2007 Mitsubishi Galant Engine Fuse Box: Solving Electrical Gremlins and No-Start Issues

Symptoms of a Failing 2007 Galant Engine Fuse Box

A problem with the engine fuse box can manifest in many ways, often mimicking the failure of other parts. Because it supplies power to so many different systems, symptoms can be intermittent and difficult to diagnose. Look for these common warning signs.

1. Engine Will Not Crank or Start

This is one of the most common symptoms. If the main power relay or the relay for the fuel pump or starter fails within the fuse box, the engine may not get the power it needs to start. You might turn the key and hear a click, or nothing at all. This can also be caused by a dead battery or a bad starter, but if those have been ruled out, the fuse box is a likely suspect.

2. Multiple Unrelated Electrical Failures

If you suddenly experience several electrical issues at once—for example, the radio won't turn on, the power windows don't work, and the headlights are dead—it points to a systemic power loss. This often traces back to a main fusible link or a major internal fault within the fuse box, which acts as the central hub for all these circuits.

3. Intermittent Electrical Problems

Do your headlights flicker? Does the air conditioning work one day but not the next? Intermittent issues are frequently caused by poor connections. Corrosion inside the fuse box, either on the terminals where relays plug in or on the internal circuit board, can cause these frustrating, on-and-off problems. The connection may be just good enough to work sometimes, but fail with vibration or temperature changes.

4. Visible Corrosion or Melting

A visual inspection can often confirm a bad fuse box. Open the lid and look for a white or greenish powdery substance on the metal contacts for the fuses and relays. This is a clear sign of corrosion, often caused by water intrusion. Also look for any signs of melted plastic around a specific fuse or relay socket, or a burnt smell, which indicates a severe overload or short circuit that has damaged the box itself.

5. Specific OBD-II Trouble Codes

The fuse box itself does not have a sensor and will not generate its own trouble code. However, its failure will cause other modules to report errors. If the fuse box fails to supply power to a component, you will get a code for that component's circuit. Common related codes include:

• P-codes for circuit failures: Codes like P0230 (Fuel Pump Primary Circuit) or P0480 (Cooling Fan 1 Control Circuit Malfunction) can be triggered if the corresponding relay or fuse in the box has failed.
• U-codes for communication loss: If the fuse box cuts power to a major control module like the PCM or Transmission Control Module (TCM), you may see codes like U0100 (Lost Communication With ECM/PCM) or other U-series codes.
• Mitsubishi-specific codes: A code like P1751 (A/T Control Relay) points directly to a relay housed within the fuse box.

Buying a Used 2007 Galant Engine Fuse Box

Since new aftermarket fuse box assemblies are generally not available and new OEM units can be expensive or discontinued, a quality used OEM fuse box is often the best solution. Here’s what to look for.

1. Verify The Part Number and Engine Type

This is the most critical step. Before you buy, locate the part number on your original fuse box. It is typically stamped on the side or lid. Match this number exactly. The known OEM part numbers for the 3.8L V6 model are 8501A302, 8501A554, MU8501A302, and MU8501A554. Ensure the donor vehicle had the same engine (3.8L V6 or 2.4L I4) as yours. Do not trust a listing that says a part fits both.

2. Inspect for Corrosion and Water Damage

Ask the seller for clear, well-lit photos of the inside of the fuse box. Look closely at the metal terminals where the fuses and relays plug in. Avoid any unit that shows signs of white or green powder, rust, or water marks. A clean, dry fuse box from a vehicle in a dry climate is always preferable.

3. Check for Physical Damage

Inspect the plastic housing for cracks, especially around the mounting tabs. Check the large electrical connectors on the bottom or sides. Ensure none of the plastic is broken and that all the pins inside are straight and clean. A broken connector or mounting tab can make installation impossible.

4. What's Included?

Most used fuse boxes are sold as the housing only. They typically do not include the fuses, relays, or fusible links. You will need to transfer these components from your old fuse box to the new one. This is generally a good practice anyway, as you know the history of your own relays. If your old box was damaged by a short circuit, be sure to replace the specific fuse or relay that overheated with a new one.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no specific recalls or TSBs for the engine fuse box on the 2007 Galant, there is one major safety recall for the vehicle you should be aware of:

• NHTSA Recall #08V454000: This recall addresses a fuel tank mounting strap bracket that may have been improperly formed. In a severe collision, the bracket could break, allowing the fuel tank to drop and potentially cause a fuel leak, increasing the risk of a fire. Contact a Mitsubishi dealer with your VIN to see if this recall applies to your vehicle and has been completed.

Owners have also reported issues with corroding automatic transmission oil cooler pipes, which was subject to a recall on some models. Water leaks from clogged sunroof drains or bad windshield seals have also been known to cause electrical issues by dripping on interior fuse boxes and modules.

Cost of a 2007 Mitsubishi Galant Engine Fuse Box

Frequently Asked Questions (FAQ)