P2604 - OBD Trouble Code

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The trouble code P2604 can be explicated as Intake Air Heater “A” Circuit Range/Performance. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

It is the engine control module which would examine the intake air heater “A” circuit range/performance. This trouble code would be set by the ECM when the intake air heater “A” circuit would not be as per the parameters set by the manufacturer.

What causes this problem with the Intake Air Heater “A” Circuit Range/Performance?

• Malfunctioning heater element relay
• There can be inoperative heater element
• Some issues related to the temperature sensor
• The intake air heater blower might be flawed
• Unusable or restricted air duct
• There can be distorted Blower motor
• Defective PCM

1. Intake Manifold - The primary function of the intake manifold is to evenly distribute the combustion mixture (or just air in a direct injection engine) to each intake port in the cylinder head(s). Even distribution is important to optimize the efficiency and performance of the engine. Thus, replace it now!
2. Engine Control Module - The solenoid might cause a short in the engine control module because of corrosion in the solenoid or the wire running from the solenoid to the ECM harness.
3. Intake Manifold Actuator - The intake manifold actuator assists the intake system in providing correct air flow in the engine cylinder for proper combustion process to take place. The actuator controls the valve and the plates assisting the proper air flow and thus must be replaced, if required. Buy new actuator from us today.
4. Electronic Control Unit - The ECU power management control module keeps in check the hybrid battery charging functions. If the ECU is faulty, the battery pack will not be able to properly get charged and thus, the ECU might need replacement.
5. Intake Valve - Proper functioning of the runner valve is necessary so that the required amount of air can enter the cylinder for optimal air to fuel ratio. If the valve is damaged or not working properly, the can lead to lean or rich engine conditions. Thus, replace faulty valve now!
6. Powertrain Control Module - A trouble with the PCM would mean that it is unable to determine the right fuel mixture and would send the car engine either more or less fuel than it requires. Now when the engine gets more, the carbon emission would increase and fuel economy would drop. In case of the opposite, the engine will choke, stutter, and might start stalling sometimes.
7. Diagnostic Tool - Usually any OBD code problem requires deep insight into the problem and high grade tools in order to fix it properly. Thus, buy quality diagnostic tools form us!

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2604 here:

Common Symptoms

• Illumination in the service engine soon light
• Engine will not begin
• Lengthy cranking time
• Uneven idle at cold temperatures
• Engine blocking

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2604:

• Make sure to mend the faulty wires or other electrical components
• It is essential to restore the flawed PCM/ECM
• Rehabilitate the defaults in the temperature sensor
• Recondition the non-functioning intake air heater blower

Parts Avatar Canada is here to solve all your issues related to car parts. We have stocked a wide range of best priced intake air heater, intake air heater blower, heater element relay, air duct, blower motor, powertrain control module, digital voltmeter, intake air temperature sensor, intake air heater relay, body control module, pcm, ecm and a lot more to help you out in fixing your car.

If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

As a first step in any trouble shooting process, you must search the TSB for your specific vehicle by year, model and power plant. This is very essential as it can save a lot of time by directing in the right path. The intake air heating circuit may not work automatically if the

ambient air or engine temperature is above the limit which is set by the manufacturer. The circuit should activate if it is commanded "ON" with a scanner, or if power is applied manually.

Basic Steps

Inspect the heater element, is it turning "ON" NOTE: Do not touch element or heat shield Make sure to examine the blower motor, is it turning "ON" The circuit connections and wiring for obvious defects should be visually inspected It is essential to visually inspect the condition of the air ducts for obvious defects Examine electrical connections for security and corrosion

Advanced Steps

The advanced steps become very vehicle specific and need the appropriate advanced equipment to perform in the right way. There would be a need of a digital multimeter and the specific technical references to carry out this procedure. Voltage requirements will vary depending upon the specific year, make and model of the vehicle.

Specific Checks:

Specific checks should be performed by utilizing the troubleshooting guidelines for the particular vehicle using the technical manual or online reference material. These steps will guide you through the process of inspecting the power and ground to each component within the intake air heater circuit in the proper sequence. If the voltage is right to a component that is not functioning, then it would mean that the part is most likely faulty and it should be restored. If power is not available to operate the circuit, continuity checks would be required to identify defective wiring or components.

Common Mistakes When Diagnosing The P2604 Code

There are a lot of mechanics who would simply rush into the judgement that the intake air heater is faulty, but they should keep in mind that the repair might have a temporary effect, but then this error code would return again. It is essential to test each and every possibility for why the component is not working properly to make sure it is fixed properly the first time.