WOMS
P code powertrain Medium severity

P2606 Intake Air Heater "B" Circuit Range/Performance

The OBD2 code P2606 indicates a problem with the intake air heater "B" circuit, specifically that its performance or range is outside the expected parameters, which may affect engine performance and emissions

Definition

The OBD2 code P2606 indicates a problem with the intake air heater "B" circuit, specifically that its performance or range is outside the expected parameters, which may affect engine performance and emissions

Common causes

  • Faulty intake air heater
  • Open or shorted wiring in the circuit
  • Poor electrical connections
  • Failed engine control module (ECM)
  • Faulty temperature sensor
  • Blown fuse
  • Corroded connectors
  • Malfunctioning relay

Common misdiagnoses

  • Faulty intake air heater
  • Wiring issues or shorts in the circuit
  • Bad connectors or corroded terminals
  • Faulty engine control module (ECM)
  • Incorrectly diagnosed fuel system issues
  • Misinterpretation of related sensor data
  • Vacuum leaks or intake manifold issues
  • Faulty temperature sensors
  • Issues with the exhaust gas recirculation (EGR) system
  • Problems with the throttle body or air intake system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect the Intake Air Heater

    Locate the intake air heater and visually inspect it for any signs of damage, corrosion, or disconnection

  3. 3. Check the heater element for continuity using a multimeter. If the element is open or shorted, it may need to be replaced

  4. 4. Examine the Wiring and Connectors

    Inspect the wiring harness and connectors associated with the intake air heater circuit for any signs of wear, fraying, or corrosion

  5. 5. Ensure that all connections are secure and free of dirt or moisture

  6. 6. Test the Power Supply

    Check for proper voltage at the intake air heater connector while the engine is running or during a cold start. The voltage should match the specifications in the vehicle's service manual

  7. 7. If there is no power, trace the circuit back to the fuse box and check for blown fuses or faulty relays

  8. 8. Check the Engine Control Module (ECM)

    Ensure that the ECM is functioning properly and is not sending incorrect signals to the intake air heater

  9. 9. If necessary, update or reprogram the ECM according to manufacturer specifications

  10. 10. Inspect the Temperature Sensor

    If the vehicle is equipped with a temperature sensor that monitors the intake air temperature, check its operation. A faulty sensor can lead to incorrect readings and trigger the P2606 code

  11. 11. Test the sensor for proper resistance and replace it if it is out of specification

  12. 12. Clear the Code and Test Drive

    After performing the necessary repairs, clear the trouble codes using the OBD-II scanner

  13. 13. Take the vehicle for a test drive to see if the code reappears. Monitor the performance of the intake air heater during cold starts

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P2606 code for your specific vehicle make and model. Manufacturers may have issued guidance or fixes for known issues

  15. 15. Seek Professional Help

    If the issue persists after performing the above steps, consider consulting a professional mechanic or technician who has experience with your vehicle's make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2606 code. Always refer to the vehicle's service manual for specific procedures and specifications