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Engine-Codes – GMC – P159F GMC

P159F GMC Code - Fuel Economy Mode Switch Circuit Low Voltage

Quick Answer

The P159F GMC code refers to the Fuel Economy Mode Switch Circuit Low Voltage. Common causes include Faulty fuel economy mode switch, Damaged wiring or connectors in the circuit, Issues with the engine 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
P159F GMC indicates Fuel Economy Mode Switch Circuit Low Voltage.
Common causes
Common causes include Faulty fuel economy mode switch, Damaged wiring or connectors in the circuit, Issues with the engine 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 09, 2024
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Code P159F GMC Description

The P159F GMC code refers to the Fuel Economy Mode Switch Circuit Low Voltage. This code typically indicates a problem with the fuel economy mode switch circuit in the vehicle. The fuel economy mode switch is responsible for adjusting the vehicle's performance to optimize fuel efficiency. When the voltage in this circuit is detected as low, it can lead to issues with the vehicle's fuel economy and overall performance.

OBDII Code P159F GMC - Fuel Economy Mode Switch Circuit Low Voltage
P159F GMC Code - Fuel Economy Mode Switch Circuit Low Voltage

Common Causes of P159F GMC

  1. Faulty fuel economy mode switch
  2. Damaged wiring or connectors in the circuit
  3. Issues with the engine control module
  4. Electrical system malfunctions
  5. Corrosion in the circuit components

Symptoms of P159F GMC

  1. Decreased fuel efficiency
  2. Engine performance issues
  3. Check Engine Light illuminated
  4. Difficulty switching into fuel economy mode
  5. Rough idling or stalling

How to Fix P159F GMC

  1. Begin by diagnosing the issue using a scan tool to read the trouble codes and pinpoint the exact cause of the problem.
  2. Inspect the fuel economy mode switch, wiring, and connectors for any signs of damage or corrosion.
  3. Test the voltage in the circuit to determine if it is indeed low, indicating a problem with the circuit.
  4. Replace any faulty components, such as the fuel economy mode switch or damaged wiring, and ensure all connections are secure.
  5. Clear the trouble codes and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P159F GMC

The typical repair costs for addressing a P159F GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost for parts and labor to repair this issue can range from $100 to $300. It's important to note that the cost of diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. To get a more precise estimate, it's recommended to check with local auto repair shops.

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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 P159F GMC Code

1. What are the common symptoms of OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage?

The common symptoms of this code may include poor fuel economy, rough idle, and issues with the vehicle's performance.

2. What are the possible causes of OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage?

Possible causes of this code include a faulty fuel economy mode switch, damaged wiring or connectors in the circuit, or a problem with the vehicle's powertrain control module (PCM).

3. How can I diagnose OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage?

Diagnosing this code typically involves using a scan tool to read the code, checking the fuel economy mode switch for proper operation, inspecting the wiring and connectors for damage, and testing the PCM to ensure it is functioning correctly.

4. Can I drive my vehicle with OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage?

It is generally not recommended to drive your vehicle with this code present, as it can impact fuel efficiency and overall performance. It's best to address the issue promptly.

5. How can I repair OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage?

Repairing this code may involve replacing the fuel economy mode switch, repairing any damaged wiring or connectors, or reprogramming the PCM to resolve the issue.

6. Is OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage a serious issue?

While this code may not cause immediate harm to your vehicle, it can lead to decreased fuel efficiency and performance over time if left unresolved.

7. Can a DIY enthusiast fix OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage?

Depending on your level of expertise, you may be able to diagnose and repair this code yourself by following proper diagnostic procedures and using the necessary tools.

8. How much does it cost to fix OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage?

The cost of fixing this code can vary depending on the underlying cause and whether you choose to repair it yourself or seek professional help. Costs may include parts and labor.

9. Will OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage cause my check engine light to illuminate?

Yes, this code will typically trigger the check engine light to illuminate on your vehicle's dashboard, indicating a potential issue that needs attention.

10. How can I prevent OBDII code P159F (GMC) Fuel Economy Mode Switch Circuit Low Voltage from occurring in the future?

To prevent this code from recurring, it's essential to regularly maintain your vehicle, address any issues promptly, and follow recommended maintenance schedules provided by the manufacturer.

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