U0533 code meaning
Invalid Data Received From Side Obstacle Detection Control Module A
What U0533 means
Side obstacle detection modules are the corner radars behind the rear bumper that watch blind spots and crossing traffic. GM and Ford give letter A to the left unit: the 2011 Saab 9-5 code list names U0232 for the left side-object module, and Ford bulletin 24-2180 (Expedition/Navigator 2022-2024) logs U0232 in Ford's IPMA camera module together with faults of the left radar. Toyota instead labels U0232 as the slave sensor on the Tacoma. U0533 itself appears in no published manufacturer text; it would be set when the left module's frames reach the receiver but carry invalid content. The Ford case shows that mud, ice or corrosion at the sensor trigger false Blind Spot Not Available warnings. Blind spot and cross traffic alerts then switch off. U0232 is total loss, U0534 the right unit.
U0533 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0533
- Blind spot monitoring unavailable message
- Left mirror warning indicator inoperative
- Rear cross traffic alert switched off
Common causes of U0533
- Most likelyMud, ice or damage at the left rear radar, bracket or bumper cover
- PossibleWater or corrosion in the radar connector or harness
- PossibleRadar module software or configuration fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Side obstacle detection module a
What each part of U0533 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 33 | The exact fault in that area. |
What to do next
- Note U0533 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 U0533
What does U0533 mean?
U0533 means "Invalid Data Received From Side Obstacle Detection Control Module A". Side obstacle detection modules are the corner radars behind the rear bumper that watch blind spots and crossing traffic. It is a generic code, so it means the same on every make.
Is it safe to drive with U0533?
U0533 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0533 fail an emissions test?
U0533 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 U0533 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0533 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.