Error code

OBD2 P0116

OBD2P0116
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Engine Coolant Temperature Circuit Range/Performance.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0116 indicates a problem with the engine coolant temperature (ECT) sensor or its circuit, which can affect fuel mixture and engine performance.

Symptoms

  • Check Engine Light is on
  • Poor fuel economy
  • Surging or hesitation during driving

Common Causes

  • Defective ECT sensor
  • High resistance in the sensor wiring
  • Faulty connectors or damaged wiring harness
  • Overheated engine
  • Short to ground on ECT signal circuit

Diagnosis

  1. Verify the temperature difference between the scan tool and actual coolant temperature.
  2. Check for damage or corrosion in ECT sensor wiring and connector.
  3. Test resistance of the ECT sensor at different temperatures.
  4. Ensure radiator is full and properly pressurized.

Fixes

  • Replace faulty ECT sensor

FAQ

What does P0116 mean?

P0116 indicates a problem with the engine coolant temperature (ECT) sensor or its circuit.

How do I diagnose P0116?

Use a scan tool to check for differences between actual and displayed coolant temperatures, inspect wiring and connectors, and test ECT sensor resistance at various temperatures.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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