Code
B285300
HYUNDAI
B — Body
No HUD Flection Correction(HUD Not Warped)
Views:
UK: 10
EN: 12
RU: 9
AI status
Completed
Completed
100%
Causes
- HUD flection/warp sensor not detecting expected condition
- HUD control module software or calibration routine error
- Faulty or loose wiring / connectors to the HUD unit
- Blown fuse or loss of power / ground to HUD
- Incorrect or incomplete HUD installation or mechanical interference
- CAN bus or module communication fault
Symptoms
- HUD image misalignment, image skew or distortion
- HUD image not appearing in correct position on windshield
- Inability to complete HUD calibration procedure
- Warning or message on cluster/AVN related to HUD or calibration
- Intermittent HUD operation or blank HUD
What to check
- Confirm exact DTC and freeze frame data with OEM scan tool
- Visual inspection of HUD assembly, mounting, and windshield area for damage
- Inspect HUD connector and wiring harness for corrosion, bent pins, or damage
- Verify fuses and chassis/engine bay power circuits for HUD (check for 11–14 V at supply)
- Confirm CAN/communication lines to HUD module are active and without errors
- Attempt manufacturer-recommended HUD calibration routine and observe results
Signal parameters
- Supply voltage to HUD: ~11–14 V with ignition ON
- Ground continuity: near 0 Ω (solid ground)
- CAN/CAN-FD network: active traffic between HUD module and BCM / AVN
- HUD self-test/calibration status flags: expected status codes per OEM tool (pass/fail)
- Calibration command response: HUD should acknowledge calibration command
Diagnostic algorithm
- Read and record the DTC with an OEM diagnostic tool, note freeze frame and any related codes (especially CAN or body module faults).
- Clear the code then attempt the OEM HUD calibration procedure; observe whether the code returns and note any error messages shown by the tool.
- Perform a visual inspection: check HUD assembly mounting, lens/windshield interface, and look for mechanical warp or obstruction that would prevent proper projection.
- Inspect connector and wiring: unplug HUD connector, inspect pins for corrosion/damage, check for secure mating, wiggle harness while monitoring for intermittent faults.
- Measure power and ground at the HUD connector with a DVOM: verify ~12 V on power circuit with ignition ON and solid ground continuity.
- Check communication: use a scan tool to monitor CAN messages to/from the HUD module and look for bus-off or missing-message faults; inspect related modules (AVN, BCM) for communication errors.
- If wiring, power, ground and communications are OK, check for available software updates or re-flash/reset procedure for the HUD control module per OEM service information.
- If module still fails self-test, consider replacement of HUD module or assembly. After replacement, perform full OEM calibration and confirm correct operation before clearing codes.
- After repairs, re-run calibration and road-check (if required) to verify HUD alignment and that the DTC does not return.
Likely causes
- HUD module failed self-check or returned unexpected status (reports 'not warped' when correction expected)
- Connector corrosion or pin damage at HUD assembly
- Power supply (battery/fuse/ignition-switched 12V) intermittent or missing
- Software mismatch or need for module re-flash/initialization after replacement
- Calibration not performed after windshield/cluster/HUD replacement
Fault status
Status
HUD flection correction not performed — HUD reports 'not warped' or diagnostic routine unable to complete; calibration/communication or hardware issue suspected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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