Ask Andy AIP0299 Turbocharger/Supercharger A Underboost Condition
What it means, what causes it, and what it costs to fix.
What P0299 means
The turbo or supercharger isn't making the boost pressure the computer requested.
Can I drive with P0299?
Severity: Medium. Fix soon so it doesn't turn into something bigger.
Drivable in reduced power. Don't push it hard, and avoid towing until it's fixed.
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Ask Andy about P0299Symptoms
- Loss of power
- Limp mode
- Whistling or hissing under acceleration
- Check engine light
Common causes
Most likely first.
- Boost leak: cracked intercooler pipe, loose clamp, or split hose
- Faulty wastegate or wastegate actuator
- Bad boost control solenoid
- Failing turbocharger
- Clogged air filter or restricted exhaust
How to diagnose P0299
- Inspect intercooler pipes and couplers for oil residue and splits, the most common culprit.
- Smoke- or pressure-test the intake tract.
- Check wastegate actuator movement.
- Inspect the turbo for shaft play.
Tip: most US auto parts stores will read your codes for free.
Repair costs
| Boost hose or clamp | $30–$300 |
| Boost control solenoid | $100–$300 installed |
| Wastegate actuator | $300–$900 installed |
| Turbocharger | $1,500–$4,000+ installed |
Typical US prices. Your vehicle, region, and shop rates will change these.
P0299 FAQ
What does P0299 mean?
P0299 means "Turbocharger/Supercharger A Underboost Condition." The turbo or supercharger isn't making the boost pressure the computer requested.
Can I drive with a P0299 code?
Drivable in reduced power. Don't push it hard, and avoid towing until it's fixed.
What is the most common cause of P0299?
The most common cause is: Boost leak: cracked intercooler pipe, loose clamp, or split hose. Other causes include faulty wastegate or wastegate actuator and bad boost control solenoid.
How much does it cost to fix P0299?
Typical repairs run about $30 to $4,000 in the US, depending on the cause. Boost hose or clamp: $30–$300.
Still not sure what's wrong?
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