Code
U040E
Generic
U — Network/User
Invalid Data Received From Turbocharger/Supercharger Control Module B
AI status
Completed
Completed
100%
Causes
- Faulty Turbocharger/Supercharger Control Module B (hardware or firmware)
- CAN bus wiring fault (open, short to battery or ground, intermittent connection)
- Poor or missing module power or ground
- Connector corrosion, bent pins, or loose terminals at the module or junctions
- Incorrect module programming or calibration mismatch after replacement
- Bus termination resistor missing or shorted
Symptoms
- Malfunction Indicator Lamp (MIL) or warning light illuminated
- Reduced engine power or limp-home mode
- Erratic or no boost control / turbocharger behavior
- Stored communication/invalid data DTCs, possibly multiple network codes
- Possible intermittent performance issues or stalling under load
What to check
- Read freeze frame and full scan for other related U- and P-codes
- Inspect the Turbocharger/Supercharger Control Module B connector for corrosion, damage, or loose pins
- Verify module supply voltage and ground with key on (compare to battery voltage and chassis ground)
- Measure CAN bus resistance between CAN High and CAN Low (with ignition off) — about 60 ohms typical (two 120Ω terminators in parallel)
- Backprobe CAN High and CAN Low with a scope or lab logger to confirm expected recessive/dominant voltages and message traffic
- Check for CAN High/Low shorts to battery or ground
Signal parameters
- CAN bus idle (recessive) voltage: ~2.5 V on CAN_H and CAN_L
- CAN dominant voltage: CAN_H ~3.5 V, CAN_L ~1.5 V (typical differential signaling)
- Typical bus termination resistance: ~60 ohms between CAN_H and CAN_L (two 120Ω terminators in parallel)
- Common bus speeds: 250 kbps or 500 kbps (vehicle-specific)
- Expected message presence: module should transmit regular status/telemetry frames at defined intervals (IDs and DLC are manufacturer-specific)
- Valid data ranges and checksum/CRC must match module specification (manufacturer-specific)
Diagnostic algorithm
- Verify the DTC and capture freeze frame data. Note when the fault occurred and any related codes.
- Check for other network codes (U0100, U0073, etc.) that indicate broader bus issues.
- Visually inspect Turbocharger/Supercharger Control Module B connector and nearby harness for damage, corrosion, or water intrusion. Repair as needed.
- With ignition on, verify module battery feed and ground voltages at the connector. Repair poor power/ground connections.
- With ignition off, measure resistance between CAN_H and CAN_L at a convenient connector — expect ~60 Ω. If open or very low, trace for missing/shorted terminators.
- Backprobe CAN_H and CAN_L while monitoring with a scope or CAN logger. Confirm bus idles at ~2.5 V, shows proper dominant/recessive transitions, and that messages from Turbocharger Module B appear at expected intervals.
- If messages are missing or payloads look corrupted, inspect wiring for short to battery/ground or intermittent opens. Perform wiggle test while monitoring traffic.
- If wiring and bus appear correct, verify module programming/calibration. Reflash or update firmware per manufacturer procedure if available.
- If possible, substitute a known-good Turbocharger/Supercharger Control Module B (or swap with an identical/module from another bank per manufacturer guidance) to confirm module failure.
- After repairs or module replacement/reprogramming, clear codes and perform a road test under the conditions that originally set the fault. Re-scan and confirm no recurrence.
