Skip the auto shop - Our mechanics make house calls

P2607 OBD-II Trouble Code: Intake Air Heater 'B' Circulation Low

check engine light logo

P2607 code definition

The P2607 trouble code is a generic powertrain code related to computer circuit output issues. Your vehicle’s engine control module (ECM) is receiving a notification that the second intake air heater (heater B or 2) is presenting a low voltage reading or is exceeding the manufacturer’s allowed variances.

The P2607 code is also related to:

What the P2607 Code Means

When a P2607 code comes up, your vehicle’s air intake heater B (number 2 intake heater circuit) is not receiving the correct voltage. An intake air heater system works to warm the cooler air coming into the intake system.

The resistance between the signal and return posts of the air intake heater relay should be between 15 and 25 ohms. The resistance of the air intake heater relay signal circuit between the vehicle’s ECM and the intake air heater relay connector should have a resistance less than 10 ohms. If the ECM detects resistance levels lower than these readings, a P2607 code will appear.

What Causes the P2607 code?

  • Damaged or defective intake heater relays located on the passenger side of the battery tray
  • Loose or damaged electrical wires, including damage due to battery acid corrosion.
  • Damaged or defective intake air heater blower
  • Damaged, loose, or defective intake air temperature sensors
  • Damaged, defective, or burned out heater element
  • In rare cases, a damaged or defective ECM

What are the Symptoms of the P2607 Code?

Symptoms of a P2607 trouble code may include:

  • Vehicle warning or Check Engine Light may illuminate, with no other symptoms present
  • Vehicle may fail a smog test
  • Vehicle may stall or shake at idle

How Does a Mechanic Diagnose the P2607 Code?

To diagnose a P2607 code, a mechanic may do one or more of the following:

  • Use an OBD-II scanner to check for a stored P2607 trouble code

  • Perform a visual inspection

  • Check for damaged or defective wires

  • Check battery wires for damage or loose connections

  • Check for any loose electrical connectors or bent pins

  • Check for any grounded wires

  • Connect vehicle to scanner and check if the ECM is commanding the intake air heater to turn on

  • Listen to hear if the blower is working

  • Locate heater element and use an infrared thermometer to check if it is warming

  • Measure resistance between signal and return posts of the intake air heater relay

  • Measure resistance of the intake air heater relay signal circuit between the vehicle’s ECM connector and the intake air heater relay connector

  • Measure the voltage between the signal circuit of the intake air heater and battery negative

  • Check circuit continuity

  • Clear the code and test drive the vehicle to see it reappears (with some makes and models, it requires a few drive cycles with a failure to turn on a warning light)

  • Note: Some vehicle models will allow the mechanic to turn a vehicle’s air intake heater on and off, which is helpful for testing this issue after an engine is warm.

How Serious is the P2607 Code?

Because the vehicle may not show any symptoms for this code except a warning light or failed smog test, but could potentially stall or hesitate at idle causing dangerous driving conditions, YourMechanic considers the P2607 code serious and recommends to take your vehicle to your local service center or mechanic immediately for diagnosis and repair.

What Repairs can Fix the P2607 Code?

  • Replace or repair any damaged or defective wires
  • Replace or repair any damaged or loose connections in the battery wires
  • Replace or repair damaged battery cable
  • Replace or repair a damaged or defective air intake heater B (or number 2) relay
  • Repair the air intake heater ground
  • Replace or repair any damaged or defective temperature sensors
  • Replace or repair any loose electrical connectors or bent pins
  • Replace or repair any grounded wires
  • Replace a damaged or defective heater element
  • Repair or replace damaged or defective intake air heater B
  • Repair or replace a defective or faulty ECM
  • Clear the code and test drive the vehicle to see it reappears (with some makes and models, it requires a few drive cycles with a failure to turn on a warning light)

Need Help with a P2607 Code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...

Related questions

Q: DTC Help Request

You might have a problem with fretting corrosion in the connectors of the modules of the vehicle. There is a technical bulletin out for your Saturn VUE: 09-06-03-004D, dated December 2010 for corrosion in the small connector pins of the...

Q: Evap solenoid system

I applaud your diligence in reading the code and working the specific problem! There is another angle to this issue that I'm sure was next on your list - cleaning (or replacing) the evaporation vent purge valve, which accumulates dust...

Q: What is the best fix for a catalyst system efficiency below threshold (bank 2)

Trouble code P0430 is for a catalyst on the drivers side. The sensor after the converter may be bad and not responsive enough or the catalyst itself may be bad. The catalyst should be replaced if the converter rattles, there...