AutoCodes – GMC – P0218 2014 GMC Sierra

P0218 2014 GMC Sierra Code - Transmission Fluid Overtemperature

Quick Answer

The Transmission Fluid Temperature Sensor is a 2-wire sensor located in the pressure switch manifold. Common causes include Low transmission fluid level, Obstructions to the airflow to the radiator or transmission, Radiator damage. 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: P0218 2014 GMC Sierra indicates Transmission Fluid Overtemperature.
Common causes: Common causes include Low transmission fluid level, Obstructions to the airflow to the radiator or transmission, Radiator damage.
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 239

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 P0218 2014 GMC Sierra Description

The Transmission Fluid Temperature Sensor is a 2-wire sensor located in the pressure switch manifold. The Transmission Control Module (TCM) supplies the transmission fluid temperature sensor signal circuit and a low reference circuit. The resistance of the transmission fluid temperature sensor decreases as the oil temperature increases. The TCM monitors the voltage drop across the transmission fluid temperature sensor and calculates the temperature of the transmission fluid in the sump. The Diagnostic Trouble Code (DTC) sets when the transmission sump temperature is 122°C (251°F) or greater for 10 s.

OBDII Code P0218 2014 GMC Sierra - Transmission Fluid Overtemperature - AutoCodes.com — P0218 2014 GMC Sierra Code - Transmission Fluid Overtemperature

What does this mean?

What are the Possible Causes of the DTC P0218 2014 GMC Sierra?

Low transmission fluid level
Obstructions to the airflow to the radiator or transmission
Radiator damage
Transmission cooling system concerns

How to Fix the DTC P0218 2014 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 P0218 2014 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 P0218 2014 GMC Sierra code?

Need more information on how to fix the P0218 2014 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 P0218 2014 GMC Sierra Code

1. What does the OBDII code P0218 mean on a 2014 GMC Sierra?

P0218 indicates that the transmission fluid temperature has exceeded safe operating limits, which can cause damage to the transmission if not addressed.

2. What are the common symptoms of code P0218 in a GMC Sierra?

Symptoms may include the transmission shifting erratically, the vehicle going into limp mode, a warning light on the dashboard, and a noticeable burning smell from the transmission.

3. What causes the P0218 code in a 2014 GMC Sierra?

Common causes include low transmission fluid levels, a malfunctioning transmission cooler, a clogged cooler line, driving under heavy load conditions, or a faulty temperature sensor.

4. Can I continue driving my GMC Sierra with the P0218 code?

Itâ€™s not recommended to continue driving, as high transmission temperatures can lead to severe internal damage. Address the issue as soon as possible.

5. How do I check the transmission fluid in my 2014 GMC Sierra?

Ensure the vehicle is on a level surface, the engine is warm, and the transmission is in Park. Remove the dipstick, wipe it clean, reinsert it, and check the fluid level and condition.

6. How can I fix the P0218 code on my GMC Sierra?

Repairs may involve replenishing or replacing the transmission fluid, repairing the transmission cooler, unclogging cooler lines, or replacing a faulty temperature sensor.

7. How often should I replace the transmission fluid in a 2014 GMC Sierra?

Itâ€™s generally recommended to change the transmission fluid every 45,000 to 60,000 miles, but consult your ownerâ€™s manual for the manufacturerâ€™s guidelines.

8. Can towing heavy loads trigger the P0218 code?

Yes, towing heavy loads or driving in high ambient temperatures can cause the transmission to overheat and trigger the code.

9. What tools are needed to diagnose the P0218 code?

A diagnostic scan tool to read live data and a thermometer or infrared gun to measure transmission fluid temperature are commonly used.

10. How much does it cost to repair the P0218 code in a GMC Sierra?

Repair costs can vary widely depending on the root cause, ranging from $100 for a fluid change to over $1,000 for major transmission repairs or cooler replacements.