Is it safe to drive with a P0299 code?

Severity is medium. Address P0299 sooner rather than later — driving with an active check engine light can worsen the problem or void emissions warranties.

How much does it cost to fix P0299?

Repair costs for P0299 typically range from $30 to $2500 in the US, depending on the underlying cause. The most common fix is: Boost leak — split intercooler hose, cracked charge pipe (most common).

What are the symptoms of P0299?

Check engine light. Significant power loss. Limp mode when boost drops far below target. Hissing sound under load (boost leak). Slow turbo spool.

Check Engine Code

P0299

Turbocharger / Supercharger "A" Underboost

Severity: medium DIY difficulty: 3/5 Typical cost: $30–$2500

What P0299 means

P0299 sets when actual boost is consistently lower than commanded. Common on Ecoboost, Hyundai/Kia turbo, VAG TSI/TFSI engines.

Symptoms

Check engine light
Significant power loss
Limp mode when boost drops far below target
Hissing sound under load (boost leak)
Slow turbo spool

Likely causes (most common first)

Boost leak — split intercooler hose, cracked charge pipe (most common)
Failed wastegate actuator (stuck open)
Failed turbo (worn vanes / shaft play)
Stuck blow-off valve / diverter valve
Restricted air filter
Failed boost pressure sensor

Can I keep driving?

Medium — drivable but fix soon

Typical repair cost

DIY fixes can start near $30 (parts only). Shop repairs for P0299 typically run up to $2500 depending on the underlying cause and vehicle. Start with the most common cause — Boost leak — split intercooler hose, cracked charge pipe (most common) — before throwing parts at it.

Related codes

P0234P0235P00AFP0298

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