U3003 on HONDA ACCORD — Battery Voltage

Q: "What does U3003 mean on a HONDA ACCORD?"

"U3003 indicates: Battery Voltage. This is a network manufacturer-specific code. 5 HONDA ACCORD owners have reported this to NHTSA."

Q: "What are the most common causes of U3003 on HONDA ACCORD?"

"Based on 5 NHTSA reports, the most commonly cited components are: Electrical System, Electrical System,Unknown Or Other,Engine, Service Brakes. These percentages are based on the component field in owner complaints."

Q: "Is U3003 serious on my HONDA ACCORD?"

"Of 5 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 U3003?"

"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 U3003 Means on Your HONDA ACCORD

U3003 is a diagnostic trouble code indicating: Battery Voltage. This code relates to the network manufacturer-specific system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

5 HONDA ACCORD owners have reported this issue to NHTSA across model years 2018. Most reports come from the 2018 model year. The most commonly reported component is Electrical System (60.0% of reports).

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

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

📊 Complaint Trend by Model Year

5

'18

Common Causes on HONDA ACCORD

Based on NHTSA complaint component analysis for this vehicle.

ELECTRICAL SYSTEM 60%

ELECTRICAL SYSTEM,UNKNOWN or OTHER,ENGINE 20%

SERVICE BRAKES 20%

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 U3003 mean on a HONDA ACCORD? ▾

U3003 indicates: Battery Voltage. This is a network manufacturer-specific code. 5 HONDA ACCORD owners have reported this to NHTSA.

What are the most common causes of U3003 on HONDA ACCORD? ▾

Based on 5 NHTSA reports, the most commonly cited components are: Electrical System, Electrical System,Unknown Or Other,Engine, Service Brakes. These percentages are based on the component field in owner complaints.

Is U3003 serious on my HONDA ACCORD? ▾

Of 5 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 U3003? ▾

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.