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P0540 — Intake Air Heater A Circuit

Diesel intake air heater (glow plug relay/circuit) fault.

Severity: MediumRepair: $50-$500Difficulty: Medium

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Common symptoms of P0540

Common causes of P0540

Repair cost & difficulty

Typical cost to fix P0540: $50-$500 · Difficulty: Medium

Pro tip: Diesel vehicles use intake air heaters or glow plugs for cold starting. Check relay and glow plugs.

Vehicles commonly affected

Diesel vehicles

Related trouble codes

P0380

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.