No scan tool, including the BlueDriver Bluetooth Professional OBDII Scan Tool for iPhone, can directly “Clear” Limp Home Mode (LHM). LHM is a protective measure activated by vehicle modules to prevent drivetrain damage under unusual operating conditions. This can manifest as reduced power (e.g., disabled turbo), limited RPM, or restricted transmission operation (e.g., Park/2nd gear only).
Addressing the underlying mechanical or electrical issue causing LHM is the solution. Once fixed, most engine-related LHM conditions will automatically reset, restoring normal operation without needing to clear Diagnostic Trouble Codes (DTCs). However, transmission-related LHM usually requires using a scan tool to clear DTCs within the Transmission Control Module (TCM). A generic OBDII tool like the BlueDriver, while excellent for reading and clearing many codes, might not provide access to the TCM. Sprinter vans, for example, often require a specialized “higher level” scan tool for TCM access. Simply clearing DTCs from the Engine Control Module (ECM) or Electronic Control Unit (ECU) might be insufficient for transmission-related LHM.
Clearing DTCs without properly documenting them first can hinder future troubleshooting. A DTC might indicate a failing component that only triggers a code once. Losing that historical record can complicate diagnosis later. Generic OBDII tools like the BlueDriver can potentially clear codes they cannot even display, further complicating matters.
If your vehicle is under warranty, avoid clearing ANY DTC history. Dealerships require this information for warranty repairs, including emissions-related extended warranties. Clearing DTCs is not a repair in itself; it only erases the recorded evidence of a problem. Not all power loss scenarios indicate LHM; other mechanical or electrical faults can be responsible.
Using a professional-grade Bluetooth OBDII scan tool like the BlueDriver offers valuable diagnostic capabilities, providing insight into DTCs and potential vehicle issues. However, it’s crucial to understand its limitations regarding LHM and the importance of comprehensive DTC documentation. For complex transmission-related LHM or vehicles requiring specialized access, consultation with a qualified technician using dealer-level scan tools is often necessary.
