P1258 2014 GMC Sierra Code - Engine Coolant Overtemperature Protection Mode Active
Quick Answer
The Engine Control Module (ECM) uses the Engine Coolant Temperature (ECT) sensor to monitor the engine for an over-temperature condition. Common causes include Low Engine Coolant, Faulty Thermostat, Faulty Engine Coolant Temperature 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
- P1258 2014 GMC Sierra indicates Engine Coolant Overtemperature Protection Mode Active.
- Common causes
- Common causes include Low Engine Coolant, Faulty Thermostat, Faulty Engine Coolant Temperature 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 P1258 2014 GMC Sierra Description
What are the Possible Causes of the DTC P1258 2014 GMC Sierra?
- Low Engine Coolant
- Faulty Thermostat
- Faulty Engine Coolant Temperature Sensor
- Engine Coolant Temperature Sensor harness is open or shorted
- Engine Coolant Temperature Sensor circuit poor electrical connection
How to Fix the DTC P1258 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 P1258 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 P1258 2014 GMC Sierra code?
Need more information on how to fix the P1258 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1258 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1258 2014 GMC Sierra Code
1. What does the OBDII code P1258 on a 2014 GMC Sierra indicate?
The code P1258 indicates that the Engine Coolant Overtemperature Protection Mode is active, signaling a potential issue with the cooling system.
2. What are the common symptoms of the P1258 code in a 2014 GMC Sierra?
Common symptoms may include the engine running hotter than normal, the temperature gauge reading very high, and potential engine performance issues such as reduced power or overheating.
3. What are the possible causes of the P1258 code in a 2014 GMC Sierra?
Possible causes of the P1258 code include a malfunctioning thermostat, a faulty cooling fan, low coolant levels, a malfunctioning coolant temperature sensor, or a problem with the engine control module.
4. How can I diagnose the P1258 code in my 2014 GMC Sierra?
Diagnosing the P1258 code may involve checking the coolant level, inspecting the thermostat, testing the cooling fan, and scanning the vehicle's computer for any related trouble codes.
5. What are some repair tips for addressing the P1258 code in a 2014 GMC Sierra?
Repair tips may include replacing the thermostat, repairing or replacing the cooling fan, topping up coolant levels, checking and replacing the coolant temperature sensor if necessary, and clearing the trouble codes from the vehicle's computer.
6. Can driving with the P1258 code active cause further damage to my 2014 GMC Sierra?
Continuing to drive with the P1258 code active can potentially lead to engine overheating, which may cause severe damage to engine components and result in costly repairs.
7. Is it safe to reset the code and continue driving my 2014 GMC Sierra without addressing the underlying issue?
It is not recommended to simply reset the code without addressing the root cause, as the issue may persist and potentially lead to more serious problems down the line.
8. How much does it typically cost to repair the P1258 code in a 2014 GMC Sierra?
The cost of repairing the P1258 code can vary depending on the specific underlying issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.
9. Can I fix the P1258 code in my 2014 GMC Sierra myself, or should I take it to a professional mechanic?
While some DIY enthusiasts may be able to address simpler causes like low coolant levels, more complex issues related to the P1258 code may require the expertise of a professional mechanic.
10. How urgent is it to address the P1258 code in a 2014 GMC Sierra?
It is important to address the P1258 code promptly to prevent potential engine damage and ensure the safe operation of your vehicle.
Discuss the causes and fixes for P1258 2014 GMC Sierra OBDII Code
Code P1258 2014 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
