The P2604 OBD-II code indicates a problem with the Intake Air Heater circuit, which plays a key role in warming up the air entering the engine during cold starts. This code is typically triggered when the Engine Control Module (PCM) detects a failure in the Intake Air Heater or its associated wiring.
What Does the P2604 Code Mean?
The P2604 code signifies that there is a range/performance issue with the Intake Air Heater “A” circuit. The Intake Air Heater is responsible for heating the air entering the engine to ensure proper combustion during cold weather conditions. When the PCM identifies a malfunction in this system, it sets the P2604 code.
What Causes the P2604 Code?
Several factors can lead to the P2604 code being triggered, including:
- Failure of the Intake Air Heater
- Issues with the Powertrain Control Module (PCM)
- Wiring or connection problems related to the heater circuit
What Are the Symptoms of the P2604 Code?
Drivers may notice a few symptoms when the P2604 code is present:
- Check Engine Light illuminated
- Difficulty starting the engine in cold weather
- Decreased fuel efficiency
- Possible rough engine idle during startup
How Serious Is the P2604 Code?
The P2604 code is considered to have moderate severity. While it may not pose an immediate threat to vehicle safety or functionality, it is advisable to address the issue promptly to avoid potential long-term damage to engine components.
How to Diagnose the P2604 Code
Diagnosing the P2604 code typically involves the following steps:
- Use an OBD-II scanner to confirm the presence of the code.
- Inspect the Intake Air Heater and its wiring for any visible damage or disconnections.
- Test the heater circuit for continuity and resistance.
- Check the PCM for any updates or faults that could affect the heater circuit.
Common Repairs for the P2604 Code
Common repairs to resolve the P2604 code may include:
- Replacing the Intake Air Heater
- Repairing or replacing damaged wiring or connectors
- Reprogramming or replacing the PCM if it is found to be faulty
How Much Does It Cost to Fix the P2604 Code?
The cost to fix the P2604 code can vary depending on the specific issue and labor costs in your area. Generally, repairs can range from $100 to $600, with the most significant expense typically related to replacing the Intake Air Heater or the PCM.
Can I Fix the P2604 Code Myself?
If you have experience with automotive repairs and the necessary tools, some aspects of the diagnosis and repair can be done yourself, such as inspecting wiring and replacing the Intake Air Heater. However, for more complex issues involving the PCM, it may be best to consult a professional mechanic.
