U0104 on 2018 GMC Yukon
Technical troubleshooting wire for fault code U0104 specifically tailored for the 2018 GMC Yukon. Includes wiring sensor pinouts, freeze frame PID parameters, and step-by-step diagnostic tree.
Common 2018 Yukon Symptoms
- Adaptive Cruise Control (ACC) disabled
- Pre-Collision System warning light on
- Check Engine Light on
Likely Root Causes on 2018 Yukon
- Blocked or dirty front radar sensor in grille/bumper
- Blown radar module fuse
- Faulty radar cruise control module
- Misaligned radar sensor following minor bumper bump
Step-by-Step Fix Protocol for 2018 GMC Yukon
Connect an OBD-II scanner to the DLC port under the driver dashboard. Record engine RPM, Short Term / Long Term Fuel Trim (STFT/LTFT), and engine coolant temperature at the moment U0104 set.
Inspect the sensor connector on the 2018 Yukon engine bay. Use a multimeter to verify reference voltage (5.0V / 12.0V) and ground continuity.
Replace the verified defective component using OEM or equivalent grade parts. Clear DTC U0104 and complete an EPA drive cycle to verify readiness monitors set to READY.
Equipment for Diagnosing 2018 GMC Yukon (U0104)
2018 GMC Yukon OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for 2018 GMC Yukon.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.