What is the P0670 fault code What is the description for the Glow Plug Control Module Circuit Malfunction How do you fix the P0670 fault code What are the symptoms and causes for the P0670 error code?
What is the P0670 Fault code? What does it signify?
A code P0670 is triggered if the powertrain controller module (PCM), detects a problem within the glow plug control control module (GPCM), or its circuit.
Diesel engines don’t have spark plugs, unlike gasoline engines. An important component known as a “A” is instead used. “glow plug” Or “ A glow plug is used. Glow plugs can be used to heat the fuel/air mixture when it is below the minimum operating temperature. This allows the mixture ignite and to burn more efficiently.
The following components make up a typical circuit for controlling glow plugs:
- – Battery
- – Ignition key
- – The glowplug control module communicates with the other modules in CAN bus.
- – Cables & connectors
- – Fuses and relay
- – Engine coolant temperature sensor(s)
- – Wires connecting each glowing plug to the control module for glow plugs (in some applications, one wire is connected in parallel).
- Glow plugs
The compression of the mixture is what causes it to ignite in diesel engines. It’s also possible to heat it adiabatic (thermodynamic changes without heat exchange) as the pistons move up. The high pressure fuel is instilled into the cylinder once the piston has reached the top of the cylinder. The superheated (600 degree) air ignites instantly and pushes down the piston.
The diesel-air-fuel mixture can be difficult to ignite in cold conditions and when the engine is being started for the first time. In each cylinder’s combustion chamber, there are glow plugs that are heated electrically to help with ignition of the diesel-fuel mixture.
When the ignition switch is turned on, the glow plug control begins. The PCM activates the glow plug circuit using information from the engine coolant temperature sensor. If the PCM detects a lower engine coolant temperature than the preprogrammed threshold it activates circuit via the glowplug control module.
Vehicles with a glow-plug control module have the advantage of supplying current to each glowplug separately. This is in contrast to older control systems which supply electricity to all glowplugs simultaneously. The control module is able to sense electrical resistance in all glow-plugs and can provide varying amounts of current. This allows for even heating and more efficient combustion. The warm-up time is reduced, which increases the lifespan of the starter motor. Comparatively, systems from the past took as long as 10 seconds to heat glow plugs (sometimes even longer), while modern systems take only 3 seconds to heat them.
All these explanations will show you that glow plugs, and the components and circuits they contain, are critical to diesel engines. A malfunction in the system could cause a cold engine not to start or make it run harder. The PCM or other control modules can set fault code P0670 if the glow-plug control circuit fails. This will also cause a special warning light to be lit.
The P0670 fault code can affect vehicles of all makes and models, including but not limited to Ford, Volkswagen, Renault or Volvo, Volvo, Nissan, Suzuki Mercedes-Benz, Mercedes-Benz.
What is the P0670 Fault Code?
Below are some reasons to set fault code P0670:
- – The glow plug circuit is damaged, burned, shorted or disconnected by corroded wires and/or connectors
- – Dead or weak battery
- – Blown fuse
- – Defective glowplug relay
- – Defective control module for glow plugs
- – Defective engine coolant temperature sensor(s)
- – A defective ignition switch
- – A few failed glow plugs. However, it is not common for all glow plugs fail simultaneously.
- – Low probability of a PCM being faulty or needing to be reprogrammed
What are the symptoms of P0670 malfunction code?
These symptoms may be present in vehicles with code P0670
- – Illumination for the check engine light
- – The glowplug warning light is now on
- It can run very hard, or even not at all, in cold weather and/or when it is cold.
- – Engine misfires at idle
- – The engine might knock until it reaches a comfortable operating temperature
- – Exhaust smoke is white.
- – A decreased engine performance (low power, slow acceleration).
- – Increased fuel consumption
How do I fix the P0670 fault code?
It is a common error to replace the glow plug without performing the required checks. The new glow plug may seem to work better, but if there is an underlying problem, you might need to visit the mechanic again.
There are several repairs that can resolve the P0670 fault code.
- – Replacing damaged wires or connectors to the circuit controlling the glow plug light control module.
- – Replacing a dead or weak battery
- – Repair of blown fuse
- Relay for a defective glow plug
- – Replacing a faulty glow plug control unit
- – Replacing defective glow plugs
- – Fixing issues with the ignition switch
- – Check and replace, if necessary the engine coolant temperature sensor
- – Reprogramming and replacing the PCM (rarely).
How Serious Is the P0670 Fault Code
The P0670 fault code is not dangerous for your safety and life. But, the problem will cause engine performance problems and weaken your vehicle’s ignition. It is important to address this issue immediately.
