Skip the auto shop - Our mechanics make house calls

P2605 OBD-II Trouble Code: Intake Air Heater A Circuit

Check Engine Light

P2605 code definition

The P2605 code gets stored when the PCM detects an irregular voltage reading originating from a certain intake air heater circuit.

What the P2605 code means

Voltage variations that fall outside of the parameters set forth by the manufacturer will trigger a stored code and, usually, a Check Engine Light. However, some vehicles will hold off on the Check Engine Light until there have been multiple (usually three) drive cycles that registered this problem.

Your vehicle’s intake air heater system warms air that enters the engine intake system so it can be put to the most efficient use. In order to do this, the intake heater system needs various electrical components to heat the air.

What causes the P2605 code?

The most common reason for a P2605 code to be stored is that your intake heater relay has become faulty.

Other causes include:

  • Open or shorted wires
  • Open or shorted connectors
  • An intake air temperature sensor that is broken or disconnected
  • A faulty intake air heater blower
  • The heater element has burned out
  • The PCM isn’t working correctly (very rare)

What are the symptoms of the P2605 code?

There aren’t really any symptoms associated with this code that most drivers would notice. Aside from the Check Engine Light we mentioned above, you probably won’t be aware of your vehicle acting any differently, though your engine may actually be underperforming.

How does a mechanic diagnose the P2605 code?

Your mechanic will use a scanner to retrieve whichever codes have been stored by your PCM. They’ll most likely use an ohmmeter and an infrared thermometer with a laser too. To begin with, they’ll examine wires and connectors and then use the scanner and record all freeze frame data and stored codes. After that, they’ll take the vehicle for a test drive to see if the code returns.

If the problem is still present, the mechanic will connect the scanner and crank the engine to see if the PCM commands the intake air heater to turn “ON.” They’ll then inspect the heating element to see if it’s finally warming up. Lastly, if the heating element remains cold, it will be time to check power sources for problems.

Common mistakes when diagnosing the P2605 code

If a mechanic rushes to judgment about the intake air heater’s problem – generally oversimplifying it – the repair may have a temporary effect, but the P2605 code will return. Each possibility for why the component isn’t working must be tested to make sure it’s fixed properly the first time.

How serious is the P2605 code?

The problems behind this code really aren’t that serious. However, it is worrisome that your vehicle probably won’t be performing as well as you’re used to without your noticing until the Check Engine light comes on. So although your safety won’t be at risk because the intake air heater system isn’t working correctly, it will cost you in performance and therefore getting it fixed should still be treated as a priority.

What repairs can fix the P2605 code?

The most common ways to fix the P2605 code are:

In very rare cases, it may be necessary to replace your vehicle’s PCM.

Additional comments for consideration regarding the P2605 code

Always be careful when testing the temperature of the heating element. Once it’s fixed, it may all of a sudden heat up quickly and burn you. This is why an infrared thermostat that uses a laser is so helpful – you can test for heat without putting yourself at risk.

Need help with a P2605 code?

To speak with a service advisor about P2605 code and how YourMechanic can help, just call 1-800-701-6230 or book an appointment with us online. We’ll provide you with a quote ASAP and schedule a time when one of our certified mobile mechanics can work on your car. They can meet you at your home or place of business and carry out the repairs on the spot!

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

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.

GET A QUOTE

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...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...


Related questions

Q: Engine problems.

Hello. From what you describe it would appear likely that the backfiring and performance issues are a result of the fuel problem. A rich fuel mixture can be caused by a wide variety of issues. A few things I would...

Q: Code P0016

The OBD-II error code P-0016 is a generic code that indicates that the camshaft position sensor for bank one does not correlate to the signal from the crankshaft position sensor. Some of the common trigger points that create this code...

Q: cylinder misfire

There seems to be a variety of symptoms going on at the same time. Addressing the ticking issue, it could be your lifters, and it could also be your fuel injectors. This could be part of the problem when it...