Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

1999 Chrysler 300MFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

DTC MESSAGES & CODES

Scan Tool Code

Scan Tool Message

BAROMETRIC PRESSURE OUT OF RANGE

MAP SENSOR VOLTS TOO LOW

MAP SENSOR VOLTS TOO HIGH

INTAKE AIR TEMP SENSOR VOLTAGE LOW

INTAKE AIR TEMP SENSOR VOLTAGE HIGH

ECT SENSOR VOLTAGE TOO LOW

ECT SENSOR VOLTAGE TOO HIGH

TPS VOLTAGE DOES NOT AGREE WITH MAP

THROTTLE POSITION SENSOR VOLTAGE LOW

THROTTLE POSITION SENSOR VOLTAGE HIGH

CLOSED LOOP TEMP NOT REACHED

1/1 O2 SENSOR SHORTED TO GROUND

1/1 O2 SENSOR SHORTED TO VOLTAGE

1/1 O2 SENSOR SLOW RESPONSE

1/1 O2 SENSOR STAYS AT CENTER

1/1 O2 SENSOR HEATER FAILURE

1/2 O2 SENSOR SHORTED TO GROUND

1/2 O2 SENSOR SHORTED TO VOLTAGE

1/2 O2 SENSOR STAYS AT CENTER

1/2 O2 SENSOR HEATER FAILURE

2/1 O2 SENSOR SHORTED TO GROUND

2/1 O2 SENSOR SHORTED TO VOLTAGE

2/1 O2 SENSOR SLOW RESPONSE

2/1 O2 SENSOR STAYS AT CENTER

2/1 O2 SENSOR HEATER FAILURE

2/2 O2 SENSOR SHORTED TO GROUND

2/2 O2 SENSOR SHORTED TO VOLTAGE

2/2 O2 SENSOR STAYS AT CENTER

2/2 O2 SENSOR HEATER FAILURE

1/1 FUEL SYSTEM LEAN

1/1 FUEL SYSTEM RICH

2/1 FUEL SYSTEM LEAN

2/1 FUEL SYSTEM RICH

INJECTOR #1 CONTROL CIRCUIT

INJECTOR #2 CONTROL CIRCUIT

INJECTOR #3 CONTROL CIRCUIT

INJECTOR #4 CONTROL CIRCUIT

INJECTOR #5 CONTROL CIRCUIT

INJECTOR #6 CONTROL CIRCUIT

MULTIPLE CYLINDER MIS-FIRE

CYLINDER #1 MIS-FIRE

CYLINDER #2 MIS-FIRE

CYLINDER #3 MIS-FIRE

CYLINDER #4 MIS-FIRE

CYLINDER #5 MIS-FIRE

CYLINDER #6 MIS-FIRE

NO CRANK REFERENCE SIGNAL AT PCM

KNOCK SENSOR CIRCUIT

NO CAM SIGNAL AT PCM

IGNITION COIL #1 PRIMARY CIRCUIT

IGNITION COIL #2 PRIMARY CIRCUIT

IGNITION COIL #3 PRIMARY CIRCUIT

IGNITION COIL #4 PRIMARY CIRCUIT

IGNITION COIL #5 PRIMARY CIRCUIT

IGNITION COIL #6 PRIMARY CIRCUIT

EGR SYSTEM FAILURE

EGR SOLENOID CIRCUIT

EGR POSITION SENSOR RATIONALITY FAILURE

EGR POSITION SENSOR VOLTS TOO LOW

EGR POSITION SENSOR VOLTS TOO HIGH

CATALYTIC CONVERTER 1/1 EFFICIENCY FAILURE

CATALYTIC CONVERTER 2/1 EFFICIENCY FAILURE

EVAP PURGE FLOW MONITOR FAILURE

EVAP LEAK MONITOR SMALL LEAK DETECTED

EVAP PURGE SOLENOID CIRCUIT

EVAP LEAK MONITOR LARGE LEAK DETECTED

FUEL LEVEL UNIT NO CHANGE OVER MILES

FUEL LEVEL SENDING UNIT VOLTS TOO LOW

FUEL LEVEL SENDING UNIT VOLTS TOO HIGH

NO VEHICLE SPEED SENSOR SIGNAL

IDLE AIR CONTROL MOTOR CIRCUITS

POWER STEERING SWITCH FAILURE

P0600 ⁽¹⁾

