U020C

Code

Generic U — Network/User

Lost Communication With Wireless Accessory Charging Module A

Brand: Generic

Type: U — Network/User

Views: UK: 26 EN: 54 RU: 22

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Page language: EN

Wireless accessory charging module failure (internal electronics or firmware)
Loss of module power (blown fuse, open circuit, poor connector pin contact)
Poor or missing ground at the module
Open, shorted, or high-resistance CAN/LIN wiring or connector between the module and gateway/ECU
Faulty vehicle network (CAN/LIN) termination or wiring harness damage
Network interference, short to battery or ground, or low battery voltage during key on

Read and record all U-codes and freeze frame data with a capable scan tool
Check for related codes (other U0xxx codes) that indicate broader network issues
Verify module presence on the network via scan tool (module listed or not)
Visually inspect wiring and connectors at the wireless charging module for damage, corrosion, or loose pins
Check relevant fuses and power feed(s) to the module
Measure module supply voltage and ground integrity (key ON and engine OFF/ON as required)

CAN bus idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V)
CAN bus dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
Typical CAN bus termination: ≈ 60 ohms between CAN_H and CAN_L (two 120 Ω terminators in parallel)
Module supply voltage: nominal vehicle battery voltage (≈ 9–16 V depending on system state)
Module ground: near 0 V, low resistance to chassis (
LIN bus idle: ~12 V pulled up (if applicable) and digital low pulses for data

Record all DTCs and live data; note if U020C is permanent or intermittent.
Attempt to communicate with the wireless charging module using a dealer-level or OEM-capable scan tool. If the module responds, review software version and capabilities.
Clear codes and perform a key-cycling test to see if the fault returns; watch for patterns (temperature, vibration, door open).
Visually inspect the module, connector, and harness for damage, corrosion, bent pins, water intrusion, or repairs near the pad area.
Verify fuses and power feed to the module; measure module supply voltage with key ON and verify ground integrity.
Check for continuity and short circuits on CAN_H and CAN_L between module connector and gateway/ECU. Measure resistance between CAN_H and CAN_L to confirm proper termination (~60 Ω).
Use an oscilloscope or CAN bus analyzer to confirm bus activity and look for expected frames; verify if the module transmits or is silent.
If bus shows noise or missing termination, isolate segments (disconnect nodes) and retest to find the fault location.
If wiring and vehicle network are good but module does not respond, consider reflashing or reprogramming module software if updates are available.
If programming fails or code persists after known-good software, replace the wireless charging module and retest. After repair, clear codes and verify operation during a road test or typical use cycle.

Blown fuse or disconnected power supply to the wireless charging module
Corroded or loose connector pins at the charging module
Damaged CAN high/low wires (chafing, pinched, or broken) near module or harness junction
Faulty module that does not respond to network messages
Faulty gateway/ECU port or missing network termination resistor