U0073 on GMC Sierra 1500
Factory diagnostic protocol and troubleshooting wire for fault code U0073 specifically for the GMC Sierra 1500 (2020–2026, 5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel).
1. Symptoms of U0073 on GMC Sierra 1500
When the Engine Control Module (ECM/PCM) on your GMC Sierra 1500 (5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel) logs fault code U0073, drivers commonly observe:
2. Most Likely Causes on GMC Sierra 1500
Historical warranty claims and technical repair bulletins for GMC Sierra 1500 point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for GMC Sierra 1500
Remove any aftermarket insurance dongles, GPS trackers, or scan tools plugged into the DLC port. on the GMC Sierra 1500 equipped with 5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel.
Inspect braided ground straps on engine and transmission. Clean all contact surfaces to bare metal. on the GMC Sierra 1500 equipped with 5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel.
Scan all modules on vehicle. Note which modules are online and which are offline to pinpoint the break in the network daisy-chain. on the GMC Sierra 1500 equipped with 5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel.
Verify 60 ohms across Pins 6 and 14 with battery disconnected. on the GMC Sierra 1500 equipped with 5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel.
Clear DTCs from all modules and road test to verify error-free network transmission. on the GMC Sierra 1500 equipped with 5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel.
Equipment for Diagnosing GMC Sierra 1500 (U0073)
GMC Sierra 1500 OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for GMC Sierra 1500.
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.
Other Common Fault Codes on GMC Sierra 1500
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the GMC Sierra 1500:
4. GMC Sierra 1500 U0073 FAQs
What causes code U0073 to trigger on a GMC Sierra 1500?
On the GMC Sierra 1500 (5.3L / 6.2L EcoTec3 V8 (Denali 420HP) / 3.0L Duramax Turbo-Diesel), U0073 is most frequently caused by Loose or corroded ground connection on transmission or frame or Faulty Transmission Control Module (TCM) or ABS module pulling bus down.
Where is the OBD-II port located on my GMC Sierra 1500?
On the GMC Sierra 1500, the 16-pin DLC diagnostic connector is located Under driver dashboard, left of steering column. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my GMC Sierra 1500 with code U0073?
No. Bus is shut down due to excessive transmission errors, leaving vehicle in unpredictable limp mode. Given that U0073 carries a Critical severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.