P154B GMC - Intake Air Heater Voltage Signal Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

P154B GMC Possible Causes

  • Faulty Intake Air Heater
  • Intake Air Heater harness is open or shorted
  • Intake Air Heater circuit poor electrical connection

How do I fix code P154B GMC?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Cost of diagnosing the P154B GMC code

Labor: 1.0

The cost of diagnosing the P154B GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P154B GMC Description

The Intake Air Heater (IAH) is located in the air inlet tube and is used to warm the incoming air to aid in starting the engine and for proper cylinder combustion. The Glow Plug Control Module (GPCM) will command the IAH ON when the engine coolant temperature is below 40°C (104°F). The IAH is connected to the GPCM by the following circuits:
- The IAH temperature signal circuit
- The IAH command 1 circuit
- The IAH command 2 circuit
- The IAH voltage signal circuit
- The IAH current signal circuit
- The IAH feedback signal circuit
OBDII Code P154b Gmc - Intake Air Heater Voltage Signal Circuit - AutoCodes.com

More Information

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