U0401 on 2022-2024 Ford Maverick — Invalid Data Received From ECM/PCM "A"
1 vehicles · 1 makes
Most Reported On
U0401 is an OBD-II diagnostic trouble code meaning “Invalid Data Received From ECM/PCM "A".” This network code is set when a module on the data bus receives implausible or invalid data from engine/powertrain control module "A". It means the modules are communicating, but the information coming from the ECM/PCM does not make sense, indicating a data integrity or module problem rather than a total loss of communication. Because powertrain data is shared widely, this can disable systems like traction control, illuminate the check engine light, or even prevent starting. Diagnosis focuses on the ECM/PCM, its wiring, sensor inputs, and the bus. This code is most commonly reported on 2022-2024 Ford Maverick.
Common Causes
Diagnostic Tools
To diagnose U0401, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does U0401 mean?
U0401 stands for "Invalid Data Received From ECM/PCM "A"." This network code is set when a module on the data bus receives implausible or invalid data from engine/powertrain control module "A". It means the modules are communicating, but the information coming from the ECM/PCM does not make sense, indicating a data integrity or module problem rather than a total loss of communication. Because powertrain data is shared widely, this can disable systems like traction control, illuminate the check engine light, or even prevent starting. Diagnosis focuses on the ECM/PCM, its wiring, sensor inputs, and the bus.
What are the most common causes of U0401?
The most common causes of U0401 are: Faulty ECM/PCM or internal software fault, Damaged, shorted, or corroded ECM/PCM wiring/connectors, One or more faulty sensors feeding the ECM/PCM, Low system or battery voltage / weak battery, Communication bus wiring fault, Poor ground or power supply to the module, Outdated module software requiring update. The specific cause varies by vehicle.
How much does it cost to fix U0401?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U0401?
Au7o has documented U0401 across 1 vehicle models from 1 manufacturers: Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.