U058C

Code

Generic U — Network/User

Invalid Data Received From Active Grille Air Shutter Module C

Brand: Generic

Type: U — Network/User

Views: UK: 21 EN: 24 RU: 21

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CAN/LIN network communication error between control module and Active Grille Air Shutter Module C
Faulty or intermittent wiring, connector corrosion, or broken pins at the shutter module
Power or ground problem at the shutter module (low voltage, open ground)
Failed or malfunctioning Active Grille Air Shutter Module C
Software mismatch or corrupted calibration in the shutter module or master control module
Bus termination fault or excessive network noise

Malfunction Indicator Lamp (MIL) or warning light related to vehicle networks or emissions may be set
Front grille shutters stuck open or closed or do not respond to commands
Reduced aerodynamic/cooling control performance (may affect engine temperature in some conditions)
Stored U058C (and possibly related network codes) in scan tool
Intermittent operation of shutter system or inconsistent position readings

Use a OE-level scan tool to read U058C, related U-codes, and any freeze frame or live data from the shutter module and gateway
Check for other network codes (U0100, U0073, U0401, etc.) that indicate broader bus issues
Visually inspect the shutter module connector and wiring harness for damage, corrosion, bent pins, or water intrusion
Measure battery voltage at the module connector with ignition on; verify proper ground continuity
Check termination resistors and inspect CAN bus wiring for chafing, shorts, or loose splices; backprobe if needed
Perform wiggle test of wiring while monitoring live data or DTC status for intermittent faults

Network type: typically CAN (ISO 11898) or manufacturer LIN/CAN gateway; verify vehicle-specific bus
Idle voltages: CAN_H and CAN_L each ~2.5 V; differential idle ≈ 0 V, dominant ≈ 2 V (CAN_H high, CAN_L low)
Message content: module should broadcast periodic status frames containing shutter position, fault flags, and ACKs
Message frequency: periodic status frames commonly 1–20 Hz (vehicle-specific)
Fault signature: malformed frames, incorrect checksum/CRC, missing expected periodic ID, or invalid data bytes
Timing: look for missing frames, unexpected data values, or bus error counters increasing

Verify the code: clear DTCs, perform test drive or cycles to see if U058C returns and note freeze-frame data.
Scan: record all related DTCs and live data from the shutter module, gateway, BCM, and powertrain modules to determine scope.
Visual/wiring: inspect and repair any obvious wiring, connectors, or corrosion at the shutter module and associated harness areas.
Power/ground: verify proper supply voltage and ground at the module connector with key on; repair open/low circuits.
Network check: using a scan tool or oscilloscope, verify the presence of valid CAN/LIN frames for the shutter module ID and check for noise, bus-off, or malformed frames.
Isolation: if network traffic is abnormal, isolate wiring sections or disconnect non-essential nodes to identify the source of interference or short.
Module test: if wiring and network are good, consider reflashing/updating module software per OEM procedures. If update unavailable or unsuccessful, substitute a known-good shutter module (if possible) to confirm module failure.
Repair and verify: repair wiring or replace module as indicated, clear codes, and confirm the fault does not return through drive cycles and functional checks.

Open, shorted or corroded connector at the shutter module
CAN transceiver on shutter module or gateway/BCM failure
Low supply voltage or poor ground at the shutter module
Module firmware/software incompatibility after service or update
Intermittent wiring damage (chaffing, pinched harness) near front-end or radiator area