2014-2020 Chevrolet Impala Engine Fuse Box: Solving Electrical Faults & Part Number Puzzles

A Critical First Step: Is Your 2014 an Impala or an Impala Limited?

For the 2014 model year, Chevrolet sold two different versions of the Impala. This guide applies only to the redesigned 10th generation model, often called the 'New Style'. The easiest way to confirm you have the correct model is to check the 4th digit of your Vehicle Identification Number (VIN). If the 4th digit is a '1', you have the 10th generation Impala this article covers. If it is a '2', you have the 'Impala Limited', which is a continuation of the older 9th generation body style and uses different parts. Always verify your model before purchasing parts.

Symptoms of a Failing 2014-2020 Impala Fuse Box

Fuse box failure can be difficult to diagnose because it often causes symptoms in other unrelated systems. If you experience several of the following issues at once, the fuse box itself may be the root cause.

• Multiple Unrelated Electrical Failures: This is the most common sign. For example, the radio, power windows, and fuel pump may stop working simultaneously.
• No-Start or Intermittent Start: The fuse box controls power to the starter relay and fuel pump. A fault within the box can prevent the engine from cranking or starting.
🎬 See how to find and replace the starter fuse
• Flickering Lights or Gauges: Intermittent power connections inside the fuse box can cause dashboard lights, headlights, or interior lights to flicker.
• Visible Corrosion or Damage: A physical inspection may reveal white, green, or blue powder-like corrosion on the terminals, which indicates water intrusion.
• Melting Plastic or Burning Smells: A strong burning odor or melted plastic around a specific fuse or relay socket points to a severe short circuit and excessive heat, which can damage the box internally.
• Frequently Blowing Fuses: If a specific fuse blows repeatedly even after replacing the component it protects, the fault may lie within the fuse terminal or internal circuitry of the box itself.

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

While there are no widespread recalls for the fuse box itself, several related electrical issues on the 2014-2020 Impala are important to know about during diagnosis.

• NHTSA Recall 14V450: Some 2014 Impala models were recalled for a poor electrical ground connection to the Power Steering Control Module (PSCM). This could cause a sudden loss of power steering. Before suspecting the fuse box, ensure this recall repair, which involves cleaning the ground connection, has been performed.
• NHTSA Recall 13V220: A recall was issued for the 2013-2014 Impala requiring the Body Control Module (BCM) to be reprogrammed to fix an issue with brake light function. This highlights the importance of software and programming in the vehicle's electrical system.
• Water Intrusion: Though not subject to a specific recall, underhood fuse boxes are susceptible to water damage if the cover is not sealed correctly. This can lead to corrosion and unpredictable electrical problems.

Buying a Used Fuse Box: What to Look For

A used OEM fuse box can be a cost-effective and reliable alternative to an expensive new unit, provided you choose carefully. Cheap aftermarket copies often have lower quality internal components that can fail prematurely or cause new, hard-to-diagnose issues.

1. Match the Part Number EXACTLY: This is the most important rule. Due to variations in engines and model years, several different fuse boxes were used. Do not rely on visual appearance alone. The part number is printed on a sticker 🎬 Watch: A complete guide to fuse box locations and diagrams on the side of the fuse box. You must match this number to your original part to ensure compatibility.
2. Physical Inspection: Carefully inspect the used unit. Look for any signs of white or green corrosion on the pins or connectors. Check for any melted plastic around the fuse or relay sockets. Ensure the outer casing is not cracked or damaged, which could compromise its seal.
3. Check the Connector Pins: Look at the large connectors on the bottom or sides. All pins should be straight, clean, and free of corrosion. A single bent or corroded pin can prevent the unit from working.
4. Source Vehicle History: If possible, avoid parts from flood-damaged vehicles. A fuse box from a vehicle with collision damage is generally a safer bet than one from a car that was submerged in water.

Decoding Part Numbers

Compatibility is complex. Always use the number on your original part as the final word. The information below is a general guide based on manufacturer catalogs.

Programming and Installation Requirements

Modern fuse boxes contain microprocessors and communicate with other modules in the car. After installing a replacement unit (even a used OEM one), it must be configured using special software. Without proper programming, you may experience a range of issues, including:

• The vehicle may not start.
• Features like power windows, radio, or climate control may not work.
• Warning lights, such as the airbag or check engine light, may illuminate.

This programming requires a dealer or an independent repair shop that has a subscription to GM's Technical Information System (TIS) or ACDelco TDS and a compatible J2534 pass-thru device or high-end scan tool. While a DIYer can perform the physical swap to save on labor costs, the vehicle will likely need to be taken to a shop for the final programming step.

Cost to Replace a 2014-2020 Impala Fuse Box

Frequently Asked Questions (FAQ)