Experiencing a check engine light in your 2001 Chrysler PT Cruiser can be concerning. Fortunately, modern vehicles like the PT Cruiser are equipped with an On-Board Diagnostics system (OBD2) that helps pinpoint potential problems. This system generates diagnostic trouble codes, commonly known as OBD2 codes, which can be accessed and interpreted to understand what’s going wrong with your car. This guide will walk you through understanding and retrieving these codes specifically for your 2001 Chrysler PT Cruiser.
Understanding OBD2 Codes on Your 2001 PT Cruiser
The 2001 Chrysler PT Cruiser, like all vehicles sold in the US during that era, is OBD2 compliant. This standardization means you can use any generic OBD2 scanner to read trouble codes. These codes are designed to alert you to issues that could affect your vehicle’s emissions or overall performance. When the system detects a problem, it often illuminates the “check engine light” on your dashboard.
However, not all issues trigger the light immediately. Some less critical problems are stored as codes in the computer’s memory and can be retrieved even if the light isn’t on. It’s important to address these codes promptly to prevent more significant damage or costly repairs down the road.
One of the benefits of the OBD2 system is a “limp-in” mode. In case of a critical sensor failure, the PT Cruiser’s computer can switch to a pre-programmed set of parameters. This allows you to drive the vehicle to a safe location or repair shop, although performance might be significantly reduced – in some cases, the automatic transmission may be limited to second gear.
Interestingly, the check engine light is designed to briefly illuminate for about two seconds every time you start your PT Cruiser. This is a self-check to confirm the bulb is working. If the light doesn’t come on at all during startup, it could indicate a problem with the light itself, masking potential engine issues.
The check engine light might automatically turn off if the problem resolves itself. This can happen if the issue isn’t detected for three consecutive drive cycles or if specific emission or fuel system tests pass repeatedly. However, the underlying OBD2 code will likely remain stored until cleared.
Methods to Retrieve OBD2 Codes on Your 2001 Chrysler PT Cruiser
There are a couple of methods to access the OBD2 codes on your 2001 Chrysler PT Cruiser:
1. The Key Cycling Method (Without a Scanner)
This method uses the vehicle’s odometer to display the codes. It might take a few tries to get it right, but it doesn’t require any special tools.
Here’s how to do it:
- Make sure your PT Cruiser is turned off.
- Insert the key into the ignition.
- Turn the key to the “RUN” position (just before “START”), then back to “OFF.”
- Repeat this “RUN” to “OFF” to “RUN” sequence three times within five seconds. Important: Don’t start the engine.
- On the third “RUN” position, leave the key in “RUN” and observe the odometer display.
The odometer will display any stored OBD2 codes, which will start with the letter “P” (for Powertrain). If there are no codes, the odometer will display “done.”
Important Notes for Key Cycling:
- Timing is crucial. Don’t cycle the key too quickly. Wait for the odometer to light up each time you turn the key to “RUN.”
- This method may not retrieve all codes, especially manufacturer-specific codes related to systems like the transmission.
2. Using an OBD2 Scanner
The most reliable and comprehensive way to retrieve OBD2 codes is by using a dedicated OBD2 scanner. These scanners are readily available online and at auto parts stores at various price points.
Steps to use an OBD2 Scanner:
- Locate the OBD2 port in your 2001 Chrysler PT Cruiser. It’s typically located under the dashboard on the driver’s side.
- Plug the OBD2 scanner into the port.
- Turn the ignition key to the “RUN” position (don’t start the engine).
- Follow the scanner’s instructions to connect to the vehicle’s computer and read trouble codes. The process varies slightly depending on the scanner model, but generally involves selecting “Read Codes” or “Diagnostic Codes” from the menu.
OBD2 scanners usually display the code number (e.g., P0300) and often provide a brief description of the code. Some advanced scanners can offer more detailed information, including possible causes and even live engine data.
Alt text: Plugging an OBD2 scanner into the diagnostic port of a Chrysler PT Cruiser to read engine codes.
2001 Chrysler PT Cruiser OBD2 Code List
Here is a list of common OBD2 codes that may appear on your 2001 Chrysler PT Cruiser. Please note that this is not an exhaustive list, and not all codes are specific to the PT Cruiser. Codes starting with “P” will be displayed in your odometer if you use the key cycling method.
