Guide To P0682 OBD Error Code Solutions

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Is your Check Engine Light illuminated on the car’s dashboard? Are you experiencing sudden drop in the fuel economy with stalling of the engine? Or is there any smoke coming from the exhaust pipe? Then, there might be a possibility of an issue with the Cylinder 12 Glow Plug Circuit of the car thus indicating OBD Code P0682 error.

OBD-II Code P0682 is defined as a Cylinder 12 Glow Plug Circuit/Open.

OBD Code P0682 means that the system reference voltage allowed by the vehicle’s engine control module (ECM) has exceeded 10% of pre-set 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 cylinder’s 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 P0682 code means the glow plug has failed to heat up and could be damaged.

Error Code P0682 means that there’s a problem in the glow plug circuit, causing cylinder 12 glow plug to fail from heating up. This will require a complete and thorough inspection to locate the fault.

What causes this problem with the Cylinder 12 Glow Plug Circuit?

• Faulty glow plugs
• Faulty glow plug relay
• Bad glow plug timer or module
• Shorted or open wiring in the glow plug circuit
• Loose or corroded electrical connectors in the glow plug circuit
• Blown fuses

1. Glow Plug - Inspect for fault in the Cylinder 12 Glow Plug and replace if needed. Buy new glow plug now!
2. Glow Plug Connector - Damaged connectors in relation to cylinder 12 glow plug must be replaced, if found so. Buy new connector now!
3. Glow Plug Relay - Damaged glow plug relay of cylinder 12 must be inspected properly and replaced as required. Buy new relay now!
4. Starter Relay - Engine starting problem can also be caused due to problem in the starting parts. Buy new starter relay now!
5. Engine Wiring Connector - Inspect for engine wiring and connectors and replace faulty components now!
6. Powertrain Control Module - Faulty PCM can easily distorted engine timing causing frequent halting. Find all the Powertrain related parts with us.
7. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.
8. Engine Control Module - OBD Error Code P0682 can also be due to faulty ECMs. It’s better to get the faulty electricals replaced as soon as possible.

Willing to know some common symptoms of OBD Code P0682? Your wish is our demand. Have a look at them below:

Common Symptoms

• Engine hard to start or may not start at all in cold weather
• Lack of power until the engine heats up sufficiently
• Engine may miss due to the colder than normal cylinder head temperature
• Engine hesitating when accelerating
• No pre-heat period, or in other words the preheat light does not go off.

We have listed out some ways which would help you to correct the occurrence of OBD Code P0682. They are mentioned here as follows:

• Glow Plug Replacement
• Glow Plug Relay Replacement
• Starter Relay Replacement
• Glow Plug Connector Replacement

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of Glow Plug Relay, Glow Plug Timer, Electrical Component, Glow Plug Circuit, PCM, Engine, Starter Relay and many more. Now all your problems would vanish within no time.

This Code is Related To P0670, P0671, P0672, P0673, P0674, P0675, P0676, P0677, P0678, P0679, P0680 and P0681.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• You will need a digital volt ohm meter (DVOM) for the complete test. Continue through the tests until the problem is confirmed. You will also need a basic OBD code scanner to reset the computer and erase the code.
• Check the glow plug by disconnecting the wire connector on the plug. Place the DVOM on ohms and place the red lead on the glow plug terminal and the black lead on a good ground. The range is .5 to 2.0 ohms (verify the measurement for your application by referring to a factory service manual). If it is out of range replace the glow plug.
• Check the resistance in glow plug wire to the glow plug relay buss bar on the valve cover. Notice the relay (looks like a starter relay) has a large gauge wire leading to a buss bar where all the glow plug wires are attached.
• Test the wire to the number one glow plug by placing the red lead on the buss bar number one wire and the black lead to the glow plug side. Again, .5 to 2.0 ohms with 2 ohms being the highest resistance. If it’s higher replaced the wire lead to the glow plug from the buss bar. Notice also that these leads from the buss bar to plugs are fusible links.
• Reconnect the wires. Check the same wires for looseness, cracks or missing insulation. Connect the code scanner to the OBD port under the dash and turn the key to the "on" position with the engine off. Clear the codes. Test drive the vehicle and see if the error code returns. If all the components are functioning properly, the code should not return now and the error problem must be resolved.

Common Mistakes When Diagnosing the P0682 Code

• Glow plug relay failure
• Glow plug connector fault
• Glow plug control module failure
• Glow plug failure
• Glow plug wiring harness failure
• Engine connection failure
• PCM failure