Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0624 Fuel Cap Lamp Control Circuit

P0624 Fuel Cap Lamp Control Circuit

Check Engine Light

P0624 code definition

The P0624 code indicates that there is a problem in the fuel cap lamp control circuit.

What the P0624 code means

The P0624 is an OBD-II generic code that appears when there is something wrong with the fuel cap and it can be identified through various modules, not only the PCM. For example, it can be that the body control module, alternative fuel control module, ABS control module or various other modules have caused the code to be recorded.

What causes the P0624 code?

There are only a few causes for the P0624:

  • Faulty fuel cap
  • Open, shorted or corroded wiring and connections in the controller area network or CAN Bus harness
  • A control module ground strap or wire that has become loose
  • Faulty CAN bus

What are the symptoms of the P0624 code?

There are not many symptoms for the P0624 code, and they will typically include the fuel cap malfunction signal to illuminate, the service engine lamp to light and the code to be stored.

How does a mechanic diagnose the P0624 code?

To assess the P0624 code, the technician uses an OBD-II scanner and considers the data and freeze frame data. They will then clear the fault codes and determine if the code reappears. If so, they do a visual inspection of the wiring to determine if there are any issues, and will then replace or repair components and connections as needed.

They will then retest and if the code persists, they will begin an in-depth electronic diagnosis using a device such as an Autohex or Tech II to identify the area where the electronic malfunction is occurring or where a defective system ground exists.

Common mistakes when diagnosing the P0624 code

A common mistake made when diagnosing the P0624 code is to assume that any stored codes in the freeze frame are the cause of the code in question. This can easily lead you to make unneeded or ineffective repairs. Thorough diagnostics on the CAN Bus are often a wiser approach than operating on scan readings alone.

How serious is the P0624 code?

The P0624 code will not stop a vehicle from operating safely, but it should not be ignored. It is an electrical problem that could be detected through a long list of sensors and modules. Rather than allowing the problem to remain, it is best to take the time to find out where the electrical glitch is occurring.

What repairs can fix the P0624 code?

Fixing the issues that lead to the P0624 code require the following repairs:

  • Validating the code with the scanner and using all of the data to begin addressing the issues that may have caused it to be recorded
  • Clearing the codes and retesting to see if it reappears, and then visually inspecting wiring and connections to repair or replace anything that is in obvious need
  • If these basic steps do not clear the code, it is necessary to consider testing individual control modules
  • The use of a CAN bus tester such as an Autohex or Tech II will identify the area where the problem has occurred, and then it may mean replacing the fuel cap, the control circuits or connections, or the CAN bus itself

Additional comments for consideration regarding the P0624 code

A control module failure is rare, as is a PCM failure. If, however, testing and repairs reveal that there is a need to replace the module, it is of the utmost importance that the testing done identifies the specific module. If it is the PCM it will be necessary to reprogram as well. This is a rarity, though, and the most common issue is typically a faulty fuel cap or a wiring issue that is easily identified and repaired.

Need help with a P0624 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...

Related questions

Q: Q: My '98 expedition, it drives fine for a while, then after a few hours, when sitting still, it idles rough then shuts off.

After some testing done to verify the EGR valve flow to see if the valve is intermittently sticking open causing the stall. This can be done using a scanner with the capability to open and close the EGR valve and...

Q: Can a loose gas cap or driving on really rough roads cause a P0193 error code?

Hi there, thanks for writing in. To answer your question in a simple way: maybe. The P-0193 OBD-II error code is as you indicated, a fuel rail pressure sensor circuit issue. This may have been triggered by the aggressive off-road...

Q: Error code P2187 - 2013 Hyundai Elantra

Hello - the P2187 code indicates a fuel/air mixture that is too lean. This could be caused by a leak in the air intake (the plastic intake tube might be cracked for example), a loose hose on the air intake,...