Limp-In Mode

Limp-in mode is the attempt by Engine Control Module/Powertrain Control Module (ECM/PCM) to compensate for failure of certain components by substituting information from other sources so that vehicle can still be operated. If ECM/PCM senses incorrect data or no data at all from MAP sensor, TP sensor, ECT sensor or battery voltage, system is placed into limp-in mode and Malfunction Indicator Light (MIL) on instrument panel comes on.

If faulty sensor comes back on-line, ECM/PCM will resume closed loop operation. To prevent damage to catalytic converter, vehicle should NOT be driven for extended periods in limp-in mode.