P0640 Chevrolet Code - Intake Air Heater 'A' Control Circuit
Quick Answer
The Engine Control Module (ECM) uses an Intake Air Heater (IAH) to warm the incoming air for proper cylinder combustion. Common causes include Faulty Intake Air Heater (IAH) Relay, Faulty Intake Air Heater, Intake Air Heater Relay harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0640 Chevrolet indicates Intake Air Heater 'A' Control Circuit.
- Common causes
- Common causes include Faulty Intake Air Heater (IAH) Relay, Faulty Intake Air Heater, Intake Air Heater Relay harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0640 Chevrolet Description
What are the Possible Causes of the DTC P0640 Chevrolet?
- Faulty Intake Air Heater (IAH) Relay
- Faulty Intake Air Heater
- Intake Air Heater Relay harness is open or shorted
- Intake Air Heater Relay circuit poor electrical connection
- Intake Air Heater harness is open or shorted
- Intake Air Heater circuit poor electrical connection
How to Fix the DTC P0640 Chevrolet?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0640 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0640 Chevrolet Code
1. What are the common symptoms of OBDII code P0640 for Chevrolet related to the Intake Air Heater 'A' Control Circuit?
The common symptoms include the Check Engine Light being illuminated, reduced engine performance, and potential issues with starting the vehicle in cold weather.
2. What are the possible causes of OBDII code P0640 in a Chevrolet vehicle?
Possible causes include a faulty intake air heater control circuit, damaged wiring or connectors, a malfunctioning intake air heater relay, or a problem with the powertrain control module (PCM).
3. How can I diagnose the cause of OBDII code P0640 in my Chevrolet?
Diagnosing the issue involves inspecting the intake air heater circuit for any visible damage, checking the wiring and connectors for continuity, testing the intake air heater relay, and using a diagnostic scanner to check the PCM for any faults.
4. Can I drive my Chevrolet with OBDII code P0640 present?
It is not recommended to drive your vehicle with this code present, as it can affect engine performance and potentially cause further damage. It is best to address the issue promptly.
5. How can I repair OBDII code P0640 related to the Intake Air Heater 'A' Control Circuit in my Chevrolet?
Repairing this code may involve replacing a faulty intake air heater control circuit, repairing damaged wiring or connectors, replacing a malfunctioning intake air heater relay, or reprogramming the PCM if necessary.
6. Are there any DIY tips for fixing OBDII code P0640 in a Chevrolet?
DIY tips may include checking and cleaning the intake air heater connections, inspecting the wiring for any visible damage, and ensuring all components related to the intake air heater circuit are properly connected.
7. How much does it usually cost to repair OBDII code P0640 in a Chevrolet at a mechanic or dealership?
The cost of repairing this code can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
8. Will resetting the OBDII code P0640 in my Chevrolet make it go away permanently?
Resetting the code may temporarily turn off the Check Engine Light, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is important to diagnose and repair the root cause of the problem.
9. Can a faulty intake air heater 'A' control circuit impact fuel efficiency in a Chevrolet?
Yes, a faulty intake air heater 'A' control circuit can lead to decreased fuel efficiency as it can affect the combustion process and overall engine performance.
10. Is it safe to continue driving my Chevrolet if the OBDII code P0640 related to the intake air heater 'A' control circuit keeps coming back?
Continuing to drive the vehicle with this recurring issue is not recommended, as it can lead to further damage and potential safety hazards. It is best to have the problem properly diagnosed and repaired.
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