OBDII Error Codes

P2502 CHARGING SYSTEM ERROR When Monitored and Set Condition: When Monitored: While the engine is running. Set Condition: The ECM cycles the voltage regulator in the generator while monitoring for a change in output voltage. If the voltage does not drop when the regulator is off, the fault is set. POSSIBLE CAUSES DIRTY OR LOOSE CONNECTIONS

P2503 CHARGING SYSTEM OUTPUT LOW When Monitored and Set Condition: When Monitored: While the engine is running. Set Condition: The battery voltage exceeds target voltage by more than a calibrated value. POSSIBLE CAUSES OTHER DTC'S PRESENT GENERATOR FIELD DRIVER CIRCUIT SHORTED TO GROUND

P2504 CHARGING SYSTEM OUTPUT HIGH When Monitored and Set Condition: When Monitored: While the engine is running. Set Condition: Battery voltage is less than 11.5 volts for more than 8 seconds. Battery voltage must exceed 12 volts for more than 5 seconds for fault to become inactive. POSSIBLE CAUSES OTHER DTC'S PRESENT DIRTY OR LOOSE CON

P2509 POWERDOWN DATA LOST ERROR When Monitored and Set Condition: When Monitored: Continuous - key on or key off. Set Condition: Loss of voltage detected at the ECM for a calibrated amount of time. POSSIBLE CAUSES POOR CONNECTIONS AT THE BATTERIES LOW BATTERY VOLTAGE OPEN FUSED B+ TO ECM

P2607 LOW VOLTAGE AT THE #2 INTAKE AIR HEATER RELAY When Monitored: When the ignition is on. Set Condition: When the signal from the #1 intake air heater output does not match the signal from the #1 intake air heater feedback. POSSIBLE CAUSES LOOSE CONNECTION INTAKE AIR HEATER RELAY SIGNAL CIRCUIT OPEN FROM RELAY TO ECM

P2608 HIGH VOLTAGE AT THE #2 INTAKE AIR HEATER RELAY When Monitored: When the ignition is on. Set Condition: When the signal from the #2 Intake Air Heater output does not match the signal from the #2 Intake Air Heater feedback. POSSIBLE CAUSES LOOSE CONNECTION INTAKE AIR HEATER RELAY SIGNAL CIRCUIT SHORTED TO BATTERY NEGATIVE ECM

P2609 NO VOLTAGE DROP SEEN FROM INTAKE AIR HEATERS When Monitored and Set Condition: When Monitored: First 15 seconds of engine operation. Set Condition: The ECM does not detect a voltage drop on the intake air heater circuit. POSSIBLE CAUSES INTAKE AIR HEATER OPEN INTAKE AIR HEATER GROUND OPEN OPEN BATTERY CABL