The P245C: Exhaust Gas Recirculation Cooler Bypass Control Circuit Low code indicates that the voltage in the EGR cooler bypass control circuit is lower than expected. This may result from a faulty EGR cooler bypass control valve, wiring issues, or connector problems, potentially affecting the effectiveness of the EGR system.
P245C – Quick Overview
| Code | Information |
|---|---|
| Meaning | P245C: Exhaust Gas Recirculation Cooler Bypass Control Circuit Low |
| Is it serious? | Moderate – low voltage in the control circuit can prevent proper operation of the EGR bypass valve, resulting in insufficient cooling and increased emissions. |
| Possible causes | – Low voltage in the EGR cooler bypass control circuit – Faulty control valve – Wiring or connector issues |
| How to diagnose? | – Measure voltage in the EGR cooler bypass control circuit – Inspect and test the control valve and wiring – Replace faulty components if needed |
P245C Meaning
The P245C: Exhaust Gas Recirculation Cooler Bypass Control Circuit Low code indicates that there is insufficient voltage in the control circuit for the EGR cooler bypass valve. This low voltage can prevent the EGR bypass valve from functioning as required, which can lead to improper exhaust gas cooling and increased nitrogen oxide (NOx) emissions. The issue could be due to a faulty control valve, problems in the wiring, or connector issues that create an open or shorted circuit.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if there are additional related fault codes. These may help provide more context about issues affecting the EGR or related systems. | OBD-II Scanner |
| Inspect the EGR Cooler Bypass Valve | Visually inspect the EGR cooler bypass valve for any signs of physical damage or corrosion that could affect its ability to operate properly. | Flashlight, Safety Gloves |
| Measure Voltage in the Control Circuit | Use a multimeter to measure the voltage at different points within the EGR cooler bypass control circuit. Ensure the voltage matches the manufacturer’s specifications and identify if it is below the expected range. | Multimeter |
| Check Wiring and Connectors | Inspect all wiring and connectors associated with the EGR cooler bypass valve. Look for loose connections, fraying, or corrosion that could lead to voltage drops. | Flashlight, Multimeter |
| Test the Control Valve Functionality | Use a diagnostic tool to command the EGR bypass valve open and close. Observe if the valve responds properly and ensure it operates within specifications. | Diagnostic Tool |
| Repair or Replace Damaged Wiring or Connectors | If any damaged wiring or connectors are found, repair or replace them to restore normal voltage levels and ensure stable operation of the control circuit. | Wiring Repair Kit, Connector Tools |
| Replace Faulty Components | If the bypass valve itself is faulty or unresponsive, replace it with a new one to restore normal operation of the EGR cooler bypass system. | Replacement Bypass Valve, Wrench Set |
| Clear the Code and Test Drive | After completing repairs, use an OBD-II scanner to clear the P245C code. Take the vehicle for a test drive to ensure the bypass valve operates correctly and that the voltage remains within the correct range. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the vehicle after the test drive to confirm that the P245C code has not returned. If the code persists, further investigation will be necessary to identify and rectify any remaining issues. | OBD-II Scanner |
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)