| Code | What it means |
|---|---|
| P0030 | HO2S Heater Control Circuit Bank 1 Sensor 1 |
| P0036 | HO2S Heater Control Circuit Bank 1 Sensor 2 |
| P0106 | Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem |
| P0107 | Manifold Absolute Pressure/Barometric Pressure Circuit Low Input |
| P0108 | Manifold Absolute Pressure/Barometric Pressure Circuit High Input |
| P0112 | Intake Air Temperature Circuit Low Input |
| P0113 | Intake Air Temperature Circuit High Input |
| P0116 | Engine Coolant Temperature Circuit Range/Performance Problem |
| P0117 | Engine Coolant Temperature Circuit Low Input |
| P0118 | Engine Coolant Temperature Circuit High Input |
| P0121 | Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem |
| P0122 | Throttle/Pedal Position Sensor/Switch A Circuit Low Input |
| P0123 | Throttle/Pedal Position Sensor/Switch A Circuit High Input |
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control |
| P0129 | Barometric Pressure Too Low |
| P0130 | O2 Sensor Circuit Bank 1 Sensor 1 |
| P0131 | O2 Sensor Circuit Low Voltage Bank 1 Sensor 1 |
| P0147 | O2 Sensor Heater Resistance Bank 1 Sensor 2 |
| P0151 | O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 |
| P0152 | O2 Sensor Circuit High Voltage Bank 2 Sensor 1 |
| P0153 | O2 Sensor Circuit Slow Response Bank 2 Sensor 1 |
| P0154 | O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1 |
| P0155 | O2 Sensor Heater Circuit Bank 2 Sensor 1 |
| P0157 | O2 Sensor Circuit Low Voltage Bank 2 Sensor 2 |
| P0158 | O2 Sensor Circuit High Voltage Bank 2 Sensor 2 |
| P0159 | O2 Sensor Circuit Slow Response Bank 2 Sensor 2 |
| P0160 | O2 Sensor Circuit No Activity Detected Bank 2 Sensor 2 |
| P0161 | O2 Sensor Heater Circuit Bank 2 Sensor 2 |
| 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 | Fuel Composition Sensor Circuit |
| P0178 | Fuel Composition Sensor Circuit Low Input |
| P0179 | Fuel Composition Sensor Circuit High Input |
| P0182 | Fuel Temperature Sensor Circuit Low Input |
| P0183 | Fuel Temperature Sensor Circuit High Input |
| P0201 | Injector Circuit/Open – Cylinder 1 |
| P0202 | Injector Circuit/Open – Cylinder 2 |
| P0203 | Injector Circuit/Open – Cylinder 3 |
| P0204 | Injector Circuit/Open – Cylinder 4 |
| 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 |
| P0320 | Distributor Ignition System Engine Speed Input Circuit |
| P0325 | Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor) |
| P0330 | Knock Sensor 2 Circuit Malfunction (Bank 2) |
| 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 |
| P0401 | Insufficient EGR Flow |
| P0403 | Exhaust Gas Recirculation Circuit Malfunction |
| P0404 | Exhaust Gas Recirculation Circuit Range/Performance |
| P0405 | Exhaust Gas Recirculation Sensor A Circuit Low |
| P0406 | Exhaust Gas Recirculation Sensor A Circuit High |
| P0412 | Secondary Air Injection System Switching Valve A Circuit Malfunction |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0432 | Catalyst System Efficiency Below Threshold (Bank 2) |
| P0440 | Evaporative Emission Control System Malfunction |
| 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 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 |
| P0622 | Generator Field Control Circuit Malfunction |
| P0645 | A/C Clutch Relay Control Circuit |
| P0700 | Transmission Control System Malfunction |
| P0703 | Brake Switch 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 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 Circuit Malfunction |
| P0801 | Reverse Inhibit Control Circuit Malfunction |
| P0833 | Clutch Pedal Switch Circuit Malfunction |
| P1192 | Intake Air Temperature Sensor Circuit Low |
| P1193 | Intake Air Temperature Sensor Circuit High |
| P1194 | Heated Oxygen Sensor Heater Circuit Performance Bank1/2 Sensor1 |
| P1195 | Heated Oxygen Sensor Slow Response Bank 1 Sensor 1 |
| P1196 | Heated Oxygen Sensor Slow Response Bank 2 Sensor 1 |
| P1197 | Heated Oxygen Sensor Slow Response Bank 1 Sensor 2 |
| P1198 | Coolant Temperature Sensor Circuit Low |
| P1199 | Coolant Temperature Sensor Circuit High |
| P1281 | Engine is Cold Too Long |
| P1282 | Fuel Pump Relay Circuit |
| P1288 | Manifold Tuning Valve Control Circuit Malfunction |
| P1289 | Manifold Tuning Valve Solenoid Circuit Malfunction |
| P1290 | CNG Pressure Too High |
| P1291 | Heated Air Intake System Malfunction |
| P1292 | Natural Gas Pressure Sensor Voltage Too Low |
| P1293 | Natural Gas Pressure Sensor Voltage Too High |
| P1294 | Target Idle Speed Not Reached |
| P1295 | 5 Volt Reference Circuit Low Voltage |
| P1296 | 5 Volt Reference Circuit Low Voltage |
| P1297 | Manifold Absolute Pressure Sensor and Throttle Position Sensor Inconsistent at Idle |
| P1298 | Rich Condition at Wide Open Throttle |
| P1299 | Manifold Absolute Pressure Sensor and Throttle Position Sensor Inconsistent |
| P1388 | Auto Shutdown Relay Control Circuit |
| P1389 | No ASD Relay Output Voltage at PCM |
| P1390 | Camshaft Position Sensor and Crankshaft Position Sensor Swapped |
| P1391 | Intermittent Loss of CMP or CKP |
| P1398 | Misfire Detected – Crankshaft Position Sensor Variation |
| P1399 | Wait Lamp Circuit |
