U045D: Invalid Data Received From Automated Driving System Control Module A
What to do
Treat every driver assistance system as unavailable, and expect the car to have switched them off itself. That shutdown is deliberate — the systems that steer and brake refuse instructions they cannot verify, which is exactly what you would want them to do.
The car is otherwise unaffected: steering, brakes and engine are normal and entirely yours.
Mention any of these, because they are the usual causes and they sound harmless: a windscreen replacement, bumper or grille work, a low-speed knock while parking, or a recent software update at a dealer.
Do not agree to replacing this module early. It is one of the most expensive parts on the car, and the fault is usually in what it is being told — a camera or radar that needs recalibrating, or software that was updated on one module and not another.
What this code means
The automated driving module is talking, and what it is saying cannot be accepted. See U0400 for the family's framing.
The difference between this and U015C is the whole page, and it is not a technicality. A module that has gone silent is a module that has stopped acting. A module that is talking nonsense is one that is still issuing requests — and what this module requests is steering torque and braking.
So the code is evidence of the safety architecture working exactly as designed. The steering and braking modules do not simply obey; they check what they are asked to do against what the vehicle is actually doing, and they refuse a request that fails the check. A steering module that acted on an implausible demand is the failure nobody would survive explaining, which is why the refusal is built in and why the whole system shuts down rather than degrading gracefully.
The causes cluster around agreement rather than around parts. This module fuses camera, radar and vehicle motion into a single picture, and the sources have to agree within tight limits:
- Calibration. A camera or radar disturbed by windscreen replacement, bumper work or a parking knock aims slightly wrong, so its picture disagrees with the others.
- Software mismatch. These modules are updated as a set. One module updated and another not is a genuine and common cause of two systems describing the same road differently.
- An obstructed or misaligned sensor, which distorts one input rather than removing it.
- Supply and network faults, which corrupt what arrives rather than stopping it.
The corpus's standing warning applies here with unusual force. This module is among the most expensive on the vehicle, and the fault is very often in what it is being told rather than in the module. Calibration records and the codes stored in the camera and radar come first.
Likely causes
Start here
- Radar sensor not calibrated after front-end work · specialist
- Software updated on one module only · specialist
- Radar sensor out of alignment · specialist
Less common
- Damaged data bus wiring · moderate
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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