Likely causes
- Damaged or corroded connector at Turbocharger/Supercharger Control Module B
- CAN High or CAN Low shorted to power/ground or open circuit
- Module lost proper supply voltage or ground intermittently
- Software/calibration mismatch after module replacement or update
- Faulty Turbocharger/Supercharger Control Module B
Fault status
Status
Invalid data received from Turbocharger/Supercharger Control Module B — messages from that control module failed integrity checks or contained out-of-range/unexpected values resulting in a network communication fault.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
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Code
U040E
HYUNDAI
U — Network/User
Invalid Data Received From Turbocharger/Supercharger Control Module “B”
AI status
Completed
Completed
100%
Causes
- Faulty Turbocharger/Supercharger Control Module B (hardware or firmware)
- CAN bus wiring fault (open, short to battery or ground, intermittent connection)
- Poor or missing module power or ground
- Connector corrosion, bent pins, or loose terminals at the module or junctions
- Incorrect module programming or calibration mismatch after replacement
- Bus termination resistor missing or shorted
Symptoms
- Malfunction Indicator Lamp (MIL) or warning light illuminated
- Reduced engine power or limp-home mode
- Erratic or no boost control / turbocharger behavior
- Stored communication/invalid data DTCs, possibly multiple network codes
- Possible intermittent performance issues or stalling under load
What to check
- Read freeze frame and full scan for other related U- and P-codes
- Inspect the Turbocharger/Supercharger Control Module B connector for corrosion, damage, or loose pins
- Verify module supply voltage and ground with key on (compare to battery voltage and chassis ground)
- Measure CAN bus resistance between CAN High and CAN Low (with ignition off) — about 60 ohms typical (two 120Ω terminators in parallel)
- Backprobe CAN High and CAN Low with a scope or lab logger to confirm expected recessive/dominant voltages and message traffic
- Check for CAN High/Low shorts to battery or ground
Signal parameters
- CAN bus idle (recessive) voltage: ~2.5 V on CAN_H and CAN_L
- CAN dominant voltage: CAN_H ~3.5 V, CAN_L ~1.5 V (typical differential signaling)
- Typical bus termination resistance: ~60 ohms between CAN_H and CAN_L (two 120Ω terminators in parallel)
- Common bus speeds: 250 kbps or 500 kbps (vehicle-specific)
- Expected message presence: module should transmit regular status/telemetry frames at defined intervals (IDs and DLC are manufacturer-specific)
- Valid data ranges and checksum/CRC must match module specification (manufacturer-specific)
Diagnostic algorithm
- Verify the DTC and capture freeze frame data. Note when the fault occurred and any related codes.
- Check for other network codes (U0100, U0073, etc.) that indicate broader bus issues.
- Visually inspect Turbocharger/Supercharger Control Module B connector and nearby harness for damage, corrosion, or water intrusion. Repair as needed.
- With ignition on, verify module battery feed and ground voltages at the connector. Repair poor power/ground connections.
- With ignition off, measure resistance between CAN_H and CAN_L at a convenient connector — expect ~60 Ω. If open or very low, trace for missing/shorted terminators.
- Backprobe CAN_H and CAN_L while monitoring with a scope or CAN logger. Confirm bus idles at ~2.5 V, shows proper dominant/recessive transitions, and that messages from Turbocharger Module B appear at expected intervals.
- If messages are missing or payloads look corrupted, inspect wiring for short to battery/ground or intermittent opens. Perform wiggle test while monitoring traffic.
- If wiring and bus appear correct, verify module programming/calibration. Reflash or update firmware per manufacturer procedure if available.
- If possible, substitute a known-good Turbocharger/Supercharger Control Module B (or swap with an identical/module from another bank per manufacturer guidance) to confirm module failure.
- After repairs or module replacement/reprogramming, clear codes and perform a road test under the conditions that originally set the fault. Re-scan and confirm no recurrence.
Likely causes
- Damaged or corroded connector at Turbocharger/Supercharger Control Module B
- CAN High or CAN Low shorted to power/ground or open circuit
- Module lost proper supply voltage or ground intermittently
- Software/calibration mismatch after module replacement or update
- Faulty Turbocharger/Supercharger Control Module B
Fault status
Status
Invalid data received from Turbocharger/Supercharger Control Module B — messages from that control module failed integrity checks or contained out-of-range/unexpected values resulting in a network communication fault.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
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