What Does the Engine Code P2607 Mean?

A P2607 engine code means there is low voltage in the intake air heater (B) circuit.
Written by David Ghanizadeh-Khoob
Reviewed by Melanie Reiff
A P2607 engine code means that there is low voltage going through the intake air heater (B) circuit. If you are getting this engine code, there is likely an issue with one or more of the components in your intake air heater system. You should get the exact cause diagnosed and repaired promptly to avoid any unsafe driving conditions.
Diagnostic trouble codes (DTCs) are codes generated by the onboard diagnostics (OBD) system to identify malfunctions in your vehicle. If you have an OBD-II reader, or if you have recently had your computer read, it’s important to know what the codes actually represent.
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What does engine code P2607 mean?

A P2607 engine code means “intake air heater (B) circuit low.” This means that either the intake air heater circuit (specifically, the B circuit) is not receiving sufficient voltage, or the voltage is exceeding the allowed variance. 

What does the intake air heater circuit do?

The intake air heater circuit operates the system that provides warm air to facilitate a diesel engine starting and idling. The engine control module (ECM) will turn on the intake air heater when the engine coolant temperature is below 40°C (104°F). If the resistance in the circuit falls below the manufacturer's programmed range, then the P2607 engine code will be signaled. 
The components of this system include a heating element, relays, a temperature sensor, blowers, air ducts, electrical connectors and wires.
MORE: How to understand car OBD codes

What can cause a P2607 engine code?

The low voltage signal can be caused by a malfunction in any of the components of the intake air heater system. It could be the result of physical, mechanical, or electrical malfunction to any number of components.
The typical causes of a P2607 engine code are:
  • Issues with the heater element relay
  • Damaged connectors
  • A broken heater element
  • Faulty temperature sensor
  • A broken or shorted intake air heater harness
  • A broken or shorted intake air heater relay harness
  • Defective blower motor
  • Restricted or broken air duct
  • Damaged wiring
  • Faulty engine control module (ECM)

How much does it cost to repair?

Diagnosing the issue typically costs one hour of labor, and the average cost of repairing a P2607 engine code is between $200 and $400.
However, this price can vary dramatically depending on which parts require repair. For instance, replacing the entire engine control module could cost upwards of $800. That’s why it’s important to get an accurate diagnosis so you can avoid an unnecessarily expensive repair.

Common symptoms of a P2607 engine code

If your car is showing a P2607 engine code, your
check engine light will turn on
. Depending on what the specific issue is, this may be the only symptom that you experience for a while.
Some common symptoms that you could notice with a defective intake air heater circuit are:
  • Rough idling in cold weather
  • Engine stalling
    while idling 
  • Engine not starting
  • Longer than normal cranking times
Because there are so many possible malfunctions that can cause a P2607, it is recommended that you take your car to a mechanic to inspect all of the components.

How to diagnose the cause of a P2607 engine code

It is important to make sure you identify which component in the intake air heating system is faulty. A mechanic can help you inspect each component, but if you are going to do it yourself, here are some basic steps to diagnosing the issue.
  • Locate the intake air heater system
  • Check whether the heater element is turning on
  • Check the blower motor
  • Visually inspect the wires for any damage or defects
  • Assess the condition of the air ducts
  • Check electrical connections for corrosion and ensure they are secure
These steps will require a multimeter. The location of the mentioned components and the voltage requirements of the circuit will vary based on the model of your vehicle. More steps will likely be required that are specific to your vehicle and may require more advanced tools and knowledge.

How serious is a P2607 engine code?

A P2607 engine code is usually moderately serious, but can be severe depending on what the specific problem is. It is recommended that you resolve the issue as soon as possible. 
Leaving a P2607 engine code unresolved can lead to unsafe driving conditions because a defective intake air heater circuit can cause your engine to stall on the road.

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