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P0681 is a diagnostic trouble code (DTC) for "Cylinder 11 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.
A P0681 code means that the powertrain control module sensed a problem in the glow plug circuit for the engine cylinder #11. However, this code is often recorded along with other glow plug circuit codes, and it is important to repair them in the order received.
P0681 is an OBD-II generic code that appears when a variation in the voltage exceeds 10% of the manufacture's specifications. This is a code that will appear strictly in vehicles with diesel engines as the glow plugs are used to pre-heat the engine's cylinders to allow the diesel fuel to ignite in colder conditions. The glow plugs use battery voltage to become heated, and the code is generated if there is a problem in cylinder 11's plug function.
The P0681 code is caused by:
When the P0681 code appears, it is often accompanied by such symptoms as the glow plug indicator on the dash, difficulty getting the engine to start, heavy white smoke and/or increased noise at start up, misfiring of the engine, and the check engine indicator.
To diagnose the P0681 code, the mechanic or technician must use the OBD-II scanner and verify the information. They will need to clear the code and retest the vehicle, and use the freeze frame data to determine the order in which codes have recorded as this is important in dealing with glow plug issues, which may occur in multiples.
The technician examines the wiring and connections, making repairs are needed and then tests for the codes. The individual glow plug is tested for voltage and replaced if needed. Fuses are also tested with the heater activated and replaced if needed. System circuitry is also tested, and the relay, timer and module are also tested with any components replaced as needed.
It is a common mistake for the technician to replace the glow plug relays and timers prior to diagnosing and testing the system. They should test connections, glow plugs and wiring before making any repairs.
Though the P0681 code alone may not prevent the vehicle from operating, if there are multiple glow plug codes, it is indicative of a serious problem. It could leave the vehicle in a no-start or low performance condition, especially in cold weather.
The P0681 code can be dealt with using the following repairs:
There is usually no issue with the PCM, though it is not impossible. This is the last item to test if all of the diagnostics and tests of the #11 cylinder glow plug reveal no reason for the code to have appeared.
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