When it comes to diagnosing issues with a Chevrolet vehicle, the code P145C is often used to indicate an issue with the Evaporative Emission (EVAP) System Leak Detection Pump. This code will be triggered when the EVAP leak detection pump is commanded on during the first reference orifice vacuum measurement and the stabilized EVAP leak detection pump pressure sensor vacuum reading is less than 0.1 kPa (0.01 PSI) for greater than 6 minutes. It can also be triggered when the EVAP leak detection pump is commanded on during the second reference orifice vacuum measurement and the stabilized EVAP leak detection pump pressure sensor vacuum reading is less than 0.1 kPa (0.01 PSI) for greater than 30 seconds. Other conditions must be met in order for this code to be set, such as the propulsion system not being active, the EVAP purge valve being closed, the EVAP vent solenoid valve being closed, the EVAP Leak Detection Pump switching valve being in the vent position, and the odometer being greater than 16 km (10 mi). Depending on the vehicle’s speed and fuel level, this code may trigger in one of three time windows: 5.0, 7.0 or 9.5 hours.
Causes and Solutions for Chevrolet Code P145C
| Causes | Solutions |
|---|---|
| The EVAP leak detection pump is commanded ON during the first reference orifice vacuum measurement and the stabilized EVAP leak detection pump pressure sensor vacuum reading is less than 0.1 kPa (0.01 PSI) for greater than 6 min. | Check for any blockage in the EVAP system, replace the EVAP leak detection pump, and check for any other codes. |
| The EVAP leak detection pump is commanded ON during the second reference orifice vacuum measurement and the stabilized EVAP leak detection pump pressure sensor vacuum reading is less than 0.1 kPa (0.01 PSI) for greater than 30 s. | Install a new EVAP leak detection pump, check for any other codes, and inspect the EVAP system for any leaks. |
| Propulsion system is active | Check the fuel system and electrical components for any faults. |
| EVAP purge valve is closed | Replace the EVAP purge valve, inspect the EVAP system for any blockages, and check for any other codes. |
EVAP Leak Detection Pump
The EVAP leak detection pump is a key component of the Chevrolet Code P145C system. It is responsible for detecting leakages in the EVAP system and triggering the code when there is a problem. The pump must be in the correct position and have the correct pressure reading to detect any leaks in the system. If the pump is not in the correct position or the pressure reading is too low, the code will be triggered.
Propulsion System
The propulsion system must also be in the correct state for the Chevrolet Code P145C to be triggered. If the system is active, the code will be triggered. This means that the fuel system and electrical components must be checked for any faults. If any faults are found, they must be corrected before the code can be cleared.
EVAP Purge Valve
The EVAP purge valve is another important component of the Chevrolet Code P145C system. If the valve is closed, the code will be triggered. To fix this issue, the valve must be replaced and the EVAP system must be inspected for any blockages. Any other codes must also be checked before the code can be cleared.
Conclusion: Troubleshooting Chevrolet Code P145C
Troubleshooting Chevrolet Code P145C can be a complex task due to the various components involved. The EVAP leak detection pump, propulsion system, and EVAP purge valve must all be in the correct state for the code to be triggered. If any of these components are faulty, the code will be triggered. To fix the issue, the faulty components must be replaced or repaired and any other codes must also be checked. When troubleshooting Chevrolet Code P145C, it is important to be thorough and check all components of the system to ensure that the issue is resolved.
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