The P2679: Coolant Degassing Valve Control Circuit Low refers to an issue where the voltage in the coolant degassing valve control circuit is lower than expected. This problem can be caused by a malfunctioning valve, issues within the control circuit, or wiring problems, which could impact the engine’s cooling system efficiency.
P2679 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P2679: Coolant Degassing Valve Control Circuit Low |
| Is it serious? | Yes, as low voltage in the control circuit can cause improper valve operation, potentially leading to overheating and engine damage. |
| Possible causes | – Low voltage in the coolant degassing valve control circuit – Faulty valve or control circuit – Wiring or connector issues |
| How to diagnose? | – Measure voltage in the coolant degassing valve control circuit – Inspect the valve and wiring – Check for shorts or damage in connectors – Replace components as needed |
P2679 Meaning
The P2679: Coolant Degassing Valve Control Circuit Low code indicates that the voltage in the coolant degassing valve control circuit is lower than the required level, which might result from problems with the valve, the circuit, or faulty wiring or connectors. Proper operation of the coolant degassing valve is essential to maintain the correct coolant levels and prevent overheating, so a low voltage issue needs prompt attention.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to identify any additional codes that might indicate related cooling system issues. | OBD-II Scanner |
| Measure Voltage in Control Circuit | Use a multimeter to measure the voltage in the coolant degassing valve control circuit. Compare it to the manufacturer’s specifications to verify if the voltage is too low. | Multimeter |
| Inspect the Coolant Degassing Valve | Check the valve for signs of malfunction or failure. Make sure it is not stuck and operates freely when activated. | Flashlight, Safety Gloves |
| Check Wiring and Connectors | Inspect the wiring and connectors for any signs of damage, loose connections, or corrosion that may cause low voltage. Repair as necessary. | Flashlight, Multimeter |
| Inspect for Short Circuits | Check for any shorts to ground in the control circuit that might be causing the voltage drop. Use a multimeter to test for continuity issues. | Multimeter |
| Replace Faulty Components | Replace any faulty components found during the inspection, including a defective coolant degassing valve, damaged wiring, or connectors. | Replacement Parts |
| Clear the Code and Test System | After repairs are completed, clear the error code using an OBD-II scanner. Perform a test drive to verify that the voltage in the control circuit is within the correct range. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the vehicle to ensure that the P2679 code has not returned, confirming that the coolant degassing valve system is operating correctly. | OBD-II Scanner |
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