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Engine-Codes – GMC – P1258 2016 GMC Sierra

P1258 2016 GMC Sierra Code - Engine Coolant Overtemperature Protection Mode Active

Quick Answer

The P1258 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Engine Coolant Overtemperature Protection Mode is active. Common causes include Malfunctioning thermostat, Coolant leak, Faulty water pump. 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
P1258 2016 GMC Sierra indicates Engine Coolant Overtemperature Protection Mode Active.
Common causes
Common causes include Malfunctioning thermostat, Coolant leak, Faulty water pump.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P1258 2016 GMC Sierra Description

The P1258 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Engine Coolant Overtemperature Protection Mode is active. This means that the engine's cooling system has detected that the coolant temperature has exceeded safe levels, triggering a protective mode to prevent damage to the engine. When this code is present, the engine may be operating at a reduced power level to prevent overheating.

OBDII Code P1258 2016 GMC Sierra - Engine Coolant Overtemperature Protection Mode Active
P1258 2016 GMC Sierra Code - Engine Coolant Overtemperature Protection Mode Active

Common Causes of P1258 2016 GMC Sierra

  1. Malfunctioning thermostat
  2. Coolant leak
  3. Faulty water pump
  4. Clogged radiator
  5. Low coolant level

Symptoms of P1258 2016 GMC Sierra

  1. Engine overheating
  2. Reduced engine power
  3. Illuminated Check Engine Light
  4. Increased coolant temperature gauge reading
  5. Engine running rough or misfiring

How to Fix P1258 2016 GMC Sierra

  1. Check the coolant level and top up if necessary.
  2. Inspect the thermostat for proper operation and replace if faulty.
  3. Check for any coolant leaks and repair as needed.
  4. Inspect the water pump for proper function and replace if necessary.
  5. Flush the cooling system and replace the coolant if contaminated.

Cost to Fix P1258 2016 GMC Sierra

The cost of repairing the Engine Coolant Overtemperature Protection Mode issue on a 2016 GMC Sierra can vary depending on the specific cause of the problem. On average, the cost of parts and labor for this repair can range from $200 to $600. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 P1258 2016 GMC Sierra Code

1. What does the OBDII code P1258 mean on a 2016 GMC Sierra?

P1258 indicates that the Engine Coolant Overtemperature Protection Mode has been activated due to excessively high engine coolant temperatures.

2. What are the common symptoms of code P1258 on a 2016 GMC Sierra?

Symptoms include reduced engine power, high coolant temperature readings, the engine entering protection mode, and possible dashboard warning lights.

3. What causes code P1258 on a 2016 GMC Sierra?

Common causes include low coolant levels, a stuck thermostat, a malfunctioning water pump, a faulty radiator fan, or a clogged radiator.

4. Can I drive my 2016 GMC Sierra with code P1258 active?

It’s not recommended to drive the vehicle, as continued operation with high coolant temperatures can cause severe engine damage, such as a blown head gasket.

5. How do I fix code P1258 on a 2016 GMC Sierra?

Check and refill coolant if low, inspect for leaks, replace the thermostat if stuck, ensure the radiator fan is functioning, and clean or replace a clogged radiator.

6. How does the Engine Coolant Overtemperature Protection Mode work on a GMC Sierra?

The protection mode reduces engine power to prevent overheating and minimize the risk of severe engine damage.

7. What tools do I need to diagnose code P1258 on a 2016 GMC Sierra?

You may need an OBDII scanner, a coolant pressure tester, and basic automotive tools to inspect components like the thermostat, radiator, and water pump.

8. Can a bad temperature sensor cause code P1258 on a 2016 GMC Sierra?

Yes, a faulty coolant temperature sensor can send incorrect readings to the engine control module, triggering the code.

9. How much does it cost to repair code P1258 on a 2016 GMC Sierra?

Repair costs vary depending on the cause but can range from $50 for a thermostat replacement to several hundred dollars for a water pump or radiator repair.

10. How can I prevent code P1258 on my 2016 GMC Sierra?

Regularly check coolant levels, inspect for leaks, ensure proper maintenance of the cooling system, and replace worn components as needed.

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