Understanding the diagnostic trouble codes (DTCs) in your 2004 Jeep Grand Cherokee can save you time and money by helping you pinpoint potential issues before they escalate. This guide, created by an experienced auto repair expert at autelfrance.com, provides a detailed look into OBDII codes specific to your vehicle, offering insights into how to retrieve and interpret these codes effectively. Please note, while this guide aims to be comprehensive, it should be used as a troubleshooting aid and not a definitive repair manual. Always consult a certified mechanic for accurate diagnosis and repairs.
Understanding OBDII Codes on Your 2004 Jeep Grand Cherokee
OBDII, or On-Board Diagnostics II, is a standardized system in vehicles that monitors various components and systems within your car. When the system detects a problem, it generates a DTC, commonly known as an OBDII code, and often illuminates the “Check Engine Light” on your dashboard. These codes are designed to help mechanics and car owners diagnose issues efficiently. For a 2004 Jeep Grand Cherokee, understanding these codes is the first step towards maintaining your vehicle’s health.
What are OBDII Codes?
OBDII codes are alphanumeric codes that provide information about a detected malfunction in your vehicle. They are standardized across most vehicles manufactured after 1996, including your 2004 Jeep Grand Cherokee. These codes generally start with a letter followed by four numbers. The letter indicates the system affected (e.g., P for Powertrain, B for Body, C for Chassis, U for Network), and the numbers provide more specific details about the problem.
Why Check Your OBDII Codes?
Checking your OBDII codes offers numerous benefits:
- Early Problem Detection: Identify minor issues before they become major, expensive repairs.
- Informed Decisions: Understand the potential problem before taking your Jeep to a mechanic, enabling you to discuss repairs more knowledgeably.
- DIY Diagnostics: For car enthusiasts and DIYers, OBDII codes provide a starting point for troubleshooting and potentially fixing issues yourself.
- Cost Savings: Diagnosing the problem yourself can prevent unnecessary trips to the mechanic for preliminary checks.
Retrieving OBDII Codes on Your 2004 Jeep Grand Cherokee
There are two primary methods to retrieve OBDII codes on your 2004 Jeep Grand Cherokee: the key cycle method and using an OBDII scanner.
Using the Key Cycle Method
For older OBDII models, like the 2004 Jeep Grand Cherokee, a “key trick” can often display the codes directly on your odometer. Here’s how to attempt this method:
- Start with the ignition off.
- Within five seconds, cycle the key from OFF to ON three times, ending in the ON position. (ON is NOT “Start” and OFF is NOT “Lock”).
- Observe the odometer. If successful, the odometer will first display “P” followed by four digits – this is your OBDII code. It may cycle through multiple codes if more than one issue is detected. “P0000” or “done” typically indicates no codes are present.
Important Notes for Key Cycle Method:
- Ensure you are turning the key to the “ON” position (where dashboard lights illuminate) but not starting the engine.
- The codes are usually displayed on the digital odometer.
- If this method doesn’t work, an OBDII scanner is the next reliable option.
Using an OBDII Scanner
The most reliable and modern way to retrieve OBDII codes is by using a dedicated OBDII scanner. These scanners are readily available online and at auto parts stores at various price points.
Steps to use an OBDII Scanner:
- Locate the OBDII port: In a 2004 Jeep Grand Cherokee, it is typically located under the dashboard on the driver’s side.
- Plug in the scanner: Connect the OBDII scanner to the port.
- Turn the ignition ON: Turn the key to the “ON” position without starting the engine.
- Follow scanner instructions: Power on the scanner and follow the manufacturer’s instructions to read codes. Scanners will usually display the codes and often provide a brief description of the fault.
- Record the codes: Write down all retrieved codes for further investigation and troubleshooting.
Benefits of using an OBDII Scanner:
- Reliability: Scanners provide a more consistent and accurate method of retrieving codes compared to the key cycle.
- Detailed Information: Many scanners offer code definitions, possible causes, and even live data readings from vehicle sensors.
- Code Clearing: Scanners can often clear codes after repairs are made, turning off the “Check Engine Light.”
2004 Jeep Grand Cherokee OBDII Code List and Meanings
Below is an extensive list of OBDII codes that may be relevant to your 2004 Jeep Grand Cherokee. This list is compiled from various sources and is intended as a guide. Always verify code definitions with a reliable source or professional mechanic.