| P1403 | EGR Solenoid Circuit |
| P1476 | Downstream Airflow Restriction – Aspirator Performance |
| P1477 | Upstream Airflow Restriction – Aspirator Performance |
| P1478 | Battery Temperature Sensor Voltage Out of Range |
| P1479 | Transmission Fan Relay Circuit |
| P1480 | PCV Solenoid Circuit |
| P1481 | Incorrect Misfire Counter Pulse Generator Signal |
| P1482 | Catalyst Temperature Sensor Short to Low |
| P1483 | Catalyst Temperature Sensor Short to High |
| P1484 | Catalytic Converter Overheating |
| P1485 | Air Pump Relay Control Circuit |
| P1486 | Evap System Leak Monitor Pinched Hose Detected |
| P1487 | High Speed Fan Relay Control Circuit #2 |
| P1488 | Auxiliary 5-Volt Output Too Low |
| P1489 | High Speed Fan Relay Control Circuit #1 |
| P1490 | Low Speed Fan Relay Control Circuit |
| P1491 | Radiator Fan Control Relay Circuit |
| 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 |
| P1496 | 5 Volt Supply Output Too Low |
| P1498 | High Speed Fan Relay Control Circuit #3 |
| P1594 | Charging System Voltage Too High |
| P1595 | Speed Control Vacuum Solenoid Circuit or Vent Solenoid Circuit |
| 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 Controller Area Network (ICAN) |
| P1682 | Charging System Line Voltage Too Low |
| P1683 | Speed Control Servo Power Circuit |
| P1684 | Battery Disconnected within Last 50 Starts |
| P1685 | Skim Invalid Key |
| P1686 | No SKIM Bus Messages Received |
| P1687 | No MIC Bus Messages Received |
| P1693 | DTC Detected in Companion Module |
| P1694 | No CCD/J1850 Messages Received from PCM |
| P1695 | No CCD/J1850 Messages Received from BCM |
| P1696 | EEPROM Write Denied/Not Successful |
| P1697 | Unsuccessful attempt to update engine system calibration (SRI) mileage |
| P1698 | No CCD/J1850 Messages Received from TCM |
| P1719 | 2-3 Shift Solenoid Circuit |
| P1740 | Torque Converter Clutch Inductive Signature Malfunction |
| P1756 | Governor Pressure Not Equal To Target @ 15-20 PSI |
| P1757 | Governor Pressure Not Equal To Target @ 0 PSI |
| P1762 | Governor Pressure Sensor Offset Volts Too Low or High |
| P1763 | Governor Pressure Sensor Volts Too High |
| P1764 | Governor Pressure Sensor Volts Too Low |
| P1765 | Trans Relay Always On or Off |
| P1776 | Solenoid Switch Valve Latched in LR Position |
| P1899 | Park/Neutral Switch Stuck in Park or in Gear |
Disclaimer: This code list is for general informational purposes. Always refer to your 2001 Chrysler PT Cruiser’s repair manual or consult a qualified mechanic for accurate diagnosis and repair procedures.
Interpreting and Addressing OBD2 Codes
Once you have retrieved the OBD2 codes from your 2001 Chrysler PT Cruiser, the next step is to understand what they mean and how to address the underlying issue.
- Record the Codes: Write down all the codes displayed. Codes are crucial for diagnosis.
- Look Up the Code Definitions: Use the table provided above or a reliable online OBD2 code database to understand the meaning of each code.
- Understand the Severity: Some codes indicate minor issues, while others point to serious problems that require immediate attention. For example, misfire codes (P0300-P0304) or catalytic converter codes (P0420, P0432) often indicate more significant issues than evaporative emission system leak codes (P0440 series).
- Do Some Initial Troubleshooting (If Comfortable): For simple codes like a loose gas cap (often causing P0440 series codes), you can try tightening the gas cap and clearing the code to see if it resolves the issue. For other codes, you might be able to perform basic checks, such as inspecting vacuum lines or sensor connections.
- Consult a Mechanic: For most OBD2 codes, especially if you are not experienced in auto repair, it’s best to consult a qualified mechanic. They have the expertise, tools, and diagnostic equipment to accurately pinpoint the root cause of the problem and perform the necessary repairs.
Important Considerations:
- Clearing Codes: OBD2 scanners can usually clear codes after reading them. However, it’s generally not recommended to clear codes without understanding and addressing the underlying issue. Clearing codes will turn off the check engine light, but the problem may persist, and the light will likely come back on. Furthermore, clearing codes before a professional diagnosis can erase valuable information that could help the mechanic identify the problem.
- Manufacturer-Specific Codes: Generic OBD2 scanners may not read all codes, particularly those specific to Chrysler’s transmission or other proprietary systems. Dealerships and specialized repair shops have advanced diagnostic tools to access these manufacturer-specific codes if needed.
By understanding how to retrieve and interpret OBD2 codes on your 2001 Chrysler PT Cruiser, you can take a proactive approach to vehicle maintenance and address potential issues efficiently. Remember, this guide is for informational purposes, and professional diagnosis and repair are always recommended for complex automotive problems.
Alt text: The check engine light illuminated on the dashboard of a 2001 Chrysler PT Cruiser, indicating a potential engine or emissions issue.
