[SOLVED] P154C Code: Fixing Intake Air Heater Current Signal Circuit Issue

The automobile fault code P154C indicates a problem with the Intake Air Heater.

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

The cause of this issue could be 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 for this fault code is estimated to take around 1.0 hour. To interpret the fault code, refer to the “Possible Causes” listed above.

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

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p154c fault code.

  • The symptoms of the automobile fault code p154c include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p154c 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 p154c 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.

To fix the automobile fault code p154c, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p154c, 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 p154c can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of the repair will depend on the hourly rate charged by the auto repair shop, which typically ranges between $75 and $150 per hour.

The P154C fault code refers to a problem with the Intake Air Heater (IAH) current signal circuit in your vehicle. The IAH is responsible for warming the incoming air to assist with engine starting and cylinder combustion. The Glow Plug Control Module (GPCM) activates the IAH 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 P154C fault code will be triggered.

To resolve this issue, it is recommended to have a professional mechanic or technician diagnose and repair the specific circuit that is causing the fault. They will be able to identify the exact cause of the problem and perform the necessary repairs or replacements to ensure the IAH functions properly.

What are the possible causes of fault code p154c and how can I visually inspect them?

If you’re seeing the engine light or service engine soon warning light and have fault code P154C, it could be due to 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 these possible causes, check the wiring harness and connectors for any damage. Look out for broken, bent, pushed out, or corroded pins on the connectors. This will help you identify and fix the issue.

How does a faulty intake air heater contribute to the engine light being on?

When the engine light is on, it could be due to a faulty intake air heater. This can happen if the intake air heater harness is open or shorted, or if there is a poor electrical connection in the intake air heater circuit. To fix this issue, you should visually inspect the wiring harness and connectors, checking for any damage or broken pins. It’s important to address these possible causes to resolve the problem and turn off the engine light.

What steps can I take to fix fault code p154c and ensure a proper electrical connection in the intake air heater circuit?

To fix fault code p154c and ensure a proper electrical connection in the intake air heater circuit, start by visually inspecting the wiring harness and connectors. Look for any damage or signs of wear. Check for broken, bent, pushed out, or corroded connector pins. Address any issues found during the inspection. This will help resolve the faulty intake air heater and any poor electrical connections.

p154c error fault code explained

If your engine light is on, it could be due to a faulty intake air heater or issues with the wiring harness and connectors.

To fix this, visually inspect the wiring and connectors for any damage. Look out for broken, bent, pushed out, or corroded pins on the connectors.

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