P0117 2015 GMC Sierra 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 2015 GMC Sierra 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 2015 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 the ECT is warmer than 139°C (282°F) for greater than 5 s.
What are the Possible Causes of the DTC P0117 2015 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 P0117 2015 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 P0117 2015 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 P0117 2015 GMC Sierra Code
What does the OBDII code P0117 mean in a 2015 GMC Sierra?
P0117 indicates that the Engine Control Module (ECM) has detected a low voltage signal from the Engine Coolant Temperature (ECT) sensor circuit, which suggests the sensor is reading an abnormally low temperature.
What are the common symptoms of code P0117 in a 2015 GMC Sierra?
Symptoms may include the check engine light turning on, poor fuel economy, black smoke from the exhaust, difficulty starting, or the engine running rich.
What causes the P0117 code in a 2015 GMC Sierra?
Common causes include a faulty ECT sensor, damaged or corroded wiring, a poor electrical connection, or low coolant levels.
How can I fix the P0117 code on my 2015 GMC Sierra?
Repairs may involve replacing the ECT sensor, repairing or replacing damaged wiring or connectors, refilling coolant, or replacing the ECM if necessary.
Can I drive my 2015 GMC Sierra with the P0117 code?
It’s not recommended to drive for long with this code as it can lead to poor engine performance, increased emissions, and potential damage to the engine.
How do I diagnose the P0117 code in a 2015 GMC Sierra?
Start by using an OBDII scanner to verify the code, inspect the ECT sensor and wiring for damage, check coolant levels, and test the sensor with a multimeter to ensure proper resistance.
Is the ECT sensor expensive to replace on a 2015 GMC Sierra?
The ECT sensor is generally an affordable part, with replacement costs ranging between $50 and $150, including labor, depending on location and mechanic rates.
What happens if the ECT sensor fails completely in a 2015 GMC Sierra?
A failed ECT sensor can cause the engine to run poorly, overheat, or operate inefficiently, as the ECM relies on accurate temperature readings for proper fuel and timing adjustments.
Can low coolant levels trigger the P0117 code in a 2015 GMC Sierra?
Yes, low coolant levels can cause the ECT sensor to read incorrectly, potentially triggering the P0117 code.
Do I need special tools to fix the P0117 code on my 2015 GMC Sierra?
An OBDII scanner and a multimeter are typically required for diagnosis, but basic hand tools are usually sufficient for replacing the ECT sensor or repairing wiring.
Discuss the causes and fixes for P0117 2015 GMC Sierra OBDII Code
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