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U3003 on HONDA ACCORD

Severity
Medium
NHTSA Reports
5
Most Affected
2018

What U3003 Means on Your HONDA ACCORD

Real HONDA ACCORD Owner Reports (Source: NHTSA Complaints Database)

"Began getting several alerts, when taken in to get a diagnosis I received the following error codes P0301, P0304, P0301, P0300, U0401-68 & U3003-16."

— 2018 HONDA ACCORD owner • ELECTRICAL SYSTEM,UNKNOWN OR OTHER,ENGINE • Filed 12/04/2023

"Ebb- electric brake booster u3003-16 battery voltage circuit voltage below threshold it has a new battery, it shouldn’t be having this issue. this is dangerous for my entire family."

— 2018 HONDA ACCORD owner • SERVICE BRAKES • Filed 11/30/2021

"U3003-16 battery voltage circuit voltage below threshold issue # 17 with my accord please have the manufacturer fix this issue."

— 2018 HONDA ACCORD owner • ELECTRICAL SYSTEM • Filed 11/30/2021

"U3003-17 battery voltage circuit voltage above threshold issue # 18 with my accord."

— 2018 HONDA ACCORD owner • ELECTRICAL SYSTEM • Filed 11/30/2021

"U3003-16 electric parking brake control unit power source circuit(+b) low voltage. issue # 20 on my accord. please have the manufacturer fix this issue asap."

— 2018 HONDA ACCORD owner • ELECTRICAL SYSTEM • Filed 11/30/2021

Data from NHTSA Vehicle Complaints Database. All reports are filed by vehicle owners directly with the U.S. Department of Transportation.

Common Causes of U3003 on HONDA ACCORD

60%
20%
20%

Percentages based on NHTSA complaint component analysis for this vehicle.

Complaint Trend by Year

2018
5

What To Do Next

  1. 1
    Check for recalls on YOUR VIN

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if your vehicle is covered.

  2. 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. 3
    Compare repair quotes

    Get 2-3 quotes. Dealer vs independent shop prices often differ 30-50% for the same repair.

U3003 on Other Vehicles

Data sourced from the National Highway Traffic Safety Administration (U.S. Department of Transportation) and the SAE J2012 OBD-II standard. Code definitions follow the SAE J2012 / ISO 15031-6 standard. Owner reports are filed directly with NHTSA by vehicle owners. This information is provided for educational purposes only and should not replace professional automotive diagnosis. Always consult a qualified mechanic for vehicle repair decisions.

Last updated: March 2026