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Home / DTC / U0412 — Invalid Data Received From Battery Energy Control Module A

U0412 — Invalid Data Received From Battery Energy Control Module A

Detailed page for trouble code U0412.

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U0412

Generic U — Network/User

Invalid Data Received From Battery Energy Control Module A

Brand: Generic
Type: U — Network/User
Views: UK: 26 EN: 75 RU: 34
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Battery Energy Control Module A (hardware or firmware)
  • Corroded, loose, damaged or disconnected wiring or connectors between BECM A and vehicle networks
  • CAN/LIN bus faults (open, short to ground/battery, improper termination)
  • Low 12V or HV supply to BECM A (fuses, relays, battery power)
  • Intermittent connections from vibration or water intrusion
  • Software/version mismatch or configuration error after replacement or update

Symptoms

  • MIL/ABS/battery or HV-system warning illuminated
  • Other modules show U0412 or related communication DTCs
  • Reduced propulsion, limited power or limp-home behavior (EV/hybrid)
  • Charging disabled or unpredictable charge behavior
  • Inaccurate or missing SOC, pack voltage, cell data on dash or scan tool
  • Possible no‑start or inability to engage drive if module data required

What to check

  • Retrieve and record all DTCs and freeze frame data from all modules
  • Attempt direct communication with BECM A using a scan tool (present? responds?)
  • Check for other communication DTCs on the CAN bus (U0100, U0121, U0073, etc.)
  • Visually inspect BECM connector, wiring harness, ground straps and fuses/relays for damage, corrosion or looseness
  • Measure 12V supply and ground at BECM connector with ignition on and key off
  • Check HV interlock and HV supply presence if applicable

Signal parameters

  • Message content: pack voltage (vehicle-specific; e.g. ~200–800 V for many EVs)
  • Pack current: signed value in amps (± hundreds A depending on vehicle)
  • State of charge (SOC): 0–100%
  • Cell voltages: per‑cell ~2.5–4.2 V (vehicle dependent)
  • Temperatures: pack and cell temps within expected range (°C)
  • Message period: periodic BECM messages typically 10–200 ms (vehicle dependent)

Diagnostic algorithm

  1. Step 1 — Record faults: Connect a capable scan tool, read and record all DTCs and freeze frame data from all modules; do not clear codes yet.
  2. Step 2 — Confirm comms: Attempt to communicate directly with BECM A. Note whether the module responds, times out, or returns corrupted data.
  3. Step 3 — Look for related codes: Check other modules for CAN/battery related codes (U0100, U0121, U0073, U0401) to scope network issue.
  4. Step 4 — Power/ground/fuse check: With key off and key on as needed, verify 12V feed, main fuses/relays and ground connections at the BECM harness for proper voltages and continuity.
  5. Step 5 — Visual/harness inspection: Inspect BECM connectors, pins and harness routing for corrosion, damage, chafing, water entry or pin/backout; repair as required.
  6. Step 6 — Passive bus checks: Measure CAN_H/CAN_L voltages at the BECM connector with ignition on; confirm idle voltages (~2.5V common-mode) and correct termination resistance (~120 ohm across H/L).

Likely causes

  • CAN high/low shorted or open near BECM A
  • Blown 12V fuse or failed 12V relay powering BECM A
  • Corroded connector pins at BECM harness or bulkhead
  • Module went bus-off due to repeated errors or firmware bug
  • Poor ground at module or chassis ground strap loose
  • Aftermarket equipment or improper repairs affecting the network

Fault status

⚠️ Status
Control module detected data from Battery Energy Control Module A that is invalid, corrupted, or implausible. This indicates a communication or data-integrity problem between the BECM and the vehicle network, or a fault within the BECM.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2.0-5.0 hours

Similar codes

U0100 U0121 U0401 U0415 U0073 U0402
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Code

U0412

HYUNDAI U — Network/User

Invalid Data Received From Battery Energy Control Module A

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 11 EN: 36 RU: 45
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Battery Energy Control Module A (hardware or firmware)
  • Corroded, loose, damaged or disconnected wiring or connectors between BECM A and vehicle networks
  • CAN/LIN bus faults (open, short to ground/battery, improper termination)
  • Low 12V or HV supply to BECM A (fuses, relays, battery power)
  • Intermittent connections from vibration or water intrusion
  • Software/version mismatch or configuration error after replacement or update

Symptoms

  • MIL/ABS/battery or HV-system warning illuminated
  • Other modules show U0412 or related communication DTCs
  • Reduced propulsion, limited power or limp-home behavior (EV/hybrid)
  • Charging disabled or unpredictable charge behavior
  • Inaccurate or missing SOC, pack voltage, cell data on dash or scan tool
  • Possible no‑start or inability to engage drive if module data required

What to check

  • Retrieve and record all DTCs and freeze frame data from all modules
  • Attempt direct communication with BECM A using a scan tool (present? responds?)
  • Check for other communication DTCs on the CAN bus (U0100, U0121, U0073, etc.)
  • Visually inspect BECM connector, wiring harness, ground straps and fuses/relays for damage, corrosion or looseness
  • Measure 12V supply and ground at BECM connector with ignition on and key off
  • Check HV interlock and HV supply presence if applicable

Signal parameters

  • Message content: pack voltage (vehicle-specific; e.g. ~200–800 V for many EVs)
  • Pack current: signed value in amps (± hundreds A depending on vehicle)
  • State of charge (SOC): 0–100%
  • Cell voltages: per‑cell ~2.5–4.2 V (vehicle dependent)
  • Temperatures: pack and cell temps within expected range (°C)
  • Message period: periodic BECM messages typically 10–200 ms (vehicle dependent)

Diagnostic algorithm

  1. Step 1 — Record faults: Connect a capable scan tool, read and record all DTCs and freeze frame data from all modules; do not clear codes yet.
  2. Step 2 — Confirm comms: Attempt to communicate directly with BECM A. Note whether the module responds, times out, or returns corrupted data.
  3. Step 3 — Look for related codes: Check other modules for CAN/battery related codes (U0100, U0121, U0073, U0401) to scope network issue.
  4. Step 4 — Power/ground/fuse check: With key off and key on as needed, verify 12V feed, main fuses/relays and ground connections at the BECM harness for proper voltages and continuity.
  5. Step 5 — Visual/harness inspection: Inspect BECM connectors, pins and harness routing for corrosion, damage, chafing, water entry or pin/backout; repair as required.
  6. Step 6 — Passive bus checks: Measure CAN_H/CAN_L voltages at the BECM connector with ignition on; confirm idle voltages (~2.5V common-mode) and correct termination resistance (~120 ohm across H/L).

Likely causes

  • CAN high/low shorted or open near BECM A
  • Blown 12V fuse or failed 12V relay powering BECM A
  • Corroded connector pins at BECM harness or bulkhead
  • Module went bus-off due to repeated errors or firmware bug
  • Poor ground at module or chassis ground strap loose
  • Aftermarket equipment or improper repairs affecting the network

Fault status

⚠️ Status
Control module detected data from Battery Energy Control Module A that is invalid, corrupted, or implausible. This indicates a communication or data-integrity problem between the BECM and the vehicle network, or a fault within the BECM.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2.0-5.0 hours

Similar codes

U0100 U0121 U0401 U0415 U0073 U0402
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