OBDII Error Codes
Everything pertaining to OBDII diagnostics and error code reading and troubleshooting.
132 Cummins articles in this category
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P0584 HIGH VOLTAGE DETECTED AT THE SPEED CONTROL VACUUM DRIVER When Monitored and Set Condition: When Monitored: While the engine is running and the Speed control engaged. Set Condition: The Speed Control Vacuum commanded state is on and the feedback state is off. POSSIBLE CAUSES SPEED CONTROL SERVO ASSEMBLY (V36) SPEED CONTROL VACUUM C
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P0587 LOW VOLTAGE DETECTED AT THE SPEED CONTROL VENT DRIVER When Monitored and Set Condition: When Monitored: While driving and the Speed control is set. Set Condition: This code will set if the voltage detected on the Speed Control Vent circuit at the ECM is different than the expected voltage for 3 seconds. POSSIBLE CAUSES P0595 OR P0596 PRESENT
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P0588 HIGH VOLTAGE DETECTED AT THE SPEED CONTROL VENT DRIVER When Monitored and Set Condition: When Monitored: While the engine is running and the Speed control is set. Set Condition: The Speed control vent commanded state is on and the feedback state is off. POSSIBLE CAUSES SPEED CONTROL SERVO ASSEMBLY (V35) SPEED CONTROL VENT SHORTED
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P0595 LOW VOLTAGE DETECTED AT THE S/C BRAKE SWITCH OUTPUT When Monitored and Set Condition: When Monitored: While the key is on. Set Condition: The voltage detected on the Cruise Control Servo is above a calibrated value for a calibrated amount on time. POSSIBLE CAUSES SPEED CONTROL SERVO (V32) S/C 12-VOLT SOURCE CIRCUIT OPEN
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P0596 HIGH VOLTAGE DETECTED AT THE S/C BRAKE SWITCH OUTPUT When Monitored and Set Condition: When Monitored: While the key is on. Set Condition: The voltage detected on the Speed Control Servo is below a calibrated value for a calibrated amount on time. POSSIBLE CAUSES SPEED CONTROL SERVO ASSEMBLY (V32) S/C 12-VOLT SOURCE SHORTE
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P0602 CHECKSUM ERROR When Monitored and Set Condition: When Monitored: While the ignition is on. Set Condition: A deviation between the ECM memory and a stored calibration. POSSIBLE CAUSES FLASH ECM ECM DIAGNOSTIC PROCEDURE Using the DRBIII®, reflash the ECM with the proper calibrati
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P0602 CONTROL MODULE PROGRAMMING ERROR When Monitored and Set Condition: When Monitored: Continuously Set Condition: The DTC will always light the MIL, and is designed to signal the technician that the controller still has generic software installed. POSSIBLE CAUSES ENGINE AND TRANSMISSION NEED TO BE PROGRAMMED PCM
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P0604 ECM SOFTWARE ERROR When Monitored and Set Condition: When Monitored: While the key is on. Set Condition: Internal ECM software error. POSSIBLE CAUSES REFLASH ECM ECM DIAGNOSTIC PROCEDURE Using the DRBIII®, reflash the module with latest calibration Was the flash successful?
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P0604 INTERNAL TCM When Monitored and Set Condition: When Monitored: Continuously with the ignition on. Set Condition: Whenever the PCM detects an internal controller problem. POSSIBLE CAUSES POWER OR GROUND CIRCUIT POWERTRAIN CONTROL MODULE DIAGNOSTIC PROCEDURE Using the schematics as a guide, ins
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P0605 INTERNAL TCM When Monitored and Set Condition: When Monitored: Continuously with the ignition on. Set Condition: Whenever the PCM detects an internal controller problem. POSSIBLE CAUSES POWER OR GROUND CIRCUIT POWERTRAIN CONTROL MODULE DIAGNOSTIC PROCEDURE Using the schematics
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P0606 ECM HARDWARE ERROR When Monitored and Set Condition: When Monitored: With the key on or engine running. Set Condition: ECM had detected internal failures. POSSIBLE CAUSES ECM DIAGNOSTIC PROCEDURE Turn the ignition on. NOTE: This DTC is caused by an internal Engine Control Module failure. Repai
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P0607 ECM INTERNAL FAILURE When Monitored and Set Condition: When Monitored: With the key on or engine running Set Condition: ECM had detected internal failures. POSSIBLE CAUSES ECM DIAGNOSTIC PROCEDURE Turn the ignition on. NOTE: This DTC is caused by an internal Engine Control Module failure. Repa
