P1116 GMC - Engine Coolant Temperature Sensor Signal Unstable Or Intermittent

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P1116 GMC Possible Causes

  • Low engine coolant level
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
  • Faulty engine coolant thermostat

How do I fix code P1116 GMC

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the P1116 GMC code

    Labor: 1.0

    The cost of diagnosing the P1116 GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

P1116 GMC Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1116 GMC Meaning

The Engine Coolant Temperature (ECT) sensor contains a semiconductor device which changes resistance based on temperature (a thermistor). The ECT sensor mounts in the left bank cylinder head near the front of the engine. The ECT sensor has a signal circuit and a ground circuit. The Powertrain Control Module (PCM) applies a voltage (about 5.0 volts) on the signal circuit to the sensor. The PCM monitors changes in this voltage caused by changes in the resistance of the sensor in order to determine the engine coolant temperature.
When the engine coolant is cold, the sensor (thermistor) resistance is high, and the PCMs signal voltage is only pulled down a small amount through the sensor to ground. The PCM senses a high signal voltage (low temperature). When the engine coolant is warm, the sensor resistance is low, and the signal voltage is pulled down a greater amount. This causes the PCM to sense a low signal voltage (high temperature).
OBDII Code P1116 GMC - Engine Coolant Temperature Sensor Signal Unstable Or Intermittent - Engine-Codes.com

P1116 GMC More Information

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