PCM FAILURE SPI COMMUNICATIONS

P0601 ⁽¹⁾

INTERNAL CONTROLLER FAILURE

GENERATOR FIELD NOT SWITCHING PROPERLY

A/C CLUTCH RELAY CIRCUIT

P0700 ⁽²⁾

EATX CONTROLLER DTC PRESENT

BRAKE SWITCH SENSE CIRCUIT

1/1 O2S SLOW DURING CATALYST MONITOR

2/1 O2S SLOW DURING CATALYST MONITOR

P1281 ⁽³⁾

ENGINE IS COLD TOO LONG

FUEL PUMP RELAY CONTROL CIRCUIT

INTAKE MANIFOLD SHORT RUNNER SOLENOID CIRCUIT

MANIFOLD TUNE VALVE CONTROL CIRCUIT

TARGET IDLE NOT REACHED

NO CHANGE IN MAP FRONT START TO RUN

VACUUM LEAK FOUND (IAC FULLY SEATED)

AUTO SHUTDOWN RELAY CONTROL CIRCUIT

NO ASD RELAY OUTPUT VOLTAGE AT PCM

INTERMITTENT LOSS OF CMP OR CKP

MIS-FIRE ADAPTIVE NUMERATOR AT LIMIT

P1478 ⁽¹⁾

BATTERY TEMPS SENSOR VOLTS OUT OF LIMIT

EVAP LEAK MONITOR PINCHED HOSE FOUND

HIGH SPEED FAN CONTROL RELAY CIRCUIT

LOW SPEED FAN CONTROL RELAY CIRCUIT

AMBIENT/BATT TEMP SENSOR VOLTS TOO HIGH

AMBIENT/BATT TEMP SENSOR VOLTS TOO LOW

LEAK DETECT PUMP SWITCH OR MECHANICAL FAULT

LEAK DETECTION PUMP SOLENOID CIRCUIT

5 VOLT SUPPLY OUTPUT TOO LOW

CHARGING SYSTEM VOLTAGE TOO HIGH

SPEED CONTROL SOLENOID CIRCUITS

SPEED CONTROL SWITCH ALWAYS HIGH

SPEED CONTROL SWITCH ALWAYS LOW

A/C PRESSURE SENSOR VOLTS TOO HIGH

A/C PRESSURE SENSOR VOLTS TOO LOW

CHARGING SYSTEM VOLTAGE TOO LOW

SPEED CONTROL POWER RELAY, OR SPEED CONTROL 12V DRIVER CIRCUIT

P1685 ⁽⁴⁾

WRONG OR INVALID KEY MSG RECEIVED FROM SKIM

P1686 ⁽⁵⁾

NO SKIM BUS MESSAGE RECEIVED

P1687 ⁽⁵⁾

NO MIC BUS MESSAGE

NO CCD/PCI BUS MESSAGE FROM BODY CONTROL MODULE

PCM FAILURE EEPROM WRITE DENIED

PCM FAILURE SRI MILE NOT STORED

NO CCD/PCI BUS MESSAGE FROM TCM

P/N SWITCH STUCK IN PARK OR IN GEAR

⁽¹⁾	Replace Powertrain Control Module (PCM). Perform TEST VER-2A

.

⁽²⁾	See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS for diagnosis of electronic controlled transaxle.

⁽³⁾	Check cooling system and thermostat if engine coolant temperature does not reach 176°F (80°C) after driving 20 minutes.

⁽⁴⁾	Connect scan tool to Data Link Connector (DLC). Go to ENGINE, MISC. Place Smart Key Immobilizer (SKIM) in secured access mode by using appropriate PIN for this vehicle. Select update to Secret Key Data. Data will be transferred from SKIM to PCM.

⁽⁵⁾	Refer to appropriate BODY CONTROL COMPUTER TESTS article in ACCESSORIES & EQUIPMENT for testing.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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