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Engine-Codes – GMC – P1250 GMC

P1250 GMC Code - Early Fuel Evaporation Heater Circuit

Quick Answer

The P1250 GMC code refers to the Early Fuel Evaporation (EFE) Heater Circuit. Common causes include Wiring issues or electrical connections related to the EFE heater circuit, A faulty EFE heater element, A defective EFE control module. 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
P1250 GMC indicates Early Fuel Evaporation Heater Circuit.
Common causes
Common causes include Wiring issues or electrical connections related to the EFE heater circuit, A faulty EFE heater element, A defective EFE control module.
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 17, 2024
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Code P1250 GMC Description

The P1250 GMC code refers to the Early Fuel Evaporation (EFE) Heater Circuit. This code indicates a problem with the EFE system, which is designed to heat the fuel in the carburetor to aid in cold starting and reduce emissions during warm-up. The EFE system helps vaporize the fuel more efficiently, ensuring a smoother start and better fuel economy.

OBDII Code P1250 GMC - Early Fuel Evaporation Heater Circuit
P1250 GMC Code - Early Fuel Evaporation Heater Circuit

Common Causes of P1250 GMC

  1. Wiring issues or electrical connections related to the EFE heater circuit.
  2. A faulty EFE heater element.
  3. A defective EFE control module.
  4. Blown fuse related to the EFE system.
  5. Corrosion or damage to EFE system components.

Symptoms of P1250 GMC

  1. Difficulty starting the vehicle, especially in cold weather.
  2. Rough idling or stalling when the engine is cold.
  3. Decreased fuel efficiency.
  4. Increased emissions output.
  5. Check Engine Light illuminated on the dashboard.

How to Fix P1250 GMC

  1. Diagnose the EFE system using a scan tool to pinpoint the exact cause of the issue.
  2. Inspect the wiring and electrical connections for any signs of damage or corrosion.
  3. Test the EFE heater element for proper functionality and replace if necessary.
  4. Check the EFE control module for faults and replace if deemed defective.
  5. Replace any blown fuses related to the EFE system.

Cost to Fix P1250 GMC

The typical repair costs for addressing a P1250 GMC code can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $150 to $300. Overall, the total repair cost for addressing this code can be estimated to be between $250 and $600. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle make and model.

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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 P1250 GMC Code

1. What does the OBDII code P1250 mean on a GMC?

P1250 indicates an issue with the Early Fuel Evaporation (EFE) Heater Circuit, which helps optimize fuel vaporization during cold starts.

2. What are the common symptoms of code P1250 in a GMC vehicle?

Symptoms may include poor engine performance during cold starts, reduced fuel efficiency, and an illuminated Check Engine Light.

3. What causes the P1250 code to appear in a GMC?

Common causes include a faulty EFE heater element, damaged wiring or connectors in the heater circuit, or a malfunctioning PCM (Powertrain Control Module).

4. Can I drive my GMC with a P1250 code?

While the vehicle may still be drivable, ignoring this code can lead to reduced fuel efficiency, rough starts, or further damage to the emissions system.

5. How is the P1250 code diagnosed in a GMC?

A mechanic will inspect the EFE heater circuit, check for damaged wiring, test the heater element’s resistance, and verify proper voltage from the PCM.

6. How do you fix the P1250 code on a GMC vehicle?

Repairs may involve replacing a faulty EFE heater, repairing damaged wiring or connectors, or reprogramming/updating the PCM if necessary.

7. Does the P1250 code affect emissions in my GMC?

Yes, a malfunction in the EFE heater system can increase emissions during cold starts, as it impairs efficient fuel vaporization.

8. What tools are needed to troubleshoot the P1250 code on a GMC?

You’ll need an OBDII scanner, a multimeter to test circuit continuity and resistance, and possibly a wiring diagram for your specific vehicle.

9. How much does it cost to repair a P1250 code on a GMC?

Repair costs vary but may range from $100 to $500, depending on whether the issue is a simple wiring fix or a replacement of the EFE heater or PCM.

10. Can a blown fuse cause the P1250 code in a GMC?

Yes, a blown fuse in the EFE heater circuit can disrupt power to the system and trigger the P1250 code.

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