[SOLVED] P159F Code: Fuel Economy Mode Switch Circuit Low Voltage – Fix Now!

The automobile fault code P159F indicates a problem with the Fuel Economy Mode Switch.

When this fault code is triggered, the Engine Light or Service Engine Soon Warning Light will turn on. The possible causes of this issue include a faulty Fuel Economy Mode Switch, an open or shorted harness, or a poor electrical connection in the circuit.

To fix this problem, you should visually inspect the wiring harness and connectors for any damage.

Look for broken, bent, pushed out, or corroded pins in the connectors.

The repair time for this issue is estimated to be around 1.0 hour.

It is important to address this fault code promptly to ensure optimal performance and fuel efficiency of your vehicle.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

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When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p159f fault code.

  • The symptoms of the automobile fault code p159f include the Engine Light being ON and the Service Engine Soon Warning Light being illuminated.

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The automobile fault code p159f can be caused by a faulty Fuel Economy Mode Switch, an open or shorted harness, or a poor electrical connection in the circuit.

  • The fault code P159F can be caused by the following: a faulty Fuel Economy Mode Switch, an open or shorted harness for the Fuel Economy Mode Switch, and a poor electrical connection in the circuit of the Fuel Economy Mode Switch.

To fix the automobile fault code p159f, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p159f, you need to follow these steps: 1.
  • Check the possible causes mentioned above.
  • 2.
  • Visually inspect the wiring harness and connectors related to the fault code.
  • 3.
  • Look for any damaged components.
  • 4.
  • Check for broken, bent, pushed out, or corroded pins in the connectors.
  • 5.
  • Repairing this fault code is estimated to take approximately 1.0 hour.

The automobile fault code p159f has an estimated repair time of 1.0 hour. Auto repair shops typically charge between $75 and $150 per hour for this type of repair.

The P159F fault code refers to a problem with the Fuel Economy Mode Switch Circuit’s low voltage. The Engine Control Module (ECM) supplies a 5 V reference voltage to the fuel economy mode switch. This voltage causes current to flow through resistors in the switch to the switch ground circuit.

The ECM monitors the reference voltage through a signal circuit.

When the switch button is pressed, the switch contacts allow the voltage to bypass one of the resistors. The resulting voltage drop is detected by the ECM as a fuel economy mode request. This request is then sent to the Transmission Control Module (TCM) and the Instrument Panel Cluster (IPC).

The TCM modifies throttle progressions and transmission shift points to optimize fuel efficiency, while the IPC illuminates the fuel economy mode indicator lamp. To activate the fuel economy mode, the switch must be pressed for a specific duration, between 0.094-1.5 seconds.

What are the possible causes of the automobile fault code p159f?

If you see the engine light on or the service engine soon warning light, the fault code P159F could be the culprit. This code is often caused by a faulty fuel economy mode switch or issues with the switch’s wiring harness. To fix the problem, start by visually inspecting the wiring harness and connectors. Look for any signs of damage or corrosion. Additionally, check for broken, bent, pushed out, or corroded connector pins. By addressing these possible causes, you can resolve the issue and get your automobile back on track.

How can I visually inspect the wiring harness and connectors to fix the p159f fault code?

If you’re dealing with the p159f fault code and notice that your engine light is on, it’s time to take action. The most common cause of this issue is a faulty Fuel Economy Mode Switch or a problem with the harness and connectors. To fix it, start by visually inspecting the wiring harness and connectors. Look for any signs of damage, such as broken or bent pins, corrosion, or components that are out of place. This simple step can help you identify and resolve the issue quickly.

What should I look for when checking for damaged components and connector’s pins to resolve the p159f fault code?

When resolving the p159f fault code, start by checking for damaged components and connector’s pins. This can be done by visually inspecting the related wiring harness and connectors. Look for any signs of damage such as broken, bent, pushed out, or corroded pins. By doing so, you can identify any issues with the Fuel Economy Mode Switch or its circuit connections. This will help you pinpoint the cause of the fault code and take the necessary steps to fix it.

p159f error fault code explained

If you see the Engine Light ON or the Service Engine Soon Warning Light, it could be due to a faulty Fuel Economy Mode Switch.

To fix this, visually inspect the wiring harness and connectors for any damage.

Also, check for broken, bent, pushed out, or corroded connector pins.

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