Audi Q5 & SQ5 Fuse Box Guide (2013-2025): Water Damage, Locations & Part Numbers
This guide explains the critical differences between fuse boxes in 2013-2017 and 2018-2025 Audi Q5, SQ5, and Q5 Sportback models, focusing on common water damage issues and replacement.
- There is a critical generation split: 2013-2017 (B8.5) and 2018-2025 (B9) models use different fuse boxes. Verify your vehicle's generation and part number before buying.
- Water damage is the primary cause of failure for fuse boxes in both generations, but in different locations: the engine bay for 2013-2017 models and the rear luggage area for 2018-2025 models.
- Replacement fuse boxes generally do NOT require programming, making a used OEM part a viable and cost-effective option.
- Preventative maintenance is key. Regularly cleaning plenum drains (B8.5) and checking for moisture in the trunk (B9) can prevent catastrophic and expensive electrical failures.
Generation Warning: Not All Fuse Boxes Are The Same
Warning: The 2013-2025 year range covers two distinct generations of the Audi Q5 platform, and they use different fuse boxes. It is critical to identify your vehicle's generation before purchasing a replacement part.
- First Generation (B8.5 Platform): Fits 2013-2017 Audi Q5 and 2014-2017 Audi SQ5. The key part number for the engine bay fuse box is 8K0937501. A 2017 model year Q5 or SQ5 is a B8.5 if the 7th and 8th digits of the VIN are 'FP'.
- Second Generation (B9/B9.5 Platform): Fits 2018-2025 Audi Q5, 2018-2024 Audi SQ5, and 2021-2024 Audi Q5 Sportback. Common part numbers include 80A941823, 80A941823A, and 80A971845A. These vehicles feature multiple fuse/junction boxes, including a key one on the battery's positive terminal.
This guide will cover the most common issues and replacement details for the primary fuse boxes in both generations.
Part 1: 2013-2017 (B8.5) Q5 & SQ5 Engine Bay Fuse Box
Known Issues: Catastrophic Water Damage
The single greatest threat to the B8.5 generation's engine bay fuse box (part number 8K0937501) is water intrusion. This fuse box is located in the plenum chamber at the base of the windshield on the driver's side. This area has drains to channel rainwater away, but they frequently become clogged with leaves, pine needles, and other debris. When the drains are blocked, the plenum fills with water, submerging the fuse box and often the nearby Engine Control Unit (ECU). This leads to widespread corrosion, short circuits, and complete failure of the module.
Pro Tip: The most effective way to prevent failure of this fuse box is to regularly clean the plenum chamber drains. This simple maintenance task involves removing the plastic cowl cover and clearing any debris to ensure water can drain freely.
🎬 Watch: How to clean the plenum chamber drainsSymptoms of Failure
- Widespread and seemingly unrelated electrical problems (e.g., lights, wipers, and windows malfunctioning).
- Vehicle will not start or cranks but fails to turn over.
- Warning lights flashing on the dashboard.
- A specific OBD-II fault code, 00926 - Terminal 30 Open Circuit, is a strong indicator of a failed fuse box.
Part 2: 2018-2025 (B9) Q5, SQ5 & Q5 Sportback Fuse Boxes
Known Issues: Rear Compartment Water Damage
For the second-generation models, a major electrical vulnerability has shifted to the rear of the vehicle. Numerous owners report water leaking into the luggage compartment, typically on the left side where a fuse box and critical control modules are located. Sources of the leak are often attributed to clogged sunroof drains or issues with body panel sealing. The water pools in the electronics well, submerging modules and causing massive electrical failure.
Symptoms of Failure
- Multiple warning lights appearing on the dashboard simultaneously.
- Malfunctions with systems controlled by rear modules, such as the power liftgate, rear lights, and parking sensors.
- The vehicle entering a 'bricked' state where it will not start and displays erratic behavior like lights flashing or windows opening on their own.
- Discovery of standing water in the left-side trunk compartment or spare tire well. 🎬 Watch: How to drain water from your Q5 trunk
Warning: Damage from this water leak can be extensive and extremely expensive to repair, with some dealer quotes reaching over $10,000 to replace modules and wiring harnesses. Some owners have installed water leak detectors in this area as a preventative measure.
