P0681 Cylinder 11 Glow Plug Circuit

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0681 code

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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0681 DIAGNOSTIC Get a fair and transparent estimate upfront

P0681 code definition

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.

What the P0681 code means

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.

What causes the P0681 code?

The P0681 code is caused by:

  • Defective glow plug
  • Defective glow plug relays
  • Faulty timer or module in the glow plug
  • Shorted or open circuit
  • Electrical flaws in the circuit for the glow plug
  • Blown fuse (though the cause of the blown fuse must first be detected)

What are the symptoms of the P0681 code?

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.

How does a mechanic diagnose the P0681 code?

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.

Common mistakes when diagnosing the P0681 code

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.

How serious is the P0681 code?

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.

What repairs can fix the P0681 code?

The P0681 code can be dealt with using the following repairs:

  • Checking the codes and attempting to repair any other faulty glow plugs before the #11 cylinder
  • Performing a visual inspection of the wiring and connections, repairing anything showing signs of damage or defect
  • Checking the #11 glow plug connection and using a digital ohm meter to measure the voltage and testing the ground signal. Replacing the glow plug if voltage and ground are present.
  • Testing and replacing fuses in the heater or testing system circuitry if fuses blow once replaced
  • Testing and replacing the timer or relay and/or module if needed and making any electrical repairs
  • PCM replacement should not be needed, but could be the issue

Additional comments for consideration regarding the P0681 code

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.

Need help with a P0681 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P0681
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0681 code.

SCHEDULE P0681 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

Related questions

Error code p1516 with check engine and reduced engine power unable to drive over 30mph car is revving up put no power

The code P1516 is is for the throttle position sensor. It looks like the car's computer is putting the engine in "failsafe mode" to prevent the car from being driven much further. A technician would need to examine the system...

Error code P0171 and P0374

Hi and thanks for contacting YourMechanic. If the vehicle went into limp mode, then the computer is making this happen to prevent the engine from any damage. Check the camshaft sensor for proper timing to the camshaft. Look at the...

My check engine light came on

You can try and have the throttle body and idle control valve cleaned first and code cleared. If the code returns then you will need to have the computer program updated for this code. There is a technical bulletin #13-FL-005....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com