U0313

Code

HYUNDAI U — Network/User

Software Incompatibility with Battery Energy Control Module B

Brand: HYUNDAI

Type: U — Network/User

Views: UK: 11 EN: 16 RU: 15

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Software version mismatch after partial or failed reflash/update
Replacement BECM B fitted with incorrect or out-of-date software
Incomplete or interrupted programming session
Incompatible calibration files used during dealer/service reprogramming
Corrupted module software or memory
CAN/CAN-FD bus communication errors or low bus voltage causing corrupted messages

Symptoms

Battery management warning or MIL on dash
Reduced charging/driveability or limp-home mode related to battery control
Inaccurate state-of-charge or battery health messages
Intermittent loss of functions that depend on battery data
Other modules reporting communication faults or related DTCs
Possible no-start or limiting of hybrid/EV systems (if present)

What to check

Read and record all stored U- and P-codes and freeze frame data with a full OEM-capable scanner
Check software/firmware part numbers and calibration IDs for BECM B and related modules
Review vehicle service history for recent module replacement or reflashes
Inspect BECM B connectors, power, and ground circuits for corrosion, damage, or poor contact
Check vehicle bus voltages and termination resistance for CAN/CAN-FD (look for shorts, opens, or noise)
Verify battery state of charge and auxiliary battery voltage during key-on and programming

Signal parameters

BECM B software/calibration ID (SW Part/Cal ID) reported over diagnostic session
CAN message identifiers and message frequency for BECM B broadcasts
Battery pack voltage and pack current messages
State of charge (SOC) and pack temperature messages
Module respond-to-scan-tool status and DTC response data
Bus voltage levels and error counters (CAN TX/RX error counts)

Diagnostic algorithm

Connect an OEM-level diagnostic tool. Read and save codes from all modules and capture freeze frame and module software IDs.
Check for related communication codes (e.g., lost communication U0100, U0121) indicating network issues. Note any coincident codes.
Inspect connectors, wiring, fuses, and grounds to BECM B. Repair any physical faults before attempting software work.
Verify battery voltages and ensure stable power supply. Recharge or replace auxiliary battery if below specification.
Compare software/calibration IDs of BECM B with manufacturer's required IDs for the vehicle VIN. Check TSBs and update advisories.
If software is incorrect or out-of-date, reprogram BECM B to the correct OEM calibration using the manufacturer-approved programming tool and procedure. Ensure stable power throughout.
After successful programming, clear codes and perform a functional test or test drive while monitoring BECM messages and related module communication.
If reprogramming fails or the code returns with correct software, consider re-flashing related master modules (controller-to-controller compatibility) or replacing BECM B and programming the replacement with correct VIN-specific software.
If module replacement is performed, ensure all modules are at compatible software levels and perform any required vehicle configuration or relearn procedures.
Document all software levels, repair steps, and parts replaced for warranty or future reference.

Likely causes

Module was recently replaced or reprogrammed and not flashed to the vehicle's required software level
Programming job failed or was interrupted (power loss during reflash)
Vehicle received an OEM update for other control modules and BECM B was not updated to the matching calibration
Faulty connector/power supply to BECM B leading to corrupted software or communications

Fault status

⚠️ Status

Stored when BECM B reports a software/calibration mismatch or incompatible firmware with the vehicle network or other modules; indicates required reprogramming or module compatibility issue.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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U0313 — Software Incompatibility with Battery Energy Control Module B