What is the P0682 fault number? What is the Cylinder 12 Glow Plug Circuit/Open Malfunction description? How do I fix the P0682 fault code What are the symptoms and causes for the P0682 fault code
What is the P0682 Fault code? What does it all mean?
A P0682 code is a way to indicate that you are a professional. “Cylinder 12 Glow Plug Circuit/Open” . This code is set when a malfunction occurs in the cylinder 12-glow plug circuit. The P0682 fault code is triggered if there is more that a 10% difference between the glow plug voltage for cylinder 12 and the manufacturer’s set level.
When the engine is cold, compressed air temperature quickly loses its heat. This problem is solved by a preheating device called a glow-plug. The glow plugs are usually mounted through the cylinder heads as close to the combustion chambers as possible.
The powertrain control module (PCM) controls glow plugs. It monitors coolant and oil temperatures, transmission temperature, and intake air temperature. The PCM activates the glow plug when it detects that the engine has become cold through sensors. Code P0682 is triggered if the PCM detects the glow plug not heating up. This code indicates that the glow plug in cylinder 12 is defective and has been set to indicate that fault.
When the engine is hot, however, glow plugs will not be required. The PCM turns off the glow plug control system when coolant temperature exceeds a threshold to prevent engine damage.
What causes the P0682 Fault code?
The following are the most frequent causes of the P0682 fault code:
- – Defective glow bulb (Cylinder 12).
- – A defective timer or control module for glow plug control
- – In the glow plug circuit, damaged, defective, corroded wires, harnesses or associated connectors
- – A defective glow plug relay
- – Blown fuse
What are the symptoms of P0682 Malfunction Code?
These symptoms may be present in vehicles with code P0682.
- – Illumination for the check engine light
- – Waiting too long before the engine starts
- In cold weather, the engine might not start at all
- – The Preheat light doesn’t turn on or stay on constantly
- – When the vehicle is starting, white smoke comes from the exhaust
- – The engine may lose power while it warms up.
- – Extremely loud engine noise
- Engine misfire
How to Fix the P0682 Fault Code
Diagnose this code first if you find a P0670(Glow Plug Control Module Circuit Malfunction code) along with the code.
There are several repairs that can resolve the P0682 fault code.
- – Repair or replacement damaged, corroded, fused and loose wires
- – Repair and replacement of bent or damaged pins for electrical connectors
- Repairing short or open circuit problems and replacing blown fuse
- Replacing the defective glow plug in cylinder 12
- Relay for a defective glow plug
- – Replacing a faulty timer or glow plug control module
- Clear all codes and test the vehicle. Recheck the PCM to verify that no codes have been reset.
How serious is the P0682 Fault code?
A code P0682 is not likely to prevent a vehicle starting. Even if one spark plug is defective, the engine will continue to run. It is possible to make it more difficult to start the engine in colder conditions, but this can be due to time and temperature changes. This can lead to a decrease in power and acceleration.
