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P0540

Overview

Code

P0540

Code Type

P

Code Class

P0

System

Engine

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0540 indicates an intake air heater circuit malfunction

Symptoms

Hard cold starts

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Cold start air heating system

Possible Causes

Intake air heater failure

Diagnostic Steps

1 Test heater resistance; 2 Inspect relay and wiring

Drive Safety Notes

Cold start performance reduced

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