P0543 OBD-II: Intake Air Heater "A" Circuit Open

P0543 Severity

Moderate

Will P0543 go away on its own?

Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.

For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.

Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.

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What causes OBD-II fault code P0543?

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 P0543.

OBD II Fault Code

OBD II P0543

OBD-II Code Hard or no start in cold weather is defined as a Intake Air Heater "A" Circuit Open

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 P0543.

Hard or no start in cold weather Symptoms

Hard or no start in cold weather

Common Problems That Trigger the P0543 Code

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

OBD Code Resources

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OBD II Fault Code

OBD II P0543

OBD-II Code Hard or no start in cold weather is defined as a Intake Air Heater "A" Circuit Open

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 P0543.

Hard or no start in cold weather Symptoms

Hard or no start in cold weather

Common Problems That Trigger the P0543 Code

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

P0543 OBD-II: Intake Air Heater "A" Circuit Open

Will P0543 go away on its own?

What causes OBD-II fault code P0543?

Need a P0543 diagnosis? Trust our experts.

OBD II Fault Code

Hard or no start in cold weather Symptoms

Common Problems That Trigger the P0543 Code

OBD Code Resources

Need a P0543 diagnosis? Trust our experts.

Ask our experts about P0543.

Other OBD-II Codes

OBD II Fault Code

Hard or no start in cold weather Symptoms

Common Problems That Trigger the P0543 Code