Possible causes – Faulty Fuel Pump– Fuel pump harness is open or shorted– Fuel pump circuit poor electrical connection– Faulty Fuel Pump Relay– Faulty fuel pump control module (if applicable) Symptoms – Engine Light ON (or Service Engine Soon Warning

Possible causes – Faulty Fuel Quantity Solenoid– Fuel Quantity Solenoid harness is open or shorted– Fuel Quantity Solenoid circuit poor electrical connection When is the code detected? The Engine Control Module (ECM) has detected a short to ground condition on

Possible causes – Faulty Fuel Quantity Solenoid– Fuel Quantity Solenoid harness is open or shorted– Fuel Quantity Solenoid circuit poor electrical connection When is the code detected? The Engine Control Module (ECM) has detected an excessive current condition on the

Possible causes – Faulty Fuel Quantity Solenoid– Fuel Quantity Solenoid harness is open or shorted– Fuel Quantity Solenoid circuit poor electrical connection When is the code detected? The Engine Control Module (ECM) has detected an open or excessive current on

Possible causes – Faulty Fuel Quantity Solenoid– Fuel Quantity Solenoid harness is open or shorted– Fuel Quantity Solenoid circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Fuel Tank Pressure Sensor– Fuel Tank Pressure Sensor harness is open or shorted– Fuel Tank Pressure Sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? A high voltage signal from

Possible causes – Faulty Glow Plug Control Module (GPCM)– GPCM harness is open or shorted– GPCM circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? The Engine Control Module (ECM) has detected a communication fault

Possible causes – Faulty Glow Plug Control Module (GPCM)– GPCM harness is open or shorted– GPCM circuit poor electrical connection– Faulty Engine Control Module (ECM) When is the code detected? The Engine Control Module (ECM) has detected a fault on

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection– Heated Oxygen

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection– Heated Oxygen

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground– Heated Oxygen Sensor (H2OS) Bank

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted– Heated Oxygen Sensor (H2OS) Bank 1

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 fuse– Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 harness is open or shorted– Heated Oxygen Sensor (H2OS) Bank 1

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground– Heated Oxygen Sensor (H2OS)

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection– Heated Oxygen Sensor (H2OS)

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection– Heated Oxygen Sensor (H2OS)

Possible causes – Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 harness is open shorted– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit poor electrical connection– Heated Oxygen Sensor (H2OS)

Possible causes – Faulty Idle Air Control (IAC) motor– Idle Air Control (IAC) motor harness is open or shorted– Idle Air Control (IAC) motor circuit poor electrical connection When is the code detected? The PCM senses a short to ground

Possible causes – Faulty Idle Air Control (IAC) motor– Idle Air Control (IAC) motor harness is open or shorted– Idle Air Control (IAC) motor circuit poor electrical connection When is the code detected? The PCM senses a short to ground

Possible causes – Faulty Idle Control System motor– Idle Control System motor harness is open or shorted– Idle Control System motor circuit poor electrical connection– Faulty Powertrain or Engine Control Module– Vaccum leaks or damaged hoses or improper routing Symptoms