupler	$20 - $150	$100 - $400
Replace the boost control solenoid	$40 - $150	$150 - $400
Repair or replace the wastegate actuator	$100 - $400	$300 - $900
Replace the turbocharger	$500 - $1,800	$1,200 - $3,000

Ranges are rounded and for the US market only - actual price depends on region, shop labor rates, and the exact make and model.

Parts that commonly fix P0299

Intercooler / boost hose - Cause #1: a split boost hose or loose coupler leaking charge air
Hose clamps - A clamp that walked off a boost pipe is the cheapest underboost fix there is
Vacuum gauge - Checks the vacuum supply to a vacuum-operated wastegate actuator
OBD-II scanner - Reads and clears codes, and shows live data so you fix the cause rather than the symptom

Most of these open an Amazon search - add your year, make and model, because most of these parts are fitment-specific. A few link straight to the exact tool or part we have verified, because it fits any vehicle.

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What P0299 actually means

P0299 means a turbocharged or supercharged engine is making less boost than the PCM commanded. The engine still runs, but it may feel flat, go into reduced-power mode, or hesitate under load. The most common cause is a boost leak - a split intercooler hose, a popped coupler, or a loose clamp between the turbo and the throttle body - followed by wastegate or actuator problems and, less often, a worn turbocharger. P0299 is frequently reported on Ford EcoBoost, VW and Audi TSI engines, and Duramax and Cummins diesels, but the diagnosis follows the same logic on any boosted engine.

How to diagnose P0299 step by step

Step 1: Inspect every boost hose and coupler With the engine off, follow the charge-air path from turbo to intercooler to throttle body. Look for split rubber couplers, oily residue at joints, loose or missing clamps, and cracked plastic pipes. A hose that has blown off or split is the most common P0299 cause. If you find one, repair it and retest.
Step 2: Pressure or smoke test the charge-air system Small boost leaks hide at idle and open under pressure. Cap the intake at the turbo inlet side and pressurize the charge pipes gently, or smoke-test them, and listen or watch for escaping air. If the system cannot hold pressure, find and fix the leak before touching the turbo.
Step 3: Compare desired and actual boost on live data Log commanded and actual boost pressure during a firm pull in a safe place. If actual lags desired only at high load, suspect a leak or wastegate. If boost is low everywhere, look at the wastegate control and the turbo itself. A boost sensor reading that makes no sense at key-on suggests a sensor or wiring fault.
Step 4: Check the wastegate and its actuator A wastegate stuck open bleeds exhaust around the turbine and caps boost. On vacuum-controlled systems, check the actuator holds vacuum and the lines are intact; on electronic actuators, check for related codes and command it with a capable scan tool. If the wastegate does not move as commanded, repair that before condemning the turbo.
Step 5: Check the intake and exhaust for restrictions A collapsed intake duct, a badly clogged air filter, or a restricted exhaust or diesel particulate filter can all limit boost. Inspect the filter and ducts, and on diesels check for DPF-related codes. Clear any restriction and retest before moving on.
Step 6: Inspect the turbocharger for wear With the intake pipe off and the engine off, check the compressor wheel for damage and excessive shaft play, and look for heavy oil in the intake. Only if the charge system holds pressure, the wastegate works, and boost is still low should you consider replacing the turbocharger.

The most common P0299 misdiagnosis

Replacing a turbocharger for P0299 when the real problem was a split coupler or loose clamp is the expensive mistake this code is known for. A new turbo will underboost exactly like the old one if the charge air is escaping downstream of it.

Tools you need for P0299

OBD-II scanner with live data - Logging desired versus actual boost tells you where in the rev range the shortfall happens.
EVAP and vacuum smoke tester - Smoke finds small charge-air leaks that are invisible at idle.
Vacuum gauge - Checks that a vacuum-operated wastegate actuator holds vacuum.

Parts you may need for P0299

Intercooler boost hose or coupler - Split couplers and hoses are the most common cause of underboost. Match the part to your engine.
Boost hose clamps - A loose or failed clamp lets a coupler blow off under load; cheap to replace while you are in there.
Wastegate actuator or boost control solenoid - If the wastegate is not responding to commands, this is the next part after leaks are ruled out.

P0299: DIY or pay a shop?

Difficulty: Moderate. Time: 0.5 - 6 hours. DIY parts: $20 - $1500. Shop total: $100 - $3000.

Finding and fixing a boost leak is very DIY-friendly and is the likeliest fix, so do that part yourself. Wastegate adjustment and turbocharger replacement are a different level of job - they involve oil and coolant lines, exhaust fasteners that seize, and on many engines significant disassembly, so most owners hand those to a shop.

How to stop P0299 coming back

Keep oil changes on time on a turbocharged engine. Turbocharger bearings depend on clean oil, and short or overdue oil changes are a known path to turbo wear. Inspecting the boost hoses whenever the air filter is serviced also catches couplers before they split. Track this car in ServiceSage and get reminders for the oil changes and air filter services that keep a turbocharged engine making full boost. Track this maintenance free.