P0299 on HONDA ACCORD — Turbocharger/Supercharger A Underboost Condition

Q: "What does P0299 mean on a HONDA ACCORD?"

"P0299 indicates: Turbocharger/Supercharger A Underboost Condition. This is a fuel injection code. 4 HONDA ACCORD owners have reported this to NHTSA."

Q: "What are the most common causes of P0299 on HONDA ACCORD?"

"Based on 4 NHTSA reports, the most commonly cited components are: Engine,Fuel/Propulsion System, Power Train,Electrical System,Engine, Electrical System,Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0299 serious on my HONDA ACCORD?"

"Of 4 NHTSA reports for this code on HONDA ACCORD, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my HONDA ACCORD shows P0299?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0299 Means on Your HONDA ACCORD

P0299 is a diagnostic trouble code indicating: Turbocharger/Supercharger A Underboost Condition. This code relates to the fuel injection system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

4 HONDA ACCORD owners have reported this issue to NHTSA across model years 2018-2020. Most reports come from the 2018, 2019 model years.

Real HONDA ACCORD Owner Reports

Source: NHTSA Complaints Database

"While accelerating uphill approximately 65 mph the car suddenly started to shutter and slow down to 35 mph. I forced me to move rapidly over to the right lane on a busy highway almost getting hit by a semi truck. Luckily I was able move to the shoulder and park the vehicle."

— 2018 HONDA ACCORD owner · ENGINE,FUEL/PROPULSION SYSTEM · Filed 06/13/2025

"Scanned for codes. Found P0303, P0299, and P2243 stored. Found coolant entering cylinder 3. Found excessive play in the waste gate rod and found A/F sensor is not responding. Needs head gasket. Vehicle starts up and runs rough. All alerts on alerts on dash on cust states check engine light on."

— 2018 HONDA ACCORD owner · POWER TRAIN,ELECTRICAL SYSTEM,ENGINE · Filed 02/17/2025

"The turbo! Code P0299! Hundreds of thousands of Americans going through the same issue all their lights are flashing on their dashboard with these 1."

— 2019 HONDA ACCORD owner · ELECTRICAL SYSTEM,ENGINE · Filed 03/05/2026

"Subject: Turbocharger Underboost – Safety Concern on 2020 Honda Accord EX-L I am reporting a serious safety issue with the turbocharger system on my 2020 Honda Accord EX-L with the 1.5L turbocharged engine."

— 2020 HONDA ACCORD owner · ENGINE · Filed 04/20/2025

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

2

'18

1

'19

1

'20

Common Causes on HONDA ACCORD

Based on NHTSA complaint component analysis for this vehicle.

ENGINE,FUEL/PROPULSION SYSTEM 25%

POWER TRAIN,ELECTRICAL SYSTEM,ENGINE 25%

ELECTRICAL SYSTEM,ENGINE 25%

ENGINE 25%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0299 mean on a HONDA ACCORD? ▾

P0299 indicates: Turbocharger/Supercharger A Underboost Condition. This is a fuel injection code. 4 HONDA ACCORD owners have reported this to NHTSA.

What are the most common causes of P0299 on HONDA ACCORD? ▾

Based on 4 NHTSA reports, the most commonly cited components are: Engine,Fuel/Propulsion System, Power Train,Electrical System,Engine, Electrical System,Engine. These percentages are based on the component field in owner complaints.

Is P0299 serious on my HONDA ACCORD? ▾

Of 4 NHTSA reports for this code on HONDA ACCORD, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my HONDA ACCORD shows P0299? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.