P2609 OBD-II Trouble Code: Intake Air Heater System Performance

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2609 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2609 code

P2609 is a diagnostic trouble code (DTC) for "Intake Air Heater System Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $69.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$69.99$20.00
Toyota$69.99$20.00
BMW$69.99$20.00
SCHEDULE P2609 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light logo

P2609 code definition

A P2609 trouble code indicates that the PCM has detected abnormal voltage readings from one or more of the intake air heater circuits. This particular trouble code is most often associated with trouble codes P2604, P2605, P2606, P2607, and P2608.

What the P2609 code means

A P2609 OBD-II trouble code means that the variation in the voltage to one or more of the intake air heater circuits has exceeded the manufacturer's stipulated levels. The resulting stored code results in an illuminated Check Engine light, though some models of vehicles might require multiple drive cycles, at least three, before the Service Engine Soon Light will illuminate.

What causes the P2609 code?

The most common cause of a P2609 trouble code is a faulty intake air heater relay. Some other causes of this trouble code include:

  • Shorted or open connectors or wiring.
  • A burnt out heater element.
  • A bad intake air heater blower.
  • A faulty, or disconnected, intake air temperature sensor.
  • A faulty PCM, though this is rare.

What are the symptoms of the P2609 code?

Symptoms of a P2609 OBD-II trouble code include:

  • A code stored to the PCM.
  • An illuminated Check Engine light.

How does a mechanic diagnose the P2609 code?

In order to properly diagnose a P2609 trouble code, a mechanic needs an advanced scanner or code reader, a digital volt/ohmmeter, and an infrared thermometer with a laser pointer. To successfully diagnose a P2609 trouble code, a mechanic should take the following steps:

  • Visually inspect all wiring and connectors in the intake air heater system.

  • Replace any damaged, shorted, or disconnected wiring and connectors. If any of the components appear to be damaged, replace those as well.

  • Retest the system after repairing or replacing any wiring, connectors, or components. A mechanic can do this by connecting the advanced scanner to the diagnostic connector and recording all stored codes.

  • To diagnose a component such as the heater blower of heating element, crank the cold engine with the advanced scanner attached.

  • Watch to see if the scanner data shows that the intake air heater is given a command of On by the PCM.

  • If On, can you hear the blower operating?

  • Once you are sure that the blower is operating, find the heating element to make sure that it is warming properly.

  • Next, check the intake air heater relay with the digital volt/ohmmeter to make sure that the relay is grounded at the electrical connector.

  • If the voltage readings don't comply with the manufacturer's specifications, the mechanic needs to disconnect the PCM and perform further testing using the digital volt/ohmmeter.

Common mistakes when diagnosing the P2609 code

While some mechanics might only attribute a P2609 trouble code to a faulty intake air heater relay, they should keep in mind that this is not the only cause of this particular trouble code. Some other potential causes can include PCM failure, though this is rare. In addition, a short in the wiring or connectors, a burnt out heater element, a faulty or disconnected intake air temperature sensor, or a bad intake air heater blower can all lead to the Check Engine light illuminating and a stored P2609 trouble code.

How serious is the P2609 code?

A P2609 trouble code is usually not very serious unless it is associated with one of the other parts of the intake air heater systems, most specifically a burnt out heater element, faulty PCM, or a bad intake air heater blower. In these instances, in addition to the storage of a relevant trouble code or codes and the illumination of the Check Engine light, the faulty part can also cause the intake air heater system to not function properly. A short in the wiring or connectors can also cause this system not to function as it should, leading to a decrease in fuel efficiency.

What repairs can fix the P2609 code?

To repair and clear a P2609 trouble code, a mechanic must first:

  • Replace any shorted, damaged, or disconnected wiring and connectors.

  • Repair any components that need replacement.

  • Once the components, wiring, and connectors have been replaced, the mechanic needs to clear the trouble codes and perform a test drive to ensure that the problem has been fixed.

Additional comments for consideration regarding the P2609 code

Keep in mind that a P2609 trouble code might not always be stored in the PCM when the problem occurs. A P2609 trouble code might require the vehicle to go through up to three cycles before storing the code in the PCM. Diagnosing such a code is helped by recording all stored codes and freeze frame data using the advanced scanner.

Need help with a P2609 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.

trouble codes
Check Engine Light
P2609

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2609 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,150

Rating Summary
3,799
173
45
26
107
3,799
173
45
26
107
Diego

Diego

18 years of experience
252 reviews
Diego
18 years of experience
Great
1993 OLDSMOBILE CUTLASS CIERA - CHECK ENGINE LIGHT IS ON - AVONDALE, ARIZONA
Tien

Tien

20 years of experience
746 reviews
Tien
20 years of experience
Very knowledgeable and excellent service.
2008 AUDI A3 - CHECK ENGINE LIGHT IS ON - BERKELEY, CALIFORNIA
Richard

Richard

10 years of experience
419 reviews
Richard
10 years of experience
Richard was knowledgeble, courteous and thorough.
2004 BMW X3 - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA
Jerel

Jerel

8 years of experience
125 reviews
Jerel
8 years of experience
I was a little nervous about the whole thing at first but he was great! Got here 30 mins early, jumped right on it and figured out exactly what the problem was! I will definitely be using him again in the future.
2000 FORD FOCUS - CHECK ENGINE LIGHT IS ON - DURHAM, NORTH CAROLINA

More related articles

Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P0608 OBD-II Trouble Code: Control Module VSS Output "A" Malfunction
P0608 means there is an malfunction in the vehicle speed sensor A control module often due too faulty speed sensor or shorted electrical wiring.

Related questions

Q: ABS, ESP, EBR malfunction

You're getting into an area that is kind of a dark art when you're getting these kinds of codes. While I don't know any of the symptoms that the car is exhibiting, I can tell you that failure in one...

Q: Does the OBD System Measure Gases in the Car's Exhaust?

The onboard diagnostic (OBD) system utilizes sensors mounted in the engine exhaust stream to measure the amount of oxygen that comes out of the engine after the combustion process. When an engine intakes a certain amount of air into the...

Q: Code P02A9 Cylinder 4 Balance-Fuel Trim at Limit

The code definition specifically indicates the number four fuel injector is leaking. Fuel trims are used to indicate how much the PCM (powertrain control module) needs to adjust the fuel duty cycle to maintain the proper air fuel ratio. Duty...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com