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 intake air in cold conditions, aiding combustion. A high circuit condition typically means the voltage is above the expected range, often due to a short to power, faulty relay, or damaged wiring.
01. Most Common Causes
- Short to power in the intake air heater circuit
- Faulty intake air heater relay
- Damaged wiring or connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Hard starting in cold weather
- Rough idle or poor performance
- Increased emissions
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the intake air heater circuit for damaged wiring or loose connectors.
Step 3: Test the heater relay and circuit voltage with a multimeter.
Step 4: Check for shorts to power or ground in the wiring harness.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive, but you may experience hard starting in cold weather and reduced fuel economy. Repair promptly to avoid further issues.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts and labor, depending on the cause and vehicle model.