P2604 Fault Code

Intake Air Heater A Circuit Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2604 fault code indicates an issue with the Intake Air Heater A Circuit, which is responsible for heating the intake air to improve cold starts and overall engine performance. When this circuit has a range or performance problem, it can lead to difficulties in engine starting or increased emissions.

• This code is often triggered when the Engine Control Module (ECM) detects that the temperature of the air intake does not match the expected parameters set by the manufacturer.
• The heater element may not be functioning correctly, or there could be a problem with the wiring or connectors in the circuit.

What are the symptoms of the P2604 code?

Symptoms associated with the P2604 fault code can vary, but may include:

• Difficulty starting the engine, especially in cold weather
• Rough idling or unstable engine performance during initial startup
• Increased exhaust emissions
• Check Engine Light illuminated on the dashboard

What causes the P2604 code?

Common causes of a P2604 code include:

• Faulty intake air heater element
• Open or shorted heater circuit wiring
• Poor electrical connections in the circuit
• Malfunctioning Engine Control Module (ECM)
• Blown fuses related to the intake air heating system

How to fix P2604?

To resolve a P2604 fault code, the following steps should be taken:

1. Inspect the intake air heater circuit for damaged wiring, loose connections, or blown fuses.
2. Test the intake air heater element for proper functionality; replace if necessary.
3. Check the ECM for software updates or faults; reprogram or replace if needed.
4. Clear the fault code and perform a road test to ensure the issue is resolved and the code does not return.