P0703 FORD Brake Switch Performance

Possible causes – Faulty Brake Switch– Misadjusted Brake Switch– Brake Switch harness is open or shorted– Brake Switch circuit poor electrical connection Tech description Check if the stop light works with the brake pedal, if the brake lights are inoperative, replaced or adjust the brake switch. Symptoms – Engine Light ON (or Service Engine Soon…

P1309 FORD Misfire Detection Monitor Not enabled

Possible causes – Faulty Camshaft Position Sensor – Synchronize Assembly not properly installed.– Verify the cam sensor is synchronized– Faulty Powertrain Control Module (PCM)– Verify input sensor parameters are correct Tech description Replacing the Camshaft Position Sensor (CMP) usually takes care of the problem, but if the sensor is installed out of synchronization it will…

P0538 FORD A/C Evaporator Temperature Circuit High Input

Possible causes – Faulty A/C Evaporator Temperature Sensor– A/C Evaporator Temperature Sensor harness is open or shorted– A/C Evaporator Temperature Sensor circuit poor electrical connection When is the obd code mean? When the A/C Evaporator Temperature (ACET) sensor signal is high the Powertrain Control Module (PCM) will triggered the P0538 code. Symptoms – Engine Light…

P0539 FORD A/C Evaporator Temperature Circuit Intermittent

Possible causes – Faulty A/C Evaporator Temperature Sensor– A/C Evaporator Temperature Sensor harness is open or shorted– A/C Evaporator Temperature Sensor circuit poor electrical connection When is the obd code mean? When the A/C Evaporator Temperature (ACET) sensor signal is intermittent the Powertrain Control Module (PCM) will triggered the P0539 code. Symptoms – Engine Light…

P0406 FORD Exhaust Gas Recirculation Sensor A Circuit High

Possible causes – EGR Valve clogged, dirty or leaky– EGR valve damaged/defective– EGR volume control solenoid valve– EGR temperature sensor and circuit– EGR volume control solenoid valve harness is open or shorted– EGR volume control solenoid valve circuit poor electrical connection When is the obd code mean? An improper voltage signal is sent to ECM…

P0404 FORD Exhaust Gas Recirculation Circuit Range/Performance

Possible causes – EGR volume control solenoid valve– EGR volume control solenoid valve harness is open or shorted– EGR volume control solenoid valve circuit poor electrical connection– EGR temperature sensor and circuit Tech description There is a factory service bulletin for the following Ford models: 2003-2007 Ford F-Super Duty2004-2007 Ford E-350, E-4502003-2005 Ford ExcursionFord Factory…

P0405 FORD Exhaust Gas Recirculation Sensor A Circuit Low

Possible causes – EGR volume control solenoid valve– EGR volume control solenoid valve harness is open or shorted– EGR volume control solenoid valve circuit poor electrical connection– EGR temperature sensor and circuit When is the obd code mean? An improper voltage signal is sent to ECM through the valve Symptoms – Engine Light ON (or…

P0402 FORD Exhaust Gas Recirculation Flow Excessive Detected

Possible causes – EGR volume control valve stuck open– Faulty EGR volume control valve– EGR solenoid valve harness is open or shorted– EGR solenoid valve circuit poor electrical connection– Faulty EGR temperature sensor and circuit Tech description There is a factory service bulletin for the following Ford models: 2000-2002 Ford Taurus2001-2002 Ford Crown Victoria2001-2002 Ford…

P0606 FORD ECM Internal Communication Error

Possible causes – Engine Control Module (ECM) Harness power supply circuit is open or shorted– Engine Control Module (ECM) Programming– Faulty Engine Control Module (ECM) Tech description Check the ECM fuse, if fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replaced the ECM….

P0605 FORD ECM Read Only Memory Error

Possible causes – Engine Control Module (ECM) may be faulty– ECM harness power supply circuit is open or shorted– ECM harness ground circuit is open or shorted Tech description Try erasing the code first, if the light comes back ON you may have to replaced the ECM to repair the problem. Symptoms – Engine Light…