WOMS
P code powertrain Medium severity

P1600 Loss of KAM Power; Open Circuit

The OBD2 code P1600 indicates a loss of Keep Alive Memory (KAM) power, typically due to an open circuit, which affects the vehicle's ability to retain important settings and data when the ignition is off

Definition

The OBD2 code P1600 indicates a loss of Keep Alive Memory (KAM) power, typically due to an open circuit, which affects the vehicle's ability to retain important settings and data when the ignition is off

Common causes

  • Faulty battery
  • Poor battery connections
  • Damaged wiring or connectors
  • Faulty powertrain control module (PCM)
  • Corroded terminals
  • Blown fuses
  • Malfunctioning ignition switch
  • Electrical shorts in the circuit

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Bad Battery or Battery Connections
  • Faulty Alternator
  • Wiring Issues or Shorts
  • Corroded Connectors
  • Faulty Ground Connections
  • Issues with the Ignition Switch
  • Faulty Fuses or Relay Problems

Troubleshooting steps

  1. 1. Check Battery Voltage

    Ensure the vehicle's battery is fully charged and in good condition. A weak or dead battery can cause KAM power loss

  2. 2. Inspect Fuses

    Check the fuses related to the ECM and KAM power. A blown fuse can interrupt power supply to the ECM

  3. 3. Examine Wiring and Connectors

    Inspect the wiring harness and connectors leading to the ECM for any signs of damage, corrosion, or loose connections. Pay special attention to the power and ground wires

  4. 4. Test Power and Ground at the ECM

    Use a multimeter to check for proper voltage at the ECM power and ground terminals. The ECM typically requires a constant power supply (usually 12V) and a good ground connection

  5. 5. Check for Short Circuits

    Look for any short circuits in the wiring that could be causing a loss of power. This may involve visually inspecting the wiring and using a multimeter to test continuity

  6. 6. Inspect the Ignition Switch

    Ensure that the ignition switch is functioning properly. A faulty ignition switch can lead to intermittent power loss to the ECM

  7. 7. Scan for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Other codes can provide additional context for the issue

  8. 8. Reset the ECM

    After addressing any issues found, clear the trouble codes using an OBD-II scanner and see if the P1600 code returns. Sometimes, a reset can resolve temporary glitches

  9. 9. Check for Software Updates

    In some cases, the ECM may require a software update from the manufacturer. Check with a dealership or qualified technician for any available updates

  10. 10. Consult a Professional

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the underlying issue causing the P1600 code