U3005 – Retained Accessory Power

The ODBII code U3005 indicates a malfunction in the Retained Accessory Power (RAP) system, which controls power to certain electrical accessories after the ignition is turned off.

The severity of ODBII code U3005 is moderate.

Common Causes For: U3003 Battery Voltage U3004 Accessory Power Relay

• Faulty body control module (BCM)
• Wiring issues or short circuits
• Poor ground connections
• Malfunctioning ignition switch
• Defective relay
• Battery voltage issues
• Corroded connectors
• Software glitches in the BCM

Common misdiagnosis for U3005 Retained Accessory Power

• Battery issues
• Faulty ignition switch
• Wiring harness problems
• Body control module (BCM) failure
• Faulty relay
• Short circuits in the electrical system
• Malfunctioning power window switches
• Defective door lock actuators

Common Troubleshooting Steps

The OBD-II code U3005 refers to a “Retained Accessory Power” issue, which typically indicates a problem with the vehicle’s electrical system related to the retained accessory power feature. This feature allows certain electrical components (like the radio or power windows) to remain operational for a short time after the ignition is turned off. Here are some common troubleshooting steps to diagnose and resolve the U3005 code:

• Check the Battery and Connections: **Inspect the Battery:** Ensure the battery is fully charged and in good condition. A weak or failing battery can cause various electrical issues.
• **Examine Battery Connections:** Check for corrosion, loose connections, or damaged cables at the battery terminals.
• Inspect Fuses and Relays: **Check Fuses:** Look for any blown fuses related to the accessory power circuit. Replace any that are blown.
• **Test Relays:** Inspect and test the relays associated with the retained accessory power system. Replace any faulty relays.
• Examine Wiring and Connectors: **Visual Inspection:** Look for damaged, frayed, or corroded wiring and connectors in the accessory power circuit.
• **Check Ground Connections:** Ensure that all ground connections are secure and free of corrosion.
• Scan for Additional Codes: **Use a Diagnostic Scanner:** Check for any other OBD-II codes that may be present. Other codes can provide additional context for the issue.
• **Clear Codes:** After addressing any issues, clear the codes and see if U3005 returns.
• Test the Accessory Power Module: **Locate the Module:** If applicable, find the retained accessory power module in your vehicle.
• **Test the Module:** Use a multimeter to check for proper voltage and ground at the module. If the module is faulty, it may need to be replaced.
• Check for Short Circuits: **Inspect for Shorts:** Look for any short circuits in the wiring that could be causing the issue. This may require a more in-depth inspection of the wiring harness.
• Review Vehicle-Specific Information: **Consult Repair Manuals:** Refer to the vehicle’s service manual for specific troubleshooting steps related to the retained accessory power system.
• **Check Technical Service Bulletins (TSBs):** Look for any TSBs related to the U3005 code for your specific make and model.
• Perform a System Reset: **Disconnect the Battery:** Disconnect the negative battery terminal for a few minutes to reset the vehicle’s computer. Reconnect and see if the code reappears.
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or an automotive electrician for further diagnosis and repair. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U3005 code. Always ensure safety precautions are taken when working with the vehicle’s electrical system.