OBD-II trouble code
U045F: Invalid Data Received From Automated Driving System Interface Module 'A'
A module is receiving messages from the automated driving system (ADS) interface module 'A', but the data inside them is implausible or out of range. The link is alive; the content is wrong. Automated and hands-free driving features are disabled as a precaution — you drive manually until it's fixed.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $1,400
- DIY difficulty
- Shop recommended
What does U045F mean?
The automated driving system (ADS) interface module is the bridge between the ADS controller's driving decisions and the vehicle systems that carry them out — steering, braking, propulsion — and the sensors and networks that feed the system. Where the ADS control module decides what the car should do, the interface module translates and relays that between the automation and the rest of the vehicle, keeping the data consistent and time-aligned across networks. The 'A' designation identifies the primary interface module on vehicles that use more than one. U045F sets when a receiving module is still hearing from ADS interface module 'A', but the data in its messages is invalid — out of range, implausible, or in conflict with what other modules see. The link is alive; the content can't be trusted, which is the defining difference from a lost-communication code, where the module goes silent entirely.
Because the interface module sits directly in the path between the automation and the actuators, the system treats bad data from it as a reason to stand down. It disables the automated and hands-free driving features and returns full control to the driver with a takeover warning. The vehicle stays completely driveable under manual control — engine, transmission, brakes, and steering all respond normally — but the layer that lets the car share the driving task is switched off until the fault is resolved. As with the ADS controllers, treat any takeover request as immediate.
An interface module is heavily a relay, so its invalid-data codes are often secondary — the bad values may originate upstream in a sensor or another controller and simply pass through. Read companion codes first: a camera, radar, steering, brake, or another ADS code frequently names the real fault. Beyond that, the usual invalid-data causes apply: low system voltage or a poor ground; corroded or damaged connectors; chafed or damaged high-speed bus wiring between networks; an interrupted or mismatched software update; a module replaced without correct configuration; and, once those are ruled out, an internal module fault. When both interface modules 'A' and 'B' set invalid-data codes together, look for a shared power, ground, or bus cause.
Common causes
- Upstream sensor or controller fault passing implausible data through the interface
- Low system voltage, a weak battery, or a poor ground at the module
- Corroded, loose, or damaged connectors at the module
- Chafed or damaged high-speed bus wiring between networks
- Interrupted, mismatched, or corrupted ADS software update
- ADS interface module 'A' replaced without correct configuration
- Electrical noise or a marginal gateway corrupting relayed messages
- Internal ADS interface module 'A' fault
Symptoms
- Automated / hands-free driving features unavailable with a warning message
- Takeover request handing control back to the driver
- Driver-assistance warning light or 'service driver assist' message
- Multiple companion ADS, camera, radar, or chassis codes stored alongside U045F
- No change in how the vehicle starts, runs, or drives under manual control
Diagnostic steps
- 1.Read all stored codes first — U045F is often a secondary code, so a companion sensor, chassis, or ADS code usually names the real fault.
- 2.Address upstream faults (camera, radar, steering, brake, ADS controller) before focusing on the interface module.
- 3.Load-test the battery and verify charging voltage and the module's grounds.
- 4.Inspect connectors and high-speed bus/gateway wiring for corrosion, looseness, and chafing.
- 5.Confirm the last software update completed and check for available updates.
- 6.Check whether the module was recently replaced without configuration.
- 7.If upstream data, wiring, and software check out, suspect an internal module fault and verify with service data.
Repair cost
$100 – $1,400
Cost depends on the cause. Because U045F is often secondary, fixing the upstream fault frequently clears it. A software update/reflash is often $100-$300. Repairing a connector, ground, or wiring/gateway fault is typically $100-$450. Reprogramming or configuring the module after a replacement is usually $100-$300. ADS interface module replacement with programming is the higher end at roughly $700-$1,400. Diagnose and fix the source of the invalid data before replacing the interface module.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with module communication / can bus diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
Leave this one to a qualified shop. It typically involves emissions-critical components, refrigerant handling, or other work that requires manufacturer-grade tooling, training, or certification. DIY attempts often produce a more expensive problem than the original code.