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2026 GMC SIERRA EV AT4
Dual Motor Electric AT4•AWD•ev
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Repairs0Labor326Torque63Fluid5DTC849Battery1Maintenance0Recalls0
P0116moderate severityPowertrain

ECT Sensor 1 Circuit Range/Performance

on 2026 GMC Sierra EV AT4 Dual Motor Electric AT4 · AWD

What this code means

The ECT sensor reading is not changing appropriately as the engine warms up.

Symptoms

  • Check Engine Light
  • Poor fuel economy
  • Overheating concern
  • Fan issues

Common causes

  • Stuck thermostat
  • Faulty ECT sensor
  • Air pocket in cooling system
  • Low coolant

Diagnostic steps

  1. Monitor ECT warmup curve
  2. Test thermostat
  3. Check for air in system
  4. Test sensor

Repair notes

Replace thermostat or ECT sensor. Bleed cooling system.

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