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Home / DTC / U0336 — Software Incompatibility with Restraints Control Module

U0336 — Software Incompatibility with Restraints Control Module

Detailed page for trouble code U0336.

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Code

U0336

HYUNDAI U — Network/User

Software Incompatibility with Restraints Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Restraints Control Module (RCM/SRS) firmware version mismatch or corrupted firmware
  • Incomplete or failed software update/programming
  • Incompatible replacement module or non‑OEM module installed
  • Network communication errors causing corrupted messages on the CAN bus
  • Battery voltage problems during programming or operation
  • Faulty connectors, damaged wiring, or corrosion on SRS harness

Symptoms

  • SRS/Airbag warning lamp illuminated on dash
  • Diagnostic tool reports U0336 and possibly other network/communication U‑codes
  • Vehicle may fail safety inspections related to SRS readiness
  • Some SRS functions (airbags, seatbelt pretensioners) may be disabled or placed in a fault state
  • Inability to clear fault until software mismatch is resolved
  • Possible loss of related module communication or spurious faults in other modules

What to check

  • Read and record all DTCs and freeze frame data from the RCM and other modules using an OEM‑level scanner
  • Check vehicle history: recent module replacement, programming, or ECU updates
  • Verify battery voltage is within specification (fully charged) and charging system health before programming
  • Inspect connectors and wiring for corrosion, bent pins, damage or poor contacts at RCM and related modules
  • Check CAN bus health: proper termination resistances and no short to voltage/ground
  • Compare software/part numbers: read RCM hardware ID (part number), software/firmware version and compare to OEM database

Signal parameters

  • CAN message IDs and frequencies for SRS network (compare against OEM spec)
  • Module part number and software/firmware version strings (SW part no., SW level, calibration ID)
  • Checksum/CRC values (if provided by OEM) or reflash status flags
  • Supply voltage to RCM (battery voltage during communication/programming)
  • Number of failed message attempts or bus error counters
  • Time/date of last successful programming (if available)

Diagnostic algorithm

  1. Safely disable the vehicle’s SRS power per OEM procedures before disconnecting SRS components or connectors (follow wait times after battery isolation).
  2. Connect an OEM‑capable diagnostic tool and read/record all stored codes and freeze‑frame data from the Restraints Control Module and related modules (BCM, ECM). Note any other U‑codes.
  3. Verify battery state of charge and charging system. Recharge or maintain battery with a stable power source during programming/reflash. Use a battery maintainer if required.
  4. Inspect wiring and connectors at the RCM and related modules for damage, corrosion, or loose pins. Repair any physical faults and retest communication.
  5. Use the OEM tool to read the RCM software/firmware and hardware IDs. Compare software levels to vehicle build data and OEM published calibration levels. Confirm VIN and regional calibration match the installed module.
  6. If software level is incorrect or corrupted, perform an OEM reflash/firmware update or full programming of the RCM using the manufacturer’s procedures and an approved scan tool. Ensure stable power during the entire operation.
  7. After programming, clear all codes and perform key on/engine start cycles as required. Verify that the SRS lamp extinguishes and that the OEM tool reports the module as OK and showing correct software level. Check for any returned codes.
  8. If RCM reprogramming fails or if the module does not accept correct calibration, verify other modules’ software levels (BCM/ECM). Reprogram any modules that are out of date if OEM guidance requires coordinated updates.
  9. If communication still fails after software updates and wiring checks, consider replacing the RCM with a correctly programmed/original equipment module and program to vehicle per OEM steps. Preserve safety: follow SRS handling and disposal rules.
  10. Document all steps, software versions, and final test results. If uncertain, escalate to dealer or OEM technical support.

Likely causes

  • RCM was replaced with a module that has different software or country/region calibration
  • A previous reflash failed or was interrupted (low battery, comms error)
  • BCM/ECM received an update and now sends messages that the RCM does not recognize
  • Corroded connector or poor ground producing intermittent communication errors
  • Aftermarket device or incorrect part installed that alters network traffic

Fault status

⚠️ Status
Restraints Control Module reports software incompatibility or unexpected data. Module communication exists but firmware/calibration does not match expected values; reprogramming or correct replacement module may be required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0300
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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