P037F Glow Plug Sense Circuit High
OBD-II Trouble Code Technical Description
Glow Plug Sense Circuit High
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles that have glow plugs (diesel engine vehicles). Brands of vehicles may include but are not limited to Ford, Dodge, Mazda, VW, Ram, GMC, Chevy, etc. Although generic, the specific repair steps may vary depending on make/model/engine. Anecdotally this code seems more common on Ford vehicles.
The glow plugs and their associated harnesses and circuits are part of a system that is responsible for generating heat in the combustion chamber prior to cold startups.
Essentially , the glow plug is similar to an element on a stove-top. These are incorporated in diesel engines because diesel engines do not use a spark plug to ignite the fuel/air mixture. Rather, they use compression to generate enough heat to ignite the mixture. For this reason, diesel engines need the glow plugs’ help on cold starts.
The ECM throws P037F and associated codes when it monitors a condition outside of a specific range within the glow plug circuit. Most of the time, I would say this would be an electrical issue but some mechanical problems could affect your glow plug circuit on some makes and models. P037F Glow Plug Sense Circuit High code is set when the ECM monitors one or more high electrical value within the circuit.
An example of a glow plug:
NOTE: If other dash lights are currently illuminated (e.g.: traction control, ABS, etc.), this may be a sign of another potentially bigger problem. In this case, you should bring your vehicle to your reputable shop where they can plug in with a proper scan tool to avoid doing any unnecessary harm.
This trouble code is closely related to P037D and P037E.
What is the severity of this DTC?
Generally speaking, the severity of this code would be moderate but depending on the scenario, it may be severe. For example, if you reside in moderate to extreme cold conditions, repetitive cold starts with malfunctioning glow plugs will eventually cause unnecessary damage to your internal engine components.
What are some of the symptoms of the code?
Symptoms of a P037F engine code may include:
What are some of the common causes of the code?
Causes for this code may include:
What are some troubleshooting steps?
Be sure to check for technical service bulletins (TSBs) for your vehicle. Getting access to a known fix can save you time and money during diagnosis.
Tools
Whenever you are working with electrical systems, some of the basic tools that are a good idea to have are:
Safety Tips
Basic Step #1
First thing i would do in this situation, would be pop the hood and smell for any kind of irregular burning scents. If present, this may be the trail to your problem. Most times, if there is excessive burning smells it means something is overheating. Carefully follow the smell, if you see any burnt wire coatings or melting plastic around fuse boxes, fusible links, etc. this will need to be addressed first.
NOTE: Visually inspect all ground straps and look for corroded or loose ground connections.
Basic Step #2
Locate and follow the glow plug circuit harness. These harnesses are exposed to extreme heats that may damage wire looms which are there to protect your wires. Especially keep an eye for any spots the harness that may rub on the engine or other components. Repair any damaged wires or looms.
Basic Tip #3
If possible, disconnect your glow plug harness from the plugs. In some cases, you can disconnect it from the the other side of the harness as well and remove it completely from the vehicle as an assembly. If this is the case, You can use your multimeter to verify continuity in the individual wires of the circuit. This would rule out and kind of physical problem within that harness. In some vehicles, this may not be possible. If not, skip step.
NOTE: Make sure to disconnect battery before performing any electrical repairs.
Basic Step #4
Test your circuits. Refer to manufacturer for specific desired electrical values. Using your multimeter there may be numerous tests you could perform to verify the integrity of the circuits involved.
Basic Step #5
Test your glow plugs. Unplug harness’ from plugs. Using your multimeter set to Voltage, you will attach one end to the positive battery terminal and using the other end, you will touch the tip of each plug. The values should be the same as battery voltage, if they are not, this would indicate a problem within the plug itself. This may vary depending on make and model of your particular vehicle, so ALWAYS refer to manufacturer service information FIRST.
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"Delete Error Code Permanently, Disable DTC Error Code Function for p037f in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p037f and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p037f.
