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
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U0401.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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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.