Code Severity and Symptoms
The severity of this code is normally moderate, but can be severe depending on the specific malfunction.
Symptoms of a P2607 diagnostic trouble code may include:
- Engine does not start
- Longer than normal starting time
- Check engine light illuminated
- Rough idle in cold weather
- Engine stalls
Causes
Generally, potential causes of this code include:
- Faulty heater element relay
- Defective heater element
- Faulty temperature sensor
- Corroded or damaged connector
- Damaged or restricted air duct
- Faulty or damaged wiring
- Faulty blower motor
- Faulty PCM
What are the most common repairs?
- Replacement of the heater element
- Replacement of the temperature sensor
- Replacement of the heater element relay
- Cleaning corrosion from connectors
- Repairing or replacing wiring
- Replacement of damaged air ducts
- Replacement of the blower motor
- PCM replacement
Diagnostic and Repair Procedures
The first step in the troubleshooting process for any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and powertrain. In some circumstances, this can save significant time in the long run by pointing you in the right direction.
The intake air heater circuit may not operate automatically if the ambient air or engine temperature is above the manufacturer’s set limit. The circuit should activate if it is commanded “ON” with a scan tool, or if power is manually applied.
Basic Steps
- Check the heater element, does it turn “ON”
- NOTE: Do not touch the heater element or heat shield
- Check the blower motor, does it turn “ON”
- Visually inspect the circuit connections and wiring for obvious faults
- Visually inspect the condition of the air ducts for obvious faults
- Check electrical connections for security and corrosion
Advanced Steps
Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. Voltage requirements will be highly dependent on the specific vehicle year, model, and diesel engine.
Specific Checks
Note: On applications equipped with mass air flow sensors, the intake air temperature sensor is integrated into the sensor body. Consult technical data to determine the correct pins associated with the sensor.
Specific checks should be performed using the troubleshooting guidelines for the specific vehicle using the technical manual or online reference material. These steps will guide you through the process of checking the power and ground for each component in the intake air heater circuit in the correct order. If voltage is correct for a component that is not functioning, that component is likely faulty and needs replacement. If power is not available to operate the circuit, continuity checks may be necessary to identify faulty wiring or components.
I hope the information in this article has helped point you in the right direction to correct your intake air heater circuit malfunction issue. This article is strictly informational, and technical data and service bulletins specific to your vehicle should always take priority…