U0401 on FORD FOCUS — Invalid Data Received From ECM/PCM A

Q: "What does U0401 mean on a FORD FOCUS?"

"U0401 indicates: Invalid Data Received From ECM/PCM A. This is a network communication code. 2 FORD FOCUS owners have reported this to NHTSA."

Q: "What are the most common causes of U0401 on FORD FOCUS?"

"Based on 2 NHTSA reports, the most commonly cited components are: Power Train,Service Brakes, Power Train,Engine. These percentages are based on the component field in owner complaints."

Q: "Is U0401 serious on my FORD FOCUS?"

"Of 2 NHTSA reports for this code on FORD FOCUS, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my FORD FOCUS 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 FORD FOCUS

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.

2 FORD FOCUS owners have reported this issue to NHTSA across model years 2014. Most reports come from the 2014 model year. The most commonly reported component is Power Train,Service Brakes (50.0% of reports).

Real FORD FOCUS Owner Reports

Source: NHTSA Complaints Database

"1) power train system- P090C AND P090C-00 clutch b actuator circuit low causing transmission to slip."

— 2014 FORD FOCUS owner · POWER TRAIN,SERVICE BRAKES · Filed 07/26/2025

"The contact owns a 2014 Ford Focus. The contact stated that on numerous occasions while shifted into reverse(R), the vehicle failed to respond. The contact also stated that while shifted into reverse(R), the RPM increased and the engine revved while the brake pedal was depressed."

— 2014 FORD FOCUS owner · POWER TRAIN,ENGINE · Filed 04/12/2022

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

📊 Complaint Trend by Model Year

2

'14

Common Causes on FORD FOCUS

Based on NHTSA complaint component analysis for this vehicle.

POWER TRAIN,SERVICE BRAKES 50%

POWER TRAIN,ENGINE 50%

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 FORD FOCUS? ▾

U0401 indicates: Invalid Data Received From ECM/PCM A. This is a network communication code. 2 FORD FOCUS owners have reported this to NHTSA.

What are the most common causes of U0401 on FORD FOCUS? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Power Train,Service Brakes, Power Train,Engine. These percentages are based on the component field in owner complaints.

Is U0401 serious on my FORD FOCUS? ▾

Of 2 NHTSA reports for this code on FORD FOCUS, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my FORD FOCUS 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.