Buying a Used Fuse Box
A used OEM fuse box can be a cost-effective solution, especially since these parts often do not require programming. However, careful inspection is crucial.
- Verify the Part Number: This is the most important step. Match the part number from your original fuse box exactly. For B8.5 models, check for 8K0937501. For B9 models, look for numbers like 80A941823A or 80A971845A. Do not rely on visual similarity alone.
- Inspect for Corrosion: Closely examine all metal pins, terminals, and fuse slots for any signs of green or white corrosion. This is a tell-tale sign of water damage, and the part should be rejected immediately.
- Check for Physical Damage: Look for cracked plastic housings, broken connector tabs, or any signs of melting or heat damage around the fuse terminals.
- Source Vehicle Information: If possible, choose a part from a vehicle with lower mileage and no reported flood damage. Since failure is often due to external factors (clogged drains), the part itself is generally reliable if kept dry.
- Why Used OEM is a Good Choice: For this component, a dry, corrosion-free used OEM part is often superior to a new aftermarket one. The OEM part is built to Audi's exact specifications for materials and fitment. Since programming is not typically required, it's a straightforward swap.
Cost Breakdown
| Part/Service | Estimated Cost |
|---|---|
| New OEM Fuse Box (e.g., 80A941823) | $330 - $470 |
| New OEM Fuse Holder (e.g., 8K0937501) | $10 - $15 (Note: This is often just the holder, not a full assembly) |
| Used OEM Fuse Box (eBay, Salvage) | $20 - $175 |
| Shop Labor for Replacement | $150 - $300 |
Note: Costs are estimates and can vary based on location, vehicle condition, and the specific fuse box being replaced. Water damage repairs involving multiple modules and wiring can be significantly more expensive.
Frequently Asked Questions
Does a replacement fuse box need to be programmed?
Generally, no. For both the B8.5 and B9 platforms, the main fuse and relay boxes are typically non-intelligent power distribution units that do not require programming or coding. They are considered a direct swap. However, if the fuse box is integrated with a control module (like the Body Control Module or Comfort Control Module), that module may require programming or 'Component Protection' removal by a dealer or specialist.
Where are the fuse boxes located on my Q5?
Audi Q5 models have multiple fuse box locations. Common spots include: the driver's side of the dashboard (behind a cover), the passenger's side footwell, the engine compartment (often on the driver's side under the windshield cowl), and in the luggage compartment (typically on the left or right side behind a panel). Always consult your owner's manual or a reliable diagram for your specific model year.
🎬 See this 2009-2017 Audi Q5 fuse box location guideWhat are the OBD-II codes for a bad fuse box?
A failing fuse box may not always generate a specific code for the box itself. Instead, you may see multiple communication errors or 'open circuit' codes for the components it powers. For the B8.5 models, a common and specific code is 00926 - Terminal 30 Open Circuit, which points directly to an issue with the main power supply from the fuse box. For B9 models, you might see a cascade of faults in the Central Electrics (09) module.
Can I replace just one blown fuse instead of the whole box?
Yes, absolutely. The purpose of a fuse is to be a cheap, replaceable part that protects more expensive components. If a single component stops working, you should always check its corresponding fuse first. The entire fuse box only needs replacement if the box itself is physically damaged, melted, or corroded from water intrusion.
Helpful Videos
Technical Specifications
OEM Part Numbers: 8K0937501 80A941823 80A941823A 80A971845A
Vehicle has multiple fuse boxes located in the engine bay, interior cabin (driver and passenger side), and luggage compartment.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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- Audi SQ5:
- Audi Q5 Sportback:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Generation Warning: Not All Fuse Boxes Are The Same
- Part 1: 2013-2017 (B8.5) Q5 & SQ5 Engine Bay Fuse Box
- Known Issues: Catastrophic Water Damage
- Symptoms of Failure
- Part 2: 2018-2025 (B9) Q5, SQ5 & Q5 Sportback Fuse Boxes
- Known Issues: Rear Compartment Water Damage
- Symptoms of Failure
- Buying a Used Fuse Box
- Cost Breakdown
- Frequently Asked Questions
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