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 voltage is too low, often due to a faulty heater element, damaged wiring, or a poor electrical connection.
1. Most Common Causes
- Short to ground in the intake air heater 'B' circuit wiring
- Increased internal resistance or open circuit in the intake air heater 'B' element
- Corroded, loose, or damaged connector or terminal in the heater circuit
- Faulty intake air heater control relay
- Defective engine control module (ECM/PCM) monitoring the circuit
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or poor cold start performance
- Increased emissions
- Possible reduced fuel economy
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 connector and wiring for damage or corrosion.
Step 3: Measure resistance of the heater element; compare to manufacturer specifications.
Step 4: Check voltage at the heater connector with the ignition on; should be near battery voltage.
Step 5: Test the relay and fuse for the intake air heater circuit.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but cold start performance may be poor and emissions could increase. It's best to repair promptly to avoid potential drivability issues.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether the heater element, wiring, or relay needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.