P0540 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0540 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0540 code.

What Does P0540 Code Mean?

OBD-II Code P0540 is defined as a Intake Air Heater "A" Circuit

The Intake Air Heater warms the air going into the engine on cold startups. If the engine control module (PCM) detects a failure in the Intake Air Heater or its wiring, it will set code P0540.

P0540 Symptoms

• Hard or no start in cold weather

Common Problems That Trigger the P0540 Code

• Intake air heater
• Powertrain Control Module (PCM) failure
• Wiring issue