Intake Air Heater Circuit High
The P2608 code indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the intake air heater circuit. This heater is used to warm the incoming air in cold conditions to improve combustion and reduce emissions. A high circuit condition typically means there is a short to voltage, a faulty heater relay, or a defective heater element.
1. Most Common Causes
- Short to voltage in the intake air heater circuit
- Faulty intake air heater relay
- Defective intake air heater element
- Damaged wiring or connector
2. Symptoms You Will Notice
- Check Engine Light on
- Poor engine performance in cold weather
- Increased emissions
- Possible hard starting in cold conditions
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the intake air heater wiring and connector for damage or corrosion.
Step 3: Test the intake air heater relay and circuit for shorts to voltage using a multimeter.
Step 4: Check the resistance of the heater element; if out of spec, replace the heater.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive, but the vehicle may experience poor performance and increased emissions, especially in cold weather. It's best to repair it promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts and labor, depending on the specific cause and vehicle model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.