AutoCodes – GMC – P01F0 2018 GMC Sierra

P01F0 2018 GMC Sierra Code - Coolant Temperature Dropped Below Diagnostic Monitoring Temperature

Quick Answer

The Engine Coolant Temperature (ECT) Sensor is a 2-wire negative temperature coefficient thermistor. Common causes include Faulty Thermostat, Faulty Engine Coolant Temperature (ECT) Sensor, Engine Coolant Temperature Sensor harness is open or shorted. 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: P01F0 2018 GMC Sierra indicates Coolant Temperature Dropped Below Diagnostic Monitoring Temperature.
Common causes: Common causes include Faulty Thermostat, Faulty Engine Coolant Temperature (ECT) Sensor, Engine Coolant Temperature Sensor harness is open or shorted.
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 266

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 09, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P01F0 2018 GMC Sierra Description

The Engine Coolant Temperature (ECT) Sensor is a 2-wire negative temperature coefficient thermistor. As the temperature of the fluid increases, the resistance of the sensor decreases, varying the voltage on the signal circuit. The Engine Control Module (ECM) uses this diagnostic to determine that the Engine Coolant Temperature (ECT) does not fall below a minimum calibrated temperature after the vehicle has reached normal operating condition. The Diagnostic Trouble Code (DTC) will be set if the Engine Coolant Temperature is less than 71°C (160°F) for greater than 30 s.

OBDII Code P01F0 2018 GMC Sierra - Coolant Temperature Dropped Below Diagnostic Monitoring Temperature - AutoCodes.com — P01F0 2018 GMC Sierra Code - Coolant Temperature Dropped Below Diagnostic Monitoring Temperature

What does this mean?

What are the Possible Causes of the DTC P01F0 2018 GMC Sierra?

Faulty Thermostat
Faulty Engine Coolant Temperature (ECT) Sensor
Engine Coolant Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P01F0 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 P01F0 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.

Need more information about the P01F0 2018 GMC Sierra code?

Need more information on how to fix the P01F0 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P01F0 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P01F0 2018 GMC Sierra Code

1. What does the OBDII code P01F0 mean on a 2018 GMC Sierra?

The P01F0 code indicates that the engine coolant temperature has dropped below the diagnostic monitoring temperature range, which may impact the engine's performance.

2. What are the common symptoms of code P01F0 in a 2018 GMC Sierra?

Symptoms may include poor fuel economy, extended warm-up times, the check engine light turning on, or reduced heater performance in cold weather.

3. What causes the P01F0 code to appear on a 2018 GMC Sierra?

Common causes include a stuck-open thermostat, low coolant levels, a faulty engine coolant temperature sensor, or wiring issues in the temperature sensor circuit.

4. Can a stuck-open thermostat trigger the P01F0 code?

Yes, a stuck-open thermostat can prevent the engine from reaching the proper operating temperature, triggering the P01F0 code.

5. How can I diagnose the P01F0 code on my 2018 GMC Sierra?

Start by checking the coolant level, inspecting for leaks, and verifying the thermostat operation. Use an OBDII scanner to monitor coolant temperature readings and check for faulty wiring or sensors.

6. Is it safe to drive with the P01F0 code on a 2018 GMC Sierra?

Driving with this code is generally safe in the short term, but prolonged operation with low engine temperature can cause poor fuel efficiency and increased engine wear.

7. How do I fix the P01F0 code on a 2018 GMC Sierra?

Repairs may include replacing a faulty thermostat, fixing wiring issues, topping off or flushing the coolant, or replacing the engine coolant temperature sensor if it's defective.

8. Can low coolant levels cause the P01F0 code?

Yes, low coolant levels can prevent the engine from maintaining proper operating temperature, leading to the P01F0 code.

9. How much does it cost to fix the P01F0 code on a 2018 GMC Sierra?

Repair costs vary but typically range from $150 to $300 for thermostat replacement, while sensor replacements or wiring repairs may cost less.

10. Can extreme cold weather cause the P01F0 code to appear?

Yes, extreme cold weather can slow engine warm-up times, potentially causing the P01F0 code if the engine fails to reach the diagnostic temperature threshold.