[SOLVED] P154D Code: Fix Intake Air Heater Temperature Signal Circuit Issue!

The automobile fault code P154D indicates a problem with the Intake Air Heater.

When this fault code appears, the Engine Light or Service Engine Soon Warning Light will turn on.

The possible causes for this issue include a faulty Intake Air Heater, an open or shorted Intake Air Heater harness, or a poor electrical connection in the Intake Air Heater circuit. To fix this problem, you should visually inspect the wiring harness and connectors, checking for any damage or corrosion.

Additionally, look for any broken, bent, pushed out, or corroded pins in the connectors.

The repair time for this issue is estimated to be around 1.0 hour. By addressing this fault code promptly, you can ensure the proper functioning of your vehicle’s Intake Air Heater.

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

When the p154d fault code appears, you may notice the Engine Light ON or the Service Engine Soon Warning Light illuminated.

  • The symptoms of the automobile fault code p154d include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

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The automobile fault code p154d can be caused by a faulty intake air heater, an open or shorted intake air heater harness, or a poor electrical connection in the intake air heater circuit.

  • The fault code p154d can be caused by: a faulty intake air heater, an open or shorted intake air heater harness, and a poor electrical connection in the intake air heater circuit.

To fix the automobile fault code p154d, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p154d, 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.
  • The estimated repair time for this fix is 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p154d are the estimated repair time of 1.0 hour and the hourly rate charged by auto repair shops, which typically ranges between $75 and $150.

The P154D fault code refers to a problem with the Intake Air Heater (IAH) temperature signal circuit in your vehicle.

The IAH is responsible for warming the incoming air to aid in starting the engine and ensuring proper cylinder combustion. The Glow Plug Control Module (GPCM) commands the IAH to turn on when the engine coolant temperature is below 40°C (104°F). The IAH is connected to the GPCM through various circuits, including the temperature signal circuit, command 1 circuit, command 2 circuit, voltage signal circuit, current signal circuit, and feedback signal circuit.

If there is a fault detected in any of these circuits, the P154D fault code will be triggered. This code indicates that there is an issue with the temperature signal circuit of the IAH. It is important to address this issue promptly to ensure optimal engine performance and efficiency.

What are the possible causes for the automobile fault code p154d?

If you see the engine light or service engine soon warning light on, the fault code P154D could be the culprit. This code is often caused by a faulty intake air heater, an open or shorted intake air heater harness, or a poor electrical connection in the intake air heater circuit. To fix this issue, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins. Don’t forget to check the possible causes listed above for a more comprehensive solution.

How can I visually inspect the wiring harness and connectors to fix the issue?

To fix the issue of the Engine Light being ON or the Service Engine Soon Warning Light, start by checking the possible causes, which include a faulty Intake Air Heater, an open or shorted Intake Air Heater harness, or a poor electrical connection in the Intake Air Heater circuit. To visually inspect the problem, examine the wiring harness and connectors. Look for any damaged components and check for broken, bent, pushed out, or corroded pins in the connectors. This thorough inspection will help identify and resolve the issue effectively.

What should I look for when checking for damaged components or corroded connector pins?

When troubleshooting an engine light or service engine soon warning light, it’s important to check for damaged components and corroded connector pins. These issues can be the cause of a faulty intake air heater or poor electrical connection in the intake air heater circuit. To fix the problem, visually inspect the wiring harness and connectors, paying close attention to any signs of damage. Look for broken, bent, pushed out, or corroded pins on the connectors.

p154d error fault code explained

If you’re seeing the Engine Light ON or the Service Engine Soon Warning Light, it could be due to a faulty Intake Air Heater. To fix this, visually inspect the wiring harness and connectors for any damage.

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

Take action now to prevent further issues.

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