Generic OBDII Codes (P0xxx, P2xxx):
- P0030: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
- P0036: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
- P0106: MAP Sensor Voltage Out of Range Detected at Startup
- P0107: MAP Sensor Voltage Too Low
- P0108: MAP Sensor Voltage Too High
- P0112: Intake Air Temperature Sensor Voltage Low
- P0113: Intake Air (Charge) Temperature Sensor Voltage High
- P0116: Coolant Temperature Sensor Reading Doesn’t Make Sense
- P0117: Engine Coolant Temperature Sensor Voltage Low
- P0118: Engine Coolant Temperature Sensor Voltage High
- P0121: Throttle Position Sensor and MAP Sensor Disagree with Each Other
- P0122: Throttle Position Sensor Voltage Low
- P0123: Throttle Position Sensor Voltage High
- P0125: Taking Too Long to Reach Proper Operating Temperature
- P0130: O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
- P0131: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
- P0132: O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
- P0133: O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
- P0134: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
- P0135: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
- P0136: O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
- P0137: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
- P0138: O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
- P0139: O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
- P0140: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
- P0141: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
- P0142: O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
- P0143: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
- P0144: O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
- P0145: O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
- P0146: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
- P0147: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
- P0151: Oxygen sensor voltage problem – short circuit to ground?
- P0152: Oxygen sensor voltage problem – short circuit to active 12V?
- P0153: Oxygen sensor response too slow
- P0154: Oxygen sensor does not show either a rich or lean condition
- P0155: Oxygen sensor heater element not working properly
- P0157: Oxygen sensor voltage problem – short circuit to ground?
- P0158: Oxygen sensor voltage problem – short circuit to active 12V?
- P0159: Oxygen sensor response too slow
- P0160: Oxygen sensor does not show either a rich or lean condition
- P0161: Oxygen sensor heater element not working properly
- P0171: System Too Lean (Bank 1)
- P0172: System Too Rich (Bank 1)
- P0174: System Too Lean (Bank 2)
- P0175: System Too Rich (Bank 2)
- P0176: Flex Fuel Sensor Circuit Malfunction
- P0178: Flex Fuel Sensor Circuit Low Input
- P0179: Flex Fuel Sensor Circuit High Input
- P0182: CNG Temperature Sensor Circuit Low Input
- P0183: CNG Temperature Sensor Circuit High Input
- P0201: Injector #1 Control Circuit Malfunction
- P0202: Injector #2 Control Circuit Malfunction
- P0203: Injector #3 Control Circuit Malfunction
- P0204: Injector #4 Control Circuit Malfunction
- P0205: Injector #5 Control Circuit Malfunction
- P0206: Injector #6 Control Circuit Malfunction
- P0207: Injector #7 Control Circuit Malfunction
- P0208: Injector #8 Control Circuit Malfunction
- P0300: Random/Multiple Cylinder Misfire Detected
- P0301: Cylinder 1 Misfire Detected
- P0302: Cylinder 2 Misfire Detected
- P0303: Cylinder 3 Misfire Detected
- P0304: Cylinder 4 Misfire Detected
- P0305: Cylinder 5 Misfire Detected
- P0306: Cylinder 6 Misfire Detected
- P0307: Cylinder 7 Misfire Detected
- P0308: Cylinder 8 Misfire Detected
- P0320: Crankshaft Position Sensor Reference Signal Intermittent
- P0325: Knock Sensor 1 Circuit Malfunction
- P0330: Knock Sensor 2 Circuit Malfunction
- P0340: Camshaft Position Sensor Circuit Malfunction
- P0350: Ignition Coil Primary/Secondary Circuit Malfunction
- P0351: Ignition Coil A Primary/Secondary Circuit Malfunction
- P0352: Ignition Coil B Primary/Secondary Circuit Malfunction
- P0353: Ignition Coil C Primary/Secondary Circuit Malfunction
- P0354: Ignition Coil D Primary/Secondary Circuit Malfunction
- P0355: Ignition Coil E Primary/Secondary Circuit Malfunction
