When to replace the glow plug in a Duramax?

With the igniting OFF and the affected glow plug disconnected, measure the resistance between the affected glow plug terminal of the glow plug and ground with a DMM for less than 1 ohm. If the resistance is more than 1 ohm, replace the affected glow plug.

What is the number on the glow plug?

The 126* number is the newer 9G plug; a 97364968 is the older 61g plug. Use whichever plug you like. Turns out when all is said and done it was a bad glow plug.

What happens when the glow plug is disabled?

If the glow plug controller senses a problem in a glow plug circuit, the glow plug on the affected cylinder will be disabled and the glow plug controller will send an error message to the engine control module (ECM). If this condition exists, the DTC will set.

Where is the p0676 glow plug 6 control circuit?

So the check engine light came on and the P0676 code pulls on the CTS2. Truck is bone stock. I pulled and tested #6 glow plug (third back from the front on the drivers side) and it checked good. Cleaned the glow plug, connecting terminal, and nut. Put it back together and it popped the code again. Wondering what the next step to do is.

The 126* number is the newer 9G plug; a 97364968 is the older 61g plug. Use whichever plug you like. Turns out when all is said and done it was a bad glow plug.

What to do if your glow plug goes bad?

If the resistance is more than 1 ohm, repair the harness. If the resistance is less than 1 ohm, replace the glow plug control module. With the igniting OFF and the affected glow plug disconnected, measure the resistance between the affected glow plug terminal of the glow plug and ground with a DMM for less than 1 ohm.

Can a glow plug be set to ground?

Keep in mind that the glow plug is only part of the circuit and the ENTIRE CIRCUIT must be electrically good. PO676 can set for short to ground or voltage, open or high resistance. If your plug tested to 6 ohms or less, the problem is likely with the circuit, not the plug.

When do you change glow plugs?

Generally speaking, glow plugs should be replaced when you start noticing difficulty in starting. If the engine is starting fine, I would not change them. If the engine becomes hard to start, then it’s time. The glow plug relay will click off quickly, instead of staying on for 5 seconds.

How often should glow plugs be changed?

A glow plug is a heating device used to aid starting diesel engines. On older vehicles replacing the glow plugs should be done once every three years. On vehicles newer than 1996, the Glow Plugs should be Changed once every 60,000 miles.

Should the glow plugs be replaced?

Compare your calculated true resistance value of your glow plug with the factory specification. If the glow plug resistance exceeds the specification or falls out of the acceptable range, then the glow plug must be replaced . Tip: For most glow plugs, the acceptable range for the true resistance value is between 0.1 and 6 Ohms.

What makes glow plugs go bad?

Usually, glow plug failure is due to excessive heat, or high voltages reaching the plug. High voltage can be caused by a controller that is starting to go bad. Additionally, if there is faulty wiring, or a problem with the controller, the glow plug (s) may be receiving power all the time.

When to replace the glow plug in a Duramax?