OBD2 (OBDII) Scan Test is Incomplete
The computer system or ECM, PCM (engine control module, powertrain control module) that controls your car is equipped with a basic operating program. This operating program is designed to control your engine, transmission, emissions, safety systems and more. If a scan has been performed by using a code scanner and a " scan could not be completed" code is retrieved further troubleshooting is necessary. Usually a trouble code P1000 or manufacturers equivalent. We have listed several reasons for this condition.
Stuck Engine Thermostat - If the engine thermostat has stuck open it forces the engine coolant to stay at too low causing the ECM/PCM to stay in open loop. This open loop creates a state of preprogrammed parameters were no diagnostic tests can be preformed. (The ECM/PCM is constantly waiting for the engine to heat up to operating temperature)
Shorted Oxygen Sensor/Coolant Sensor - The ECM/PCM relies on main sensors to operated, if one of these sensors is severely shorted it can cause the ECM/PCM to stay in open loop causing a code gathering incomplete trouble code.
Shorted Fuel Injector - If a fuel injector short circuits it can cause the engine not to run by shorting the injector driver. If the car doesn't run and a diagnostic trouble codes can be set for causing an code gathering incomplete trouble code like P1000