- P0356: Ignition Coil F Primary/Secondary Circuit Malfunction
- P0357: Ignition Coil G Primary/Secondary Circuit Malfunction
- P0358: Ignition Coil H Primary/Secondary Circuit Malfunction
- P0401: Insufficient EGR Flow Detected
- P0403: EGR Solenoid Control Circuit Malfunction
- P0404: EGR Sensor Circuit Range/Performance
- P0405: EGR Sensor Circuit Low Input
- P0406: EGR Sensor Circuit High Input
- P0412: Secondary Air Injection System Switching Valve Control Circuit Malfunction
- P0420: Catalyst System Efficiency Below Threshold (Bank 1)
- P0432: Catalyst System Efficiency Below Threshold (Bank 2)
- P0441: Evaporative Emission Control System Incorrect Purge Flow
- P0442: Evaporative Emission Control System Leak Detected (Small Leak)
- P0443: Evaporative Emission Control System Purge Control Valve Circuit Malfunction
- P0455: Evaporative Emission Control System Leak Detected (Large Leak)
- P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
- P0460: Fuel Level Sensor Circuit Malfunction
- P0461: Fuel Level Sensor Circuit Range/Performance
- P0462: Fuel Level Sensor Circuit Low Input
- P0463: Fuel Level Sensor Circuit High Input
- P0500: Vehicle Speed Sensor Circuit Malfunction
- P0505: Idle Air Control System Malfunction
- P0522: Engine Oil Pressure Sensor/Switch Low Voltage
- P0523: Engine Oil Pressure Sensor/Switch High Voltage
- P0551: Power Steering Pressure Sensor/Switch Circuit Malfunction
- P0600: Serial Communication Link Malfunction
- P0601: Internal Control Module Memory Check Sum Error
- P0604: Internal Control Module Random Access Memory (RAM) Error
- P0605: Internal Control Module Read Only Memory (ROM) Error
- P0615: Starter Relay Circuit Malfunction
- P0622: Generator Field Control Circuit Malfunction
- P0645: A/C Clutch Relay Control Circuit Malfunction
- P0700: Transmission Control System Malfunction
- P0703: Brake Switch Input Circuit Malfunction
- P0711: Transmission Fluid Temperature Sensor Circuit Range/Performance
- P0712: Transmission Fluid Temperature Sensor Circuit Low Input
- P0713: Transmission Fluid Temperature Sensor Circuit High Input
- P0720: Output Shaft Speed Sensor Circuit Malfunction
- P0740: Torque Converter Clutch Circuit Malfunction
- P0743: Torque Converter Clutch Solenoid Circuit Electrical
- P0748: Pressure Control Solenoid ‘A’ Electrical
- P0751: Shift Solenoid ‘A’ Performance or Stuck Off
- P0753: Shift Solenoid ‘A’ Electrical
- P0756: Shift Solenoid ‘B’ Performance or Stuck Off
- P0783: 3-4 Shift Solenoid Malfunction
- P0801: Reverse Inhibit Control Circuit Malfunction
- P0833: Clutch Pedal Switch Circuit Malfunction
- P1192: Intake Air Temperature Sensor Circuit Low Input
- P1193: Intake Air Temperature Sensor Circuit High Input
- P1194: Heated Oxygen Sensor Heater Circuit Malfunction
- P1195: Heated Oxygen Sensor Slow Response
- P1196: Heated Oxygen Sensor Slow Response (Bank 2 Sensor 1)
- P1197: Heated Oxygen Sensor Slow Response (Bank 1 Sensor 1)
- P1198: Radiator Coolant Temperature Sensor Circuit Low Input
- P1199: Radiator Coolant Temperature Sensor Circuit High Input
- P1281: Engine is Cold Too Long
- P1282: Fuel Pump Relay Control Circuit Malfunction
- P1288: Manifold Tuning Valve Control Circuit Malfunction
- P1289: Manifold Tuning Valve Solenoid Control Circuit Malfunction
- P1290: CNG System Pressure Too High
- P1291: Heated Air Intake System Malfunction
- P1292: Natural Gas Pressure Sensor Circuit Malfunction
- P1293: Natural Gas Pressure Sensor Circuit Malfunction
- P1294: Target Idle Speed Not Reached
- P1295: Throttle Position Sensor Signal Too Low
- P1296: MAP Sensor Signal Too Low
- P1297: MAP Sensor Signal Not Changing with Engine Running
- P1298: Lean Run During Wide Open Throttle
- P1299: MAP Sensor and Throttle Position Sensor Incompatible
- P1388: Auto Shutdown Relay Control Circuit Malfunction
- P1389: Auto Shutdown Relay Sense Circuit Low
- P1390: Cam/Crank Sensor Signals Out of Phase
- P1391: Intermittent Loss of Crankshaft Position Sensor Signal
- P1398: Crankshaft Position Sensor (CKP) Variation Learn Not Performed
- P1399: Wait to Start Lamp Circuit Malfunction
- P1403: EGR Valve Position Sensor Circuit Low Voltage
- P1476: Secondary Air Injection System Insufficient Air Flow
- P1477: Secondary Air Injection System Excessive Air Flow
