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Home / DTC / U040D — Invalid Data Received From Turbocharger/Supercharger Control Module “A”

U040D — Invalid Data Received From Turbocharger/Supercharger Control Module “A”

Detailed page for trouble code U040D.

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U040D

HYUNDAI U — Network/User

Invalid Data Received From Turbocharger/Supercharger Control Module “A”

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

Causes

  • Faulty turbocharger/supercharger control module (TCM/boost control module)
  • Open, shorted or damaged CAN bus wiring between modules
  • Poor connector contact or corrosion at turbo module or ECU connectors
  • Low or intermittent power supply or ground to the turbo module
  • Incorrect or mismatched software/calibration in turbo module or PCM
  • Faulty termination resistor(s) or improper CAN bus impedance

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power or limp-in mode
  • Poor or no boost control; abnormal boost pressure
  • Other communication-related DTCs present
  • Intermittent faults that clear after key cycle or reconnect

What to check

  • Read and record all stored DTCs, freeze frame and pending codes with a manufacturer-grade scan tool
  • Check vehicle battery voltage and charging system (low voltage can cause communication errors)
  • Visual inspection of connectors and harness to turbocharger control module for corrosion, bent pins, damage
  • Check module power and ground pins for proper voltage and good resistance to chassis ground
  • Measure CAN bus idle voltages at turbo module connector (CANH, CANL) and compare to known good values
  • Measure CAN bus differential resistance (typical ~60 ohms with two 120 Ω terminators in parallel)

Signal parameters

  • CAN bus idle single-ended voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (nominal ≈ 2.5 V each)
  • CAN dominant state: differential voltage ≈ 2.0 V (CANH rises, CANL falls)
  • Typical CAN bus speed for powertrain networks: commonly 500 kb/s (verify manufacturer specification)
  • Expected bus termination resistance: approx. 60 Ω (two 120 Ω terminators in parallel)
  • Turbo module supply: nominal vehicle battery voltage (~12 V) while key ON

Diagnostic algorithm

  1. Retrieve and document all DTCs, freeze-frame data and module presence using a factory-level scan tool.
  2. Verify battery voltage is within specification (typically >12.4 V at rest and >13.5 V with engine running). Correct charging/battery issues first.
  3. Inspect connectors at the turbocharger/supercharger control module and at the PCM/ECU. Look for bent pins, corrosion, water ingress or damage. Repair or clean as needed.
  4. With ignition ON (engine off), backprobe the turbo module connector: verify ignition-switched 12 V supply and a solid ground. Repair wiring if voltages are out of range or intermittent.
  5. Check CAN bus physical layer: measure CANH and CANL single-ended voltages at the turbo module connector and at the PCM. Compare to expected values. Look for stuck high/low or missing signals.
  6. Measure bus termination resistance between CANH and CANL with ignition OFF. Expect ~60 Ω; open or very low values indicate broken or shorted terminators.
  7. If physical layer is good, use a scan tool to request data from turbo module. If module doesn't respond or returns invalid frames, suspect module failure or firmware mismatch.
  8. Isolate circuits: disconnect turbo module and confirm whether other modules communicate normally. If disconnecting the turbo module clears network errors, suspect the module or its local wiring.
  9. Check for short to battery/ground or high resistance in CAN lines using wiring diagrams. Repair any damaged sections.
  10. If wiring, power and grounds are good and the module still sends invalid data, consider reprogramming/reflashing the turbo module and PCM to the latest calibration per manufacturer service instructions.
  11. Replace the turbocharger/supercharger control module only after verifying wiring and network integrity. Clear codes and retest for proper communication and driveability.

Likely causes

  • Corroded/loose connector at turbocharger control module
  • CANH/CANL shorted or open in harness near turbo module
  • Faulty turbocharger control module
  • Lost 12 V or ground to the turbo module
  • PCM/software mismatch after replacement or update

Fault status

⚠️ Status
Invalid data received from Turbocharger/Supercharger Control Module "A" — communication or data integrity error reported by receiving control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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