Intake Air Heater Temperature Signal Circuit.
Table of contents
P154D 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 P154D 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.
Cost of diagnosing the P154D GMC code
The cost of diagnosing the P154D 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)
P154D 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). Power to the IAH is supplied by the battery positive voltage circuit. The IAH is connected to the GPCM by the following circuits. If there is a fault on any of these circuits a DTC will set.
– 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