- P1478: Battery Temperature Sensor Circuit Malfunction
- P1479: Transmission Fan Relay Circuit Malfunction
- P1480: PCV Solenoid Circuit Malfunction
- P1481: Misfire Detection RPM Pulse Generator Signal Fault
- P1482: Catalyst Temperature Sensor Circuit Short to Ground
- P1483: Catalyst Temperature Sensor Circuit Short to Battery
- P1484: Catalytic Converter Overheating
- P1485: Air Injection Solenoid Circuit Malfunction
- P1486: Evaporative Emission Control System Leak (EVAP) Canister or Hose Blocked
- P1487: High Speed Cooling Fan Relay Control Circuit Malfunction
- P1488: 5 Volt Output Too Low
- P1489: High Speed Fan Control Relay Circuit Malfunction
- P1490: Low Speed Fan Control Relay Circuit Malfunction
- P1491: Radiator Fan Control Relay Circuit Malfunction
- P1492: Ambient/Battery Temperature Sensor Voltage Too High
- P1493: Ambient/Battery Temperature Sensor Voltage Too Low
- P1494: Leak Detection Pump Switch or Mechanical Fault
- P1495: Leak Detection Pump Solenoid Circuit Malfunction
- P1496: 5 Volt Supply Output Below Limit
- P1498: High Speed Fan Control Relay Circuit Malfunction
- P1594: Charging System Voltage Too High
- P1595: Speed Control Vacuum Solenoid Circuit Malfunction
- P1596: Speed Control Switch Always High
- P1597: Speed Control Switch Always Low
- P1598: A/C Pressure Sensor Voltage High
- P1599: A/C Pressure Sensor Voltage Low
- P1681: No Communication with Instrument Cluster Control (ICC) Module
- P1682: Charging System Voltage Low
- P1683: Speed Control Servo Power Circuit Malfunction
- P1684: Battery Disconnected Within Last 50 Starts
- P1685: Invalid Key – Immobilizer System
- P1686: No Communication with SKIM Module
- P1687: No Comm with Mechanical Instrument Cluster Module
- P1693: DTC Detected in Companion PCM
- P1694: No CCD Messages Received from PCM – Aisin Transmission
- P1695: No CCD Message From Body Control Module
- P1696: EEPROM Write Denied/Failure
- P1697: Unsuccessful attempt to update SRI mileage
- P1698: No CCD Message From TCM/PCM
- P1719: 2-3 Upshift Solenoid Valve Circuit
- P1740: Torque Converter Clutch System Fault
- P1756: Governor Pressure Not Equal To Target Pressure (Mid Range)
- P1757: Governor Pressure Not Equal To Target Pressure (Zero Range)
- P1762: Governor Pressure Sensor Offset Improper
- P1763: Governor Pressure Sensor Voltage Too High
- P1764: Governor Pressure Sensor Voltage Too Low
- P1765: Trans Relay Always On Or Off
- P1899: Park/Neutral Position Switch Stuck in Park or Neutral
Note: This is not an exhaustive list, and specific codes can sometimes have variations or require further diagnostics based on the context of your vehicle’s symptoms.
Disclaimer
This OBDII code guide for the 2004 Jeep Grand Cherokee is intended for informational purposes only and should not be considered a substitute for professional automotive diagnosis and repair. While every effort has been made to ensure accuracy, autelfrance.com and its contributors are not responsible for any errors or omissions, or for the results obtained from the use of this information.
- Accuracy Not Guaranteed: This list is compiled from multiple sources and may not be completely exhaustive or error-free.
- Troubleshooting Aid: Use this guide as an initial step in troubleshooting, not as a definitive repair manual.
- Consult a Professional: Always consult a qualified mechanic for proper diagnosis, repair procedures, and to address any safety concerns.
- Vehicle-Specific Issues: OBDII codes can sometimes be triggered by various underlying issues. A professional diagnosis is crucial to pinpoint the exact cause and ensure correct repairs.
Conclusion
Understanding and utilizing OBDII codes for your 2004 Jeep Grand Cherokee empowers you to take a proactive approach to vehicle maintenance. By using this guide to retrieve and interpret potential trouble codes, you can better understand your vehicle’s needs and communicate effectively with automotive professionals. Remember, while this guide is a valuable resource, professional expertise is always recommended for accurate diagnosis and repair of your vehicle. For further assistance or professional diagnostic tools, explore autelfrance.com for solutions tailored to your automotive needs.
