P0640 OBD-II: Intake Air Heater Control Circuit
P0640 Severity
Will P0640 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.
What causes OBD-II fault code P0640?
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 P0640.
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OBD II Fault Code
- OBD II P0640
OBD-II Code Hard or no start in cold weather is defined as a Intake Air Heater Control 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 P0640.
Hard or no start in cold weather Symptoms
- Hard or no start in cold weather
Common Problems That Trigger the P0640 Code
- Faulty intake air heater relay
- Glow plug control module failure
- Intake air heater
- Powertrain Control Module (PCM) failure
- Wiring issue
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