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P0064 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


A failure in the control circuit on the intake air heater “A” is mentioned by the P0064 DTC code. Vehicles equipped with OBDII systems, which monitor the performance of various components, including an air intake heater, are frequently found to have this code.


According to the P0064 code, an issue with the control circuit of the intake air heater “A” has been detected by the electronic control module ECM. In order to improve engine performance during cold starts, the intake air heater shall be responsible for preheating the exhaust gases entering the engine.


The P0064 DTC code may be brought on by a number of probable factors, including:

  • A faulty intake air heater relay might prevent the control circuit for the intake air heater from operating correctly.
  • Wire problems: Corroded, loose, or damaged wire and connections might break the circuit and result in a code.
  • Open or short circuit: The P0064 error code may be set off by any open or short circuit inside the intake air heater control circuit.
  • ECM failure: On occasion, a malfunctioning ECM may misidentify a problem and set off the code.


Common symptoms associated with the P0064 DTC code may include:

  • Illuminated check engine light (MIL)
  • Engine hesitation or rough idling during cold starts
  • Reduced engine performance during cold starts
  • Decreased fuel efficiency during cold starts


A qualified mechanic will, in most cases, identify the P0064 code using the following steps: 

  • Using a diagnostic scanner, you will be able to obtain the specific problem code. 
  • Inspect the wiring and connectors related to the intake air heater control circuit. 
  • For function testing, test the air intake heater relay. 
  • Verify the ECM’s functionality, as well as potential communication problems.

Common mistakes

It is important to avoid these frequent mistakes while handling the P0064 DTC code: 

  • Omitting to take into account the additional codes or issues that may have arisen in parallel. 
  • Replacing the intake air heater relay without proper testing to confirm its failure. – Overlooking wiring and connector problems, which may be the root cause of the issue.

How serious is this?

While the P0064 code may not lead directly to serious consequences, it can have an effect on engine performance and fuel efficiency during colder starts. If this issue is not addressed, there may be a reduction in performance and an increase in fuel consumption over time. In the interest of avoiding any further complications, this code is to be addressed as soon as possible.

What repairs can fix the code?

repair manuals

Potential repairs may be as follows to fix the P0064 DTC code: 

  • If it does not test, replace the defective air intake heater relay. 
  • In connection with the air intake heater control circuit, repair or replace worn-out wires and connectors. 
  • Addressing any open or short circuits in the circuit. 
  • In rare cases, if diagnosed as a cause, replacement of the defective ECM.

Related codes

Other related codes that may be encountered alongside or instead of P0064 include:

  • P0061: Intake Manifold Air Control System – Bank 2
  • P0062: Intake Manifold Air Control System – Bank 2, Low Voltage
  • P0063: Intake Manifold Air Control System – Bank 2, High Voltage


A malfunction in the “A” control circuit of the air intake heater is indicated by the P0064 DTC code. You will have an edge in tackling this problem efficiently because you’re able to understand its purpose, cause, symptoms, diagnosis procedures, common mistakes, severity, possible repairs, and associated codes. It is recommended that the P0064 DTC code be properly diagnosed and resolved by a qualified mechanic if you are not sure or in need of assistance.

P0064 Code – What Does It Mean & How To Fix It