When the check engine light illuminates on your Cadillac's dashboard, it's using a built-in diagnostic system to alert you that something needs attention. These alerts are communicated through specific codes known as On-Board Diagnostics II (OBD-II) codes, each indicating different issues ranging from minor sensors malfunctioning to more serious engine problems. Let's see what the Cadillac check engine light codes are.
What are Cadillac Check Engine Light Codes?
Cadillac check engine light codes have been part of the OBD-II system standard in vehicles since the mid-1990s. These codes are universal in many respects, though some might be specific to Cadillac or particular models.
Cadillac Check Engine Light Codes
Below is a table of common Cadillac OBD-II codes and their descriptions:
| OBD-II Code | Description |
| P0011 | Camshaft Position - Timing Over-Advanced |
| P0014 | Camshaft Position - Timing Over-Advanced |
| P0021 | Camshaft Position - Timing Over-Advanced |
| P0024 | Camshaft Position - Timing Over-Advanced |
| P0341 | Camshaft Position Sensor Circuit Range/Performance |
| P0346 | Camshaft Position Sensor Circuit Range/Performance |
| P0336 | Crankshaft Position Sensor A Circuit Range/Performance |
| P0391 | Camshaft Position Sensor B Circuit Range/Performance |
| P0300 | Random/Multiple Cylinder Misfire Detected |
| P0305 | Cylinder 5 Misfire Detected |
| P0101 | MAF sensor circuit out of expected range. |
| P0102 | MAF sensor circuit low input, indicating low airflow. |
| P0103 | MAF sensor circuit high input, indicating high airflow. |
| P0113 | IAT sensor circuit high input, indicating hot intake air. |
| P0118 | ECT sensor circuit high input, potentially overheating. |
| P0122 | Throttle position sensor low voltage, affecting engine idle and acceleration. |
| P0123 | Throttle position sensor high voltage, causing erratic engine behavior. |
| P0171 | System too lean (Bank 1), too much air or insufficient fuel. |
| P0174 | System too lean (Bank 2), similar to P0171 but in the second engine bank. |
| P0301 | Cylinder 1 Misfire Detected |
| P0302 | Cylinder 2 Misfire Detected |
| P0303 | Cylinder 3 Misfire Detected |
| P0304 | Cylinder 4 Misfire Detected |
| P0306 | Cylinder 6 Misfire Detected |
| P0307 | Cylinder 7 Misfire Detected |
| P0308 | Cylinder 8 Misfire Detected |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0430 | Catalyst System Efficiency Below Threshold (Bank 2) |
| P0442 | Evaporative Emission System Leak Detected (small leak) |
| P0446 | Evaporative Emission Control System Vent Control Circuit Malfunction |
| P0455 | Evaporative Emission Control System Leak Detected (gross leak) |
| P0507 | Idle Control System RPM Higher Than Expected |
| P0601 | Internal Control Module Memory Check Sum Error |
| P0606 | PCM Processor Fault |
| P0700 | Transmission Control System Malfunction |
| P0717 | Input/Turbine Speed Sensor Circuit No Signal |
| P0722 | Output Speed Sensor Circuit No Signal |
| P0741 | Torque Converter Clutch Circuit Performance or Stuck Off |
| P0748 | Pressure Control Solenoid Electrical |
These codes provide a starting point for diagnostics, but they don't necessarily pinpoint the exact part or repair needed. Mechanics use these codes as clues in a larger diagnostic process to find and fix the underlying problem.
Understanding these codes can give you insight into what might be wrong with your Cadillac, but due to the complexity and potential severity of some issues, professional diagnosis and repair are often necessary. If your Cadillac's check engine light comes on, consider taking it to a certified service center like Colonial Cadillac, where experienced technicians can provide a precise diagnosis and quality repair services.
How to Read Cadillac Check Engine Light Codes
To read Cadillac check engine light codes, you will need an OBD-II scanner. Here's a brief guide:
- Locate the OBD Port: Typically, this port is located under the dashboard near the steering column.
- Connect the OBD-II Scanner: Plug the scanner into the port. Ensure the ignition is on but the engine is not started.
- Read the Codes: Follow the scanner's instructions to read the codes. These will be alphanumeric and will indicate specific issues your vehicle might be facing.
Common Causes of a Check Engine Light
A check engine light can be triggered by a variety of issues ranging from minor to more severe. Here are some common causes:
- Sensor Malfunction: Key sensors such as the oxygen sensor, mass airflow sensor, or throttle position sensor can fail, leading to an illuminated check engine light.
- Electrical System Problems: Electrical issues, including wiring problems and faults in the electronic control unit (ECU), can cause the light to turn on.
- Catalytic Converter Issues: A failing catalytic converter can trigger the light. It may not process exhaust gasses efficiently, which is detected by the system's sensors.
- Faulty or Loose Gas Cap: A gas cap that is not sealed properly can cause fuel vapors to leak out, prompting the check engine light to turn on due to fuel system pressure discrepancies.
- Vacuum Leaks: Vacuum leaks in the engine can lead to a range of engine performance problems, triggering the check engine light.
Get Your Cadillac Serviced at Colonial Cadillac
If your check engine light is on, don't hesitate to bring your Cadillac to Colonial Cadillac in New London, CT for professional diagnostic and repair services. Our expert technicians are equipped with the latest tools and training to accurately diagnose any issues and ensure your vehicle is performing at its best.
