Damaged, corroded, or loose wiring and connector pins at the front distance sensor or its harness; A front distance sensor that has failed internally or has a cracked, contaminated, or obstructed lens; A sensor that is misaligned or has been knocked out of position by a minor impact or bumper repair; Low or unstable battery voltage or a poor ground affecting the sensor module's communication; A software or calibration issue in the supervising module after battery replacement or body work; Water intrusion into the sensor connector or module causing intermittent data corruption; A fault in the sensor's own control module or its power and ground supply

DTC codes / U04xx · Invalid data received from a module / U0433

U0433Invalid Data Received From Front Distance Range Sensor - Single Sensor or Center

U0433 means the module that supervises the front distance range sensor, often the parking assist or forward collision system, received data it considers invalid from a single sensor or the center sensor in that array. The supervising module sets this communication code when the sensor's messages are missing, out of range, or fail an internal plausibility check, so the fault is in the data link or sensor rather than in the object detection itself.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaInvalid data received from a module

Symptoms you may notice

A parking assist, forward collision, or adaptive cruise warning light or message on the dash
The distance warning or automatic braking feature becomes unavailable or disabled
Parking sensors stop beeping or give erratic, constant, or false alerts
A chime or message appears each time the vehicle is started
Often no symptoms besides the warning light, with the vehicle driving normally
The system may default to off and require a restart to attempt re-enablement

Common causes, most likely first

Damaged, corroded, or loose wiring and connector pins at the front distance sensor or its harness
A front distance sensor that has failed internally or has a cracked, contaminated, or obstructed lens
A sensor that is misaligned or has been knocked out of position by a minor impact or bumper repair
Low or unstable battery voltage or a poor ground affecting the sensor module's communication
A software or calibration issue in the supervising module after battery replacement or body work
Water intrusion into the sensor connector or module causing intermittent data corruption
A fault in the sensor's own control module or its power and ground supply

How to diagnose and fix it

Scan all modules for stored and pending codes, then record freeze-frame data and check for related communication codes before clearing anything
Inspect the front distance sensor and its connector for physical damage, corrosion, water intrusion, and secure mounting
Check battery voltage and the sensor's power and ground circuits with a multimeter under load
Perform a wiggle test on the sensor harness while watching live data to expose intermittent wiring faults
Verify the sensor is correctly aligned and its lens is clean and unobstructed
If wiring and power are good, substitute a known-good sensor of the same part type and recheck data
After repair, clear codes and perform any required calibration or relearn procedure for the front distance system

What the invalid data code really means

U0433 is a communication and data-validity code, so the sensor may still physically detect objects while its messages are rejected by the supervising module.
A common miss is replacing the sensor when the real fault is a chafed harness behind the bumper or a corroded pin that only acts up in wet weather.
Body work, bumper replacement, or a minor parking bump often leaves the sensor bracket bent just enough to fail the module's plausibility check without any visible damage.
Low battery voltage after a jump start or long storage can set this code on vehicles whose modules boot before the sensor is ready, and it may not return after clearing.
The code does not confirm the sensor is dead, so always check live data and the sensor's power and ground before condemning the part.

Can I keep driving with U0433?

The vehicle remains safe to drive because the fault disables a driver-assist feature rather than a primary control system, but do not rely on forward collision warning, automatic braking, or parking assist until it is repaired. Avoid driving in heavy traffic or tight parking situations where those aids are expected to intervene.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.