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Glow Plug

Hi there. If the relay is clicking, then there is power to the glow plug controller. Remove one of the glow plugs and look at it. If the glow plug is white and has some blue on the rod, then...

Hi there. With newer diesel engines and the advanced timing systems they have, the importance of fully functional glow plugs (https://www.yourmechanic.com/article/symptoms-of-bad-or-failing-glow-plugs) once the motor is lit is less important. However, as the weather gets colder, starting a diesel engine with...

Hi there. Either the drainage holes are blocked, or ECU housing seal is damaged causing water to enter the ECU housing. Take a look around the ECU and see if there is any standing water or moisture areas. If there...

Hi there. There could be an issue with the glow plug circuits. Either the glow plugs have stopped working or the controller / timer has lost power. Check the glow plug relay and see if it's energizing the controller /...

Hi there. If the codes for the engine are coming up with the glow plug control module failure, then check the module to see if there is any wiring burned or broken. If there is nothing wrong with the harness...

Hi there. The glow plug module will effect all the glow plugs not just 2, 3, and 5. I recommend replacing the glow plugs and the harness to the glow plugs. This is similar to replacing plugs and wires (same...

Hi there. The glow plug light comes on when the computer is detecting an issue with the glow plugs to the engine. There are stored codes and pending codes. If the light goes out after turning the key off and...

The little orange light that looks like a spring is the Glow Plug Warning Light. But when it comes on, it doesn't necessarily mean you have a problem with your glow plugs. Like the check engine light, it means that...

The glow plug warning light doesn't necessarily mean the car needs glow plugs. The engine control unit turns on the light to alert you that it has detected a fault in some component of the system, not just the glow...

Hi there. Check the glow plug control relay to see if it is malfunctioning. This is a common part to fail on the diesel engines. The light is coming on for a the computer seeing that the engine is too...

Hello. The starting issue (https://www.yourmechanic.com/services/car-is-hard-to-start-inspection) you are having could very well be caused by the glow plug circuit. It may not be the glow plugs themselves (although it could be), but rather the wires and other parts of the circuit...

Like the Check Engine Light, the glow plug light on late model diesels can come on to indicate a problem in the engine control system. Even when the light is out, there should be a trouble code stored in the...

Hi there. The glow plugs are designed to help start the engine even when the engine is hot. If the code is on for the glow plugs, check the glow plug relay and timer and see if its energizing as...

Hi there. The controller to the glow plugs is malfunctioning and tripping the ECM (computer) and telling it that the engine has stalled. I recommend replacing the glow plug controller / timer unit (https://www.yourmechanic.com/services/glow-plugs-timer-replacement). If you need further assistance with...

Hi there. Check the glow plug circuits and the timer circuit to the glow plugs. The block heater should be plugged in during cold weather if the vehicle is left outside. The glow plugs are to heat up the cylinders...

Hi - there are a few other component problems that could be causing your poor cold starting (https://www.yourmechanic.com/article/symptoms-of-bad-or-failing-glow-plugs). One or more failed glow plugs and air leaks in the air intake will cause poor cold-start and cold-running behavior. I would...

Hello - the failure to get a "glow plug light" upon startup is most likely a fuse or switch issue, failing from repetitive use over time. Check these first. Also possible that one or more of the glow plugs (https://www.yourmechanic.com/question/changing-the-glow-plugs-by-steven-d)...

Hi there. The issue with the 6.0 L diesel engines is that they are to work fine in all conditions, but when the glow plug relay or the circuits fail, the computer will put the engine into limp mode causing...

Hi there. Check the glow plug relay and see if its plugged in. Check the circuits to the glow plugs and see if there is power to them when the key is turned on. The circuit to the glow plugs...

The glow plugs on every vehicle that I have ever worked on that come on when the key is turned on will have a timer unit. This timer unit limits how long the glow plugs will stay on each time...