P0116 2018 GMC Sierra Code - Engine Coolant Temperature Sensor Performance
Quick Answer
The Engine Coolant Temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0116 2018 GMC Sierra indicates Engine Coolant Temperature Sensor Performance.
- Common causes
- Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0116 2018 GMC Sierra Description
The ECM uses this high side coolant rationality diagnostic to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the ignition is OFF. If the calibrated ignition OFF time is met at start-up, the ECM will compare the temperature difference between the ECT and the intake air temperature (IAT) to determine if the temperatures are within an acceptable operating range of each other. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a temperature difference at power-up that indicates that the ECT sensor is 30° C (86° F) warmer than the IAT sensor for less than 1 s.
What are the Possible Causes of the DTC P0116 2018 GMC Sierra?
- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature sensor harness is open or shorted
- Engine Coolant Temperature sensor electrical circuit poor connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0116 2018 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0116 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0116 2018 GMC Sierra Code
1. What does the OBDII code P0116 mean for a 2018 GMC Sierra?
P0116 indicates a problem with the Engine Coolant Temperature (ECT) sensor's performance, where the sensor readings are inconsistent or out of range.
2. What are common symptoms of code P0116 in a 2018 GMC Sierra?
Symptoms include poor engine performance, hard starting, fluctuating coolant temperature readings, reduced fuel efficiency, and possible overheating.
3. What causes code P0116 on a 2018 GMC Sierra?
Common causes include a faulty ECT sensor, wiring issues, a damaged thermostat, or low engine coolant levels.
4. Can driving with code P0116 damage my 2018 GMC Sierra?
Driving with P0116 can lead to engine overheating or performance issues, so it’s best to address the problem promptly to avoid potential engine damage.
5. How do I diagnose code P0116 on a 2018 GMC Sierra?
Use an OBDII scanner to confirm the code, then inspect the ECT sensor, wiring connections, thermostat, and coolant levels for potential issues.
6. How do I fix code P0116 on a 2018 GMC Sierra?
Repairs may include replacing the ECT sensor, repairing damaged wiring, replacing the thermostat, or topping off coolant levels.
7. How much does it cost to repair code P0116 on a 2018 GMC Sierra?
The cost varies based on the issue, with ECT sensor replacement typically ranging from $150 to $250, while thermostat repairs may cost $200 to $400.
8. Can low coolant levels cause code P0116 on a 2018 GMC Sierra?
Yes, insufficient coolant can lead to erratic temperature readings and trigger the P0116 code.
9. Is it necessary to replace the thermostat for code P0116 on a 2018 GMC Sierra?
Not always, but if the thermostat is stuck or malfunctioning, it may need replacement to resolve the issue.
10. How can I prevent code P0116 from occurring again on my 2018 GMC Sierra?
Regular maintenance, including checking coolant levels, inspecting wiring, and replacing the ECT sensor as needed, can help prevent this code.
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