U0566 code meaning
Invalid Data Received From Image Processing Sensor A
What U0566 means
At GM, image processing sensor A is the front camera behind the windshield; its partner U0265 is called Front View Camera – Windshield in GM bulletins. GM's 2025 OBD tables show how U0566 is detected: the brake module and the EOCM3 driver-assist controller check rolling counters, checksums and message authentication on the camera's frames. EOCM3 sets it when 3 of 4 messages fail within about 3 seconds, the brake module after 3 counter errors in a window of 16, both only at 9–16 V and as Type C without MIL; adaptive cruise is switched off. On 2020 Cadillac CT4 and CT5 a resetting camera set U0566 with U0265 and P25A2, cut driver and steering assist, and P25A2 could light the MIL. Reprogramming the camera came first.
U0566 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0566
- Service Driver Assist or Steering Assist Reduced message
- Adaptive cruise and automatic braking functions unavailable
- MIL possible only through accompanying brake-module code P25A2
Common causes of U0566
- Most likelyWindshield camera software resets or sends faulty protection values (GM remedy is reprogramming)
- PossibleFront camera internally faulty when the fault recurs often (GM then replaces it)
- Less likelySupply voltage dips or bus disturbances during start
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Image processing sensor a
What each part of U0566 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 66 | The exact fault in that area. |
What to do next
- Note U0566 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0566
What does U0566 mean?
U0566 means "Invalid Data Received From Image Processing Sensor A". At GM, image processing sensor A is the front camera behind the windshield; its partner U0265 is called Front View Camera – Windshield in GM bulletins. It is a generic code, so it means the same on every make.
Is it safe to drive with U0566?
U0566 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0566 fail an emissions test?
U0566 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0566 to fix?
Difficulty: hard. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U0566 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.