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P0613 INTERNAL TCM When Monitored and Set Condition: When Monitored: Continuously with the ignition on. Set Condition: Whenever the PCM detects an internal controller problem, POSSIBLE CAUSES POWER OR GROUND CIRCUIT POWERTRAIN CONTROL MODULE DIAGNOSTIC PROCEDURE Using the schematics as a guide, inspect the wiring
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P0622 GENERATOR FIELD NOT SWITCHING PROPERLY When Monitored and Set Condition: When Monitored: When the ignition is on. Set Condition: The feedback signal does not match the commanded signal for the voltage regulator. POSSIBLE CAUSES GENERATOR OPEN DRIVER CIRCUIT GEN SOURCE SHORTED TO BATTERY NEGATIVE &#
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P0628 LOW VOLTAGE DETECTED AT THE FUEL LIFT PUMP When Monitored and Set Condition: When Monitored: While the key is on. Set Condition: The voltage detected on the Fuel Lift Pump is above a calibrated value for a calibrated amount on time. POSSIBLE CAUSES LOOSE CONNECTION GROUND CIRCUIT OPEN LIFT PUMP SHO
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P0629 HIGH VOLTAGE DETECTED AT THE FUEL LIFT PUMP When Monitored and Set Condition: When Monitored: While the key is on. Set Condition: The commanded signal to the lift pump does not match the feedback signal from the lift pump. POSSIBLE CAUSES LOOSE CONNECTION (K62) SUPPLY CIRCUIT SHORTED TO VOLTAGE (K62) SUPPL
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P0630 VIN NOT ENTERED ERROR When Monitored and Set Condition: When Monitored: While the key is on. Set Condition: The VIN was not calibrated into the ECM. POSSIBLE CAUSES VIN NOT CALIBRATED INTO ECM DIAGNOSTIC PROCEDURE Using the DRBIII®, recalibrate the ECM with the proper VIN. Did the DTC P0630 reset?
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P0633 SKIM SECRET KEY NOT ENTERED When Monitored and Set Condition: When Monitored: While the key is on. Set Condition: The SKIM secret key was not calibrated into the ECM. POSSIBLE CAUSES IMPROPER IGNITION KEY IS BEING USED SKIM DTC'S SKIM NOT CALIBRATED PROPERLY DIAGNOSTIC PROCEDURE
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P0642 LOW VOLTAGE AT THE #2 SENSOR SUPPLY CIRCUIT When Monitored and Set Condition: When Monitored: With the key on. Set Condition: Voltage detected on the #2 sensor supply circuit is below a calibrated value. POSSIBLE CAUSES FAN CLUTCH ASSEMBLY (F856) 5-VOLT SHORTED TO GROUND (F856) 5-VOLT SUPPLY SHORTED TO ANOTHE
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P0643 HIGH VOLTAGE AT THE #2 SENSOR SUPPLY CIRCUIT When Monitored and Set Condition: When Monitored: With the key on. Set Condition: Voltage detected on the #2 sensor supply circuit was above a calibrated value. POSSIBLE CAUSES FAN CLUTCH ASSEMBLY (F856) 5-VOLT SHORTED TO VOLTAGE INTERMITTENT CONDITION &
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P0646 LOW VOLTAGE DETECTED AT THE A/C CLUTCH RELAY When Monitored and Set Condition: When Monitored: When the ignition is on. Set Condition: When the signal from the A/C Clutch output does not match the signal from the A/C Clutch feedback. POSSIBLE CAUSES A/C CLUTCH RELAY LOOSE CONNECTION FUSED BATTERY S
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P0647 HIGH VOLTAGE DETECTED AT THE A/C CLUTCH RELAY When Monitored and Set Condition: When Monitored: When the ignition is on. Set Condition: When the signal from the A/C Clutch output does not match the signal from the A/C Clutch feedback. POSSIBLE CAUSES LOOSE CONNECTION FUSED BATTERY SUPPLY A/C CLUTCH
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P0652 LOW VOLTAGE AT THE #1 SENSOR SUPPLY CIRCUIT When Monitored and Set Condition: When Monitored: With the key on. Set Condition: Voltage detected on the sensor supply is below a calibrated value. POSSIBLE CAUSES ECM (F855) #1 5-VOLT SUPPLY SHORTED TO GROUND (F855) #1 5-VOLT SUPPLY SHORTED
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P0698 ACCELERATOR PEDAL POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO LOW When Monitored and Set Condition: When Monitored: With engine running. Set Condition: Low voltage detected at the APPS signal circuit. POSSIBLE CAUSES (K851) APPS 5-VOLT SUPPLY OPEN APPS HIGH RESISTANCE (K851) 5-VOLT SUPPLY CIRCUIT SHORTED TO
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P0699 ACCELERATOR PEDAL POSITION SENSOR (APPS) SUPPLY VOLTAGE TOO HIGH When Monitored and Set Condition: When Monitored: While engine is running. Set Condition: High voltage detected at the APPS supply circuit. POSSIBLE CAUSES (K851) 5-VOLT SUPPLY OPEN (K851) 5-VOLT SUPPLY SHORT TO VOLTAGE ECM &#
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