U0401 on HONDA ACCORD — Invalid Data Received From ECM/PCM A

Q: "What does U0401 mean on a HONDA ACCORD?"

"U0401 indicates: Invalid Data Received From ECM/PCM A. This is a network communication code. 3 HONDA ACCORD owners have reported this to NHTSA."

Q: "What are the most common causes of U0401 on HONDA ACCORD?"

"Based on 3 NHTSA reports, the most commonly cited components are: Power Train,Forward Collision Avoidance,Lane Departure, Electrical System,Unknown Or Other,Engine, Vehicle Speed Control,Forward Collision Avoidance. These percentages are based on the component field in owner complaints."

Q: "Is U0401 serious on my HONDA ACCORD?"

"Of 3 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 U0401?"

"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 U0401 Means on Your HONDA ACCORD

U0401 is a diagnostic trouble code indicating: Invalid Data Received From ECM/PCM A. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

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

Real HONDA ACCORD Owner Reports

Source: NHTSA Complaints Database

"The issue first appeared during my initial test drive before purchase in 2019. The salesman stated it was a low-battery issue from the car sitting on the lot. Since then, the same problem has recurred multiple times."

— 2018 HONDA ACCORD owner · POWER TRAIN,FORWARD COLLISION AVOIDANCE,LANE DEPARTURE · Filed 06/21/2019

"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

"CMS - collision mitigation system stops working completely. 2 warning lamps on dash. Cruise control completely inoperative."

— 2020 HONDA ACCORD owner · VEHICLE SPEED CONTROL,FORWARD COLLISION AVOIDANCE · Filed 05/02/2022

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

📊 Complaint Trend by Model Year

2

'18

1

'20

Common Causes on HONDA ACCORD

Based on NHTSA complaint component analysis for this vehicle.

POWER TRAIN,FORWARD COLLISION AVOIDANCE,LANE DEPARTURE 33.3%

ELECTRICAL SYSTEM,UNKNOWN or OTHER,ENGINE 33.3%

VEHICLE SPEED CONTROL,FORWARD COLLISION AVOIDANCE 33.3%

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 U0401 mean on a HONDA ACCORD? ▾

U0401 indicates: Invalid Data Received From ECM/PCM A. This is a network communication code. 3 HONDA ACCORD owners have reported this to NHTSA.

What are the most common causes of U0401 on HONDA ACCORD? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Power Train,Forward Collision Avoidance,Lane Departure, Electrical System,Unknown Or Other,Engine, Vehicle Speed Control,Forward Collision Avoidance. These percentages are based on the component field in owner complaints.

Is U0401 serious on my HONDA ACCORD? ▾

Of 3 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 U0401? ▾

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.