AutoCodes – GMC – P0119 2017 GMC Sierra

P0119 2017 GMC Sierra Code - Engine Coolant Temperature Circuit Intermittent

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: P0119 2017 GMC Sierra indicates Engine Coolant Temperature Circuit Intermittent.
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.

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Code Popularity 228

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0119 2017 GMC Sierra Description

The Engine Coolant Temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The Engine Control Module (ECM) supplies 5 V to the ECT sensor signal circuit and a ground for the low reference circuit.
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 Intermittent for greater than 3 s.

OBDII Code P0119 2017 GMC Sierra - Engine Coolant Temperature Circuit Intermittent - AutoCodes.com — P0119 2017 GMC Sierra Code - Engine Coolant Temperature Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0119 2017 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 P0119 2017 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 P0119 2017 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.

Need more information about the P0119 2017 GMC Sierra code?

Need more information on how to fix the P0119 2017 GMC Sierra code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0119 2017 GMC Sierra Code

What does OBDII code P0119 mean on a 2017 GMC Sierra?

P0119 indicates an intermittent fault in the Engine Coolant Temperature (ECT) sensor circuit, which monitors the engine's coolant temperature.

What are the common symptoms of code P0119 on a 2017 GMC Sierra?

Symptoms may include poor engine performance, reduced fuel efficiency, rough idling, difficulty starting, or the engine overheating.

What causes the P0119 code on a 2017 GMC Sierra?

Causes can include a faulty ECT sensor, damaged wiring or connectors, corrosion in the circuit, or a failing engine control module (ECM).

Can I drive my 2017 GMC Sierra with a P0119 code?

Driving with code P0119 is not recommended, as it may lead to engine overheating, poor performance, or further damage.

How do I fix the P0119 code on my 2017 GMC Sierra?

Repairs may involve replacing the ECT sensor, repairing damaged wiring or connectors, cleaning corrosion, or reprogramming the ECM if necessary.

How do I locate the Engine Coolant Temperature sensor on a 2017 GMC Sierra?

The ECT sensor is typically located near the thermostat housing or on the engine block where it can monitor coolant temperature.

Can a bad thermostat trigger the P0119 code on a 2017 GMC Sierra?

Yes, a malfunctioning thermostat that affects coolant flow or temperature regulation can contribute to this code.

How much does it cost to repair a P0119 code on a 2017 GMC Sierra?

Repair costs vary but may range from $50 to $200 for an ECT sensor replacement, plus additional labor costs if wiring or ECM repairs are needed.

Can a low coolant level cause the P0119 code on a 2017 GMC Sierra?

Yes, low coolant levels can cause inaccurate temperature readings and may trigger the P0119 code.

How can I prevent the P0119 code from occurring on my 2017 GMC Sierra?

Regular maintenance, including checking coolant levels, inspecting wiring and connectors, and replacing worn components, can help prevent the P0119 code.