P0117 GMC Code - Engine Coolant Temperature Circuit Low Input
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
- P0117 GMC indicates Engine Coolant Temperature Circuit Low Input.
- 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 P0117 GMC 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 the ECT is warmer than 139°C (282°F) for greater than 5 s.
What are the Possible Causes of the DTC P0117 GMC?
- 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 P0117 GMC?
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 P0117 GMC 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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Information for Specific GMC Models
- P0117 2014 GMC Sierra — Engine Coolant Temperature Circuit Low Input
- P0117 2015 GMC Sierra — Engine Coolant Temperature Circuit Low Input
- P0117 2016 GMC Sierra — Engine Coolant Temperature Circuit Low Input
- P0117 2017 GMC Sierra — Engine Coolant Temperature Circuit Low Input
- P0117 2018 GMC Sierra — Engine Coolant Temperature Circuit Low Input
Frequently Asked Questions about P0117 GMC Code
1. What are the common symptoms of OBDII code P0117 GMC?
The common symptoms of OBDII code P0117 GMC include a decrease in fuel efficiency, overheating engine, rough idling, and a malfunctioning temperature gauge.
2. What are the possible causes of OBDII code P0117 GMC?
Possible causes of OBDII code P0117 GMC include a faulty engine coolant temperature sensor, damaged wiring or connectors in the coolant temperature circuit, low coolant levels, or a malfunctioning thermostat.
3. How can I diagnose the issue related to OBDII code P0117 GMC?
Diagnosing the issue related to OBDII code P0117 GMC involves checking the coolant level, inspecting the wiring and connectors in the coolant temperature circuit, testing the engine coolant temperature sensor, and verifying the thermostat's operation.
4. Can I drive my vehicle with OBDII code P0117 GMC?
It is not recommended to drive your vehicle with OBDII code P0117 GMC, as it can lead to engine overheating and potentially cause severe damage if left unaddressed.
5. How can I repair OBDII code P0117 GMC?
To repair OBDII code P0117 GMC, you may need to replace the engine coolant temperature sensor, repair or replace damaged wiring or connectors, ensure proper coolant levels, and verify the thermostat's functionality.
6. Will resetting the OBDII code P0117 GMC fix the issue?
Resetting the OBDII code P0117 GMC may temporarily clear the code, but it will not fix the underlying issue causing the low input signal from the engine coolant temperature sensor.
7. Can a DIY enthusiast fix OBDII code P0117 GMC?
Depending on your skill level and access to tools, a DIY enthusiast may be able to address OBDII code P0117 GMC by following diagnostic procedures and replacing components like the engine coolant temperature sensor.
8. How important is it to address OBDII code P0117 GMC promptly?
It is crucial to address OBDII code P0117 GMC promptly to prevent potential engine damage, overheating, and other issues that may arise from inaccurate coolant temperature readings.
9. Are there any preventive maintenance tips to avoid OBDII code P0117 GMC?
Regularly checking coolant levels, inspecting wiring and connectors for damage, and ensuring the proper functioning of the engine coolant temperature sensor can help prevent OBDII code P0117 GMC.
10. How much does it cost to repair OBDII code P0117 GMC at a mechanic?
The cost to repair OBDII code P0117 GMC at a mechanic can vary depending on the specific underlying issue, labor rates, and the cost of parts, but it may range from $100 to $300 or more.
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