U0073 on Mercedes-Benz GLS
Factory diagnostic protocol and troubleshooting wire for fault code U0073 specifically for the Mercedes-Benz GLS (2020–2026, 3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach)).
1. Symptoms of U0073 on Mercedes-Benz GLS
When the Engine Control Module (ECM/PCM) on your Mercedes-Benz GLS (3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach)) logs fault code U0073, drivers commonly observe:
2. Most Likely Causes on Mercedes-Benz GLS
Historical warranty claims and technical repair bulletins for Mercedes-Benz GLS point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Mercedes-Benz GLS
Remove any aftermarket insurance dongles, GPS trackers, or scan tools plugged into the DLC port. on the Mercedes-Benz GLS equipped with 3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach).
Inspect braided ground straps on engine and transmission. Clean all contact surfaces to bare metal. on the Mercedes-Benz GLS equipped with 3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach).
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 Mercedes-Benz GLS equipped with 3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach).
Verify 60 ohms across Pins 6 and 14 with battery disconnected. on the Mercedes-Benz GLS equipped with 3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach).
Clear DTCs from all modules and road test to verify error-free network transmission. on the Mercedes-Benz GLS equipped with 3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach).
Equipment for Diagnosing Mercedes-Benz GLS (U0073)
Mercedes-Benz GLS OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Mercedes-Benz GLS.
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 Mercedes-Benz GLS
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Mercedes-Benz GLS:
4. Mercedes-Benz GLS U0073 FAQs
What causes code U0073 to trigger on a Mercedes-Benz GLS?
On the Mercedes-Benz GLS (3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach)), 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 Mercedes-Benz GLS?
On the Mercedes-Benz GLS, the 16-pin DLC diagnostic connector is located Driver lower knee bolster trim panel. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Mercedes-Benz GLS 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.