U04AB

Code

Generic U — Network/User

Invalid Data Received From Hybrid/EV Battery Interface Control Module K

Brand: Generic

Type: U — Network/User

Views: UK: 27 EN: 43 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty or intermittent CAN/CAN-FD/ethernet network between battery interface module K and other ECUs
Corroded, loose, damaged or poorly seated connector(s) at the battery interface module or network junctions
Short to battery or chassis ground on CAN high/low wiring
Failed or failing battery interface control module (internal processor, memory, or transceiver)
Incorrect or mismatched software/firmware version between modules
Bus termination or wiring impedance problem (open/low/high resistance)

Symptoms

Hybrid/EV warning lamp or MIL illuminated
Reduced hybrid/EV performance or limp-home mode
Inability to start in EV/Hybrid mode or limited electric drive
Battery not charging or charging disabled
Incorrect state-of-charge, state-of-health, or cell data shown in scan tool
Intermittent drivability complaints that coincide with communications loss

What to check

Retrieve and record freeze frame data and complete CAN/bus network status with a capable scan tool
Check for additional U-codes or related hybrid/battery module codes stored in other modules
Visually inspect connectors, harnesses, and shielded CAN wiring for damage, corrosion, or water ingress at battery interface module and junctions
Verify proper module power and ground voltages at the battery interface control module
Measure CAN high and CAN low idle voltages (typical ~2.5 V for each with ~1.0–2.5 V differential depending on protocol) and check for dominant/recessive transitions
Check termination resistor value across CANH and CANL (approx. 60 ohms for two 120Ω terminators in parallel on classic CAN)

Signal parameters

Expected message ID(s) from Battery Interface Module K (module-specific ID and frequency)
Message payload length and key data bytes (SOC, pack voltage, error flags, CRC if used)
Bus data rate (e.g., 500 kb/s, 250 kb/s, CAN-FD rates) and idle voltages on CANH/CANL
CAN error counter increments and fault frames per minute
Message timing (expected periodicity and allowable jitter)
Checksum/CRC validity and sequence counter increments in the module messages

Diagnostic algorithm

Connect dealer-level or equivalent scan tool and read all U-codes and hybrid/battery module codes from all modules. Record freeze-frame and live data.
Confirm whether the code is current, pending, or historic. If pending, try to reproduce conditions with a road or bench test while monitoring the bus.
Inspect battery interface module K connectors and adjacent harness for corrosion, bent pins, water intrusion, or abrasion. Repair any damage and reseat connectors.
Verify module supply voltage(s) and ground integrity at the module with respect to chassis ground. Repair poor power/ground connections.
With ignition on, measure CANH/CANL idle voltages at the module connector and at a nearby known-good node. Compare to expected levels; check for stuck dominant state or excessive noise.
Check termination resistors across CANH/CANL (expect ~60 ohms total on vehicles with two 120Ω terminators). Replace if out of tolerance.
Monitor the bus with an oscilloscope if available to observe signal integrity, transients, reflections, or missing edges during fault occurrence.
If wiring and bus integrity are good, verify software/firmware versions and calibrations for the battery interface module and related controllers. Reflash or update as recommended by manufacturer.
If the module still transmits invalid data and wiring/software are confirmed good, consider replacing the battery interface control module K. Retest after replacement and clear codes.
After any repair, clear codes and perform road/functional test to confirm proper communications and that the code does not return.

Likely causes

Module connector pins corroded or bent causing intermittent data
CAN high/low voltages outside expected idle levels due to wiring damage or missing termination
Battery interface module power supply or ground fault causing corrupted messages
Software calibration mismatch after a service update or replacement module
Local module hardware failure (transceiver or processor fault)

Fault status

⚠️ Status

Invalid data received from Hybrid/EV Battery Interface Control Module K — communication/data integrity error. Check CAN bus, wiring, power/ground, and module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-4.0 hours