P2607 Intake Air Heater B Circuit Low
Content
P2607 Intake Air Heater B Circuit Low
OBD-II DTC Datasheet
Intake Air Heater "B" Circuit Low
What does this mean?
This Generic Transmission Diagnostic Trouble Code (DTC) typically applies to all OBD-II equipped vehicles with an air intake, including but not limited to Chevrolet GMC (Duramax), Ford (Powerstroke), Honda, Nissan, Dodge, etc.
This code is one of a number of possible codes associated with a malfunction in the intake air heater "B" circuit. The intake air heater is an important component of a diesel engine that aids the starting process. The four codes that the powertrain control module (PCM) can set for "B" intake air heater circuit problems are P2605, P2606, P2607, and P2608.
What is an air intake for?
The intake air heater “B” circuit is designed to operate components that provide warm air to facilitate diesel engine starting and idling at various temperatures. A typical intake air heater circuit includes a heating element, relay, temperature sensor, and at least one fan. Air ducts are also needed to direct warm air towards the intake, and electrical connections and wiring control these components.
DTC P2607 is set by the PCM when the signal from the "B" intake air heater circuit is low. The circuit may be out of range, contain a faulty component, or have incorrect airflow. Various faults can be present in the circuit, which can be physical, mechanical or electrical. Consult your specific vehicle repair manual to determine which "B" circuit is for your specific vehicle.
Here is an example of an air intake: 
Code severity and symptoms
The severity of this code is usually moderate, but it can be serious depending on the specific problem.
Symptoms of the P2607 DTC may include:
- The engine will not start
- More than usual startup time
- Check Engine light is on
- Rough idle at low temperatures
- Engine stalls
reasons
Typically, potential causes for this code include:
- Defective heating element relay
- Detective heating element
- Defective temperature sensor
- Corroded or damaged connector
- Damaged or restricted air duct
- Faulty or damaged wiring
- Faulty fan motor
- Defective PCM
Different air intake style: 
What are the most common types of repairs?
- Replacing the heating element
- Replacing the temperature sensor
- Replacing the heating element relay
- Cleaning connectors from corrosion
- Repair or replacement of wiring
- Replacing damaged air ducts
- Replacing the blower motor
- Flashing or replacing PCM
Diagnostic and repair procedures
The first step in troubleshooting any problem is to review the vehicle-specific Technical Service Bulletins (TSBs) by year, model, and powerplant. In some cases, this can save you a lot of time in the long run by pointing you in the right direction.
The intake air heating circuit may not operate automatically if the ambient air or engine temperature is above the manufacturer's limit. The circuit should be activated if it is commanded ON from the scanner or if power is applied manually.
Basic steps
- Check the heating element to see if it turns on. NOTE: Do not touch the element or heat shield.
- Check the blower motor to see if it turns on.
- Visually inspect chain connections and wiring for obvious defects.
- Inspect the condition of the air ducts for obvious defects.
- Check electrical connections for safety and corrosion.
Advanced steps
The additional steps become very vehicle specific and require appropriate advanced equipment to be performed accurately. These procedures require a digital multimeter and vehicle-specific technical reference documents. Voltage requirements will depend on the specific year of manufacture, model and diesel engine in the vehicle.
Special checks:
Note. In MAF applications, the intake air temperature sensor is integrated into the sensor housing. Refer to the datasheet to determine the correct pins associated with the sensor.
Specific checks should be performed using vehicle-specific troubleshooting recommendations using a technical manual or online reference materials. These steps will guide you through the process of checking the power and grounding of each component in the intake air heater circuit in the correct sequence. If the voltage matches a non-functioning component, it is most likely that the component is defective and needs to be replaced. If there is no power to operate the circuit, a continuity check may be required to identify faulty wiring or components.
Hopefully the information in this article has helped point you in the right direction for solving your problem with a malfunctioning intake air heater circuit. This article is for informational purposes only and specific technical data and service bulletins for your vehicle should always take priority.
Related DTC discussions
- Dodge 2500 Year 2003 Diesel Cumins Codes P0633 P0541 P2607Hey guys: My truck is a 2003 Dodge Diesel 2500. There are codes that have appeared. The truck will roll over but won't start. We scanned it ourselves and the codes are: P0633 - Key not programmed. P0541 - low voltage, air intake relay #1, third code - P2607 - don't know what this number is ...
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NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.
