What is the P0671 fault number? What is the Cylinder 1 Glow Plug Circuit/Open Malfunction description? How can I fix P0671 fault codes? What are the causes and symptoms of the P0671 error code?
What is the P0671 Fault code? What does it all mean?
A P0671 code is a way to indicate that you are a professional. “Cylinder 1 Glow Plug Circuit/Open . This code is generated when the powertrain controller module (PCM), detects a fault in the cylinder 1 glowplug circuit.
When the engine is cold, compressed air temperature quickly loses its heat. This problem is solved by a glow plug (preheating element). One glow plug is typically per cylinder. These are installed directly through the cylinder head, as close as possible to the combustion chamber.
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 P0671 is activated if the PCM detects that a glow plug is not heating up. This code usually indicates a fault in the electrical circuit and points at the glow plug in cylinder 1.
Glow plugs are not required when the engine heats up. To prevent engine damage, the PCM disengages the glow-plug control system once coolant temperature has reached a predetermined threshold.
What causes the P0671 Fault code?
These are the most common reasons that P0671 fault codes are triggered:
- – Defective glow plug (Cylinder 1
- – Defective timer or glow plug control module
- – Defective, corroded, or damaged wires, harnesses, and any associated connectors in the glow bulb circuit
- Defective glow-plug relay
- – Blown Fuses
What are the symptoms for P0671 Trouble Code?
You may experience the following symptoms if your vehicle has the code P0671:
- – Illumination at the check engine lights
- – Waiting too long before the engine starts
- In cold weather, the engine might not start at all
- – A Preheat light that does not come on or remains on at all times
- – When the vehicle is starting, white smoke comes from the exhaust
- – You may experience a loss in power until your engine warms up.
- – Unusually loud noises from the engine
- Engine misfire
How do I fix the P0671 fault code?
Diagnose this code first if you find a P0670(Glow Plug Control Module Circuit Malfunction code) along with the code.
The following repairs may be able to resolve the P0671 fault code:
- – Repair and replacement of damaged, corroded or fused wires, and loose connectors
- Repair or replacement of bent pins in electric connectors
- – Repair or replace blown fuses.
- – Replacing the defective glow bulb in cylinder 1
- 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 P0671 Fault Coding?
A code P0671 does not usually prevent a vehicle’s starting. The engine can still run if only one spark plug has failed. It is possible to make it more difficult to start the engine in cold weather. However, this can be caused by time and temperature changes. This can result in a loss of power or acceleration.
