P2604 – BMW DTC

BMW DTC P2604 – Intake Air Heater ‘A’ Circuit Range/Performance

DTC P2604 meaning on BMW

DTC P2604 on a BMW indicates an issue with the Intake Air Heater ‘A’ circuit. This code is triggered when the Engine Control Module (ECM) detects that the intake air heater circuit is operating outside of its normal range or performance parameters.

BMW DTC P2604 symptoms

Symptoms of DTC P2604 on a BMW may include:

• Check Engine Light illuminated
• Reduced engine performance
• Possible rough idling or stalling

BMW DTC P2604 causes

The common causes of DTC P2604 on a BMW include:

• Faulty intake air heater ‘A’
• Wiring or connector issues in the intake air heater circuit
• Defective Engine Control Module (ECM)

BMW DTC P2604 seriousness

While DTC P2604 may not cause immediate drivability issues, it is important to address this code promptly to prevent potential long-term damage to the engine or emissions system.

How to diagnose DTC P2604 on BMW

To diagnose DTC P2604 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the intake air heater ‘A’ for any visible damage or signs of malfunction
3. Check the wiring and connectors in the intake air heater circuit for any issues
4. Perform a continuity test on the circuit to ensure proper electrical flow

How to fix DTC P2604 on BMW

To fix DTC P2604 on a BMW, you can try the following:

1. Replace the faulty intake air heater ‘A’
2. Repair or replace any damaged wiring or connectors in the circuit
3. If necessary, replace the Engine Control Module (ECM)

How to erase DTC P2604 on BMW

To erase DTC P2604 on a BMW, you can use a diagnostic scanner to clear the fault code from the ECM’s memory. After fixing the underlying issue, clearing the code will reset the Check Engine Light.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

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