Intake Air Heater Circuit Low
The P2607 code indicates that the powertrain control module (PCM) has detected a low voltage condition in the intake air heater circuit. This heater is used to warm the incoming air in cold conditions, aiding combustion and reducing emissions. A low circuit condition typically means the resistance is too high or there is an open or short to ground in the wiring, connector, or the heater element itself. This can lead to poor cold-start performance and increased emissions.
01. Most Common Causes
- Faulty intake air heater element
- Open or shorted wiring in the heater circuit
- Corroded or damaged connector
- Failed relay or fuse
- PCM issue (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Hard starting in cold weather
- Rough idle or misfire during cold start
- Increased emissions
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P2607 and check for other codes.
Step 2: Visually inspect the intake air heater connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the heater element resistance with a multimeter; compare to manufacturer specs (typically 0.5-2 ohms).
Step 4: Check for power and ground at the heater connector with the ignition on; if missing, inspect fuses and relays.
Step 5: If all checks pass, suspect a PCM fault; perform a PCM reset or reprogram if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive, but cold-start performance may be poor, and emissions could increase. It's best to repair soon to avoid potential drivability issues.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the cause. A heater element replacement is usually under $100, while wiring repairs may cost more.