U045A code meaning
Invalid Data Received From Parking Assist Control Module A
What U045A means
Parking assist module A evaluates the ultrasonic sensors and in newer cars requests steering or braking for automated parking. U045A flags invalid data from it; U0159 is lost contact, U0544 covers module B. GM's brake module tables for the 2019 Cadillac XT4 (19OBDG03D) and 2020 (20OBDG03C) test counter and checksum of the parking brake request, a failure count rising by 2 per error and tripping at 3, within 0.2 s, Type C without MIL; the 2025 EBCM (25OBDG04B) wants 8 bad frames in 16. Ford's 2024 OBD summary rates U045A type 48 as non-MIL on cars with fully aided park assist. FCA TSB 08-011-15 (2014 Cherokee) fixes U045A-86 with new PAM software, Mercedes LI46.35-P-071804 lets E-Class steering units ignore U045A00, and Mazda's CX-5 camera logs U045A:68 after water entered sensor plugs. Park assist drops out.
U045A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U045A
- Park assist or automatic parking unavailable
- Parking sensor indicator flashing or false obstacle warnings
- Emergency braking or collision warning message
Common causes of U045A
- Most likelyParking assist module software needing an update
- PossibleWater or corrosion in ultrasonic sensor plugs or the bumper harness
- Less likelyReceiver storing the code as harmless history after a software change
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Parking assist module a
What each part of U045A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5A | The exact fault in that area. |
What to do next
- Note U045A 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 U045A
What does U045A mean?
U045A means "Invalid Data Received From Parking Assist Control Module A". Parking assist module A evaluates the ultrasonic sensors and in newer cars requests steering or braking for automated parking. It is a generic code, so it means the same on every make.
Is it safe to drive with U045A?
U045A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U045A fail an emissions test?
U045A 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 U045A to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U045A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.