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P0673 is a diagnostic trouble code (DTC) for "Cylinder 3 Glow Plug Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0673 code is a generic powertrain code related to issues with a computer output circuit. In this case, it means that an issues has been noted with the glow plug circuit in cylinder 3 of your engine.
Codes related to the P0673 include:
A glow plug is a device utilized in diesel engines to heat a cylinder head when starting up a cold engine. The diesel engine uses the high level of heat through compression, which quickly ignites the fuel. Each cylinder of the engine has a glow plug to heat the cylinder head.
When a P0673 trouble code is stored, it means that the system reference voltage allowed by the vehicle’s engine control module (ECM) has exceeded 10% of preset variance parameters.
While a glow plug will typically last 100,000 miles, they can fail before that mileage. The glow plug is installed in the cylinder head as close as possible to the cylinders combustion point. Using oil and transmission sensors, the ECM will determine if the glow plug is needed for ignition and grounds the glow plug timer module, which grounds the glow plug relay. Typically, a P0673 code means the glow plug has failed to heat up and could be damaged.
Several problems may cause a P0673 code including:
Symptoms of a P0673 code may include:
A mechanic may use several methods to diagnose a P0673 trouble code, including:
Test glow plug timer, relay, or module
Utilize an OBD-II scanner to check for a stored P0673 trouble code
Check if glow plug will “warm” with battery voltage or test with digital volt/ohmmeter
Test all system fuses to ensure they are in working order with the glow plug heater activated
Test the glow plug after disconnecting it from cylinder 3 and check ground and resistance
Visually inspect wiring, harnesses, and connectors related to the glow plug circuit for damage
If blown fuses are located, there may be an underlying problem beyond what a P0673 code holds, so it is always recommended to repair stored codes in the order in which they appear. Often, glow plug timers and relays are replaced before wiring and the glow plug itself is tested, which can lead to misdiagnosis and unnecessary repairs.
Because a vehicle’s safe driving operation may be impacted due to faults that store a P0673 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a P0673 trouble code and include:
Often, additional glow plug circuit codes will accompany a P0673, so it is recommended to do a full diagnosis and note all trouble codes that may be stored to fully repair the issue.
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