• BMW 4-Series F32 F33 F36 Instrument Cluster KOMBI Speedometer Dashboard Repair Service 804086 Driver 15KLWUP Short circuit to positive
  • BMW Instrument Cluster KOMBI Speedometer Dashboard Repair Service F30 F31 F32 F33 F34 F36 804086 Driver 15KLWUP Short circuit to positive
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BMW 3 & 4 Series F30 F31 F34 F35 Instrument Cluster KOMBI Speedometer Dashboard Repair Service 804086 Driver 15KLWUP Short circuit to positive

BMW 3 & 4 Series F30 F31 F34 F35 Instrument Cluster KOMBI Speedometer Dashboard Repair Service 804086 Driver 15KLWUP Short circuit to positive

$399.00 USD
$399.00 USD
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ECU MAVERICK - Instrument Cluster Repair Specialists

BMW 3 & 4 Series Instrument Cluster Repair

F30 • F31 • F34 • F35 KOMBI Speedometer Dashboard Service

CODE 804086 SPECIALIST REPAIR

Driver 15KLWUP Short Circuit to Positive

🔧 Professional Repair Service ⚡ Fast Turnaround ✅ 6-Month Warranty 🎯 Quality Guaranteed

BMW Kombi/Instrument Cluster Repair Service

The fault code 804086 indicates a critical electrical failure in BMW F-series vehicles that prevents the instrument cluster from entering sleep mode, causing severe battery drain overnight. This "Driver 15KLWUP short circuit to positive" fault typically drains batteries within 8-12 hours due to a continuous 10-14 amp draw when the vehicle should be consuming less than 50 milliamps at rest.

Understanding the 15KLWUP Circuit

The 15KLWUP (Terminal 15 Wake-Up) circuit serves as a crucial wake-up signal for control modules that cannot be activated through CAN bus communication alone. This fault primarily affects 2012-2019 BMW F-series models including the F30/F31 3-Series, F32/F33 4-Series, and F20/F22 1/2-Series, with the instrument cluster (KOMBI) being the primary failing component.

🔴 Diagnostic Test #1: Voltage Check

Monitor Terminal 15 wake-up voltage with ISTA while vehicle should be in sleep mode.

✓ Normal: 0 volts
✗ Faulty: 12+ volts continuously

🔴 Diagnostic Test #2: Current Draw

Parasitic drain test with multimeter in series with battery negative cable.

✓ Normal: <50 milliamps
✗ Faulty: 2-14 amps

✅ Definitive Cluster Confirmation Test

To confirm the cluster as the source, disconnect the cluster's electrical connectors while monitoring - the 15WUP voltage should immediately drop to 0 volts, confirming the short circuit originates within the cluster itself. The telltale sign: unplugging the instrument cluster causes an immediate 10-12 amp drop in current draw.

Common Symptoms We Fix

🔋 Battery Drain Issue: Cluster will not go to "sleep" when vehicle is switched off, causing battery drain overnight
⚠️ DTC 804086 Hard Code: Driver 15KLWUP short circuit to positive stored in memory
🔌 Error Code 804086: Driver KL15WUP: short circuit to B+ detected
📉 Battery Warning: Increased battery drain message displayed (battery drains overnight)
✨ Expert Solution for Code 804086

This fault is a common issue in BMW F30/F31/F34/F35 instrument clusters. Our specialized repair service fixes the root cause of the KL15WUP short circuit, preventing battery drain and eliminating the fault code permanently. Save your battery and avoid expensive cluster replacement!

Compatible BMW Models

F30 3 Series Sedan
F31 3 Series Touring
F34 3 Series GT
F35 3 Series LWB

Model Years Covered

2012 - 2019

All 3 Series and 4 Series variants with digital instrument clusters

Compatible Part Numbers

62105A039F0
62105A03A00
62105A03A23
62105A03A26
62105A03A32
62105A03A39
62106804959
62106804961
62106804966
62106804969
62106805207
62106834490
62106834492
62106834497
62106834500
62106836896
62106843103
62106843127
62106843129
62106843134
62106843137
62106847230
62106847232
62106847237
62106847240
62106991687
62108718251
62108718267
62108718281
62108794234
62108803138
9232895
9379969

Understanding the 804086 Fault

Why Does This Happen?

The 804086 fault code indicates a short circuit in the KL15WUP (Wake-Up) circuit within the instrument cluster. This circuit is responsible for managing the cluster's sleep mode when the vehicle is turned off.

When this circuit fails, the cluster remains active even when the car is off, continuously drawing power and draining your battery overnight. This is a hardware issue that requires professional component-level repair.

🔍
Precise Diagnosis
We identify and repair the exact faulty component causing the KL15WUP short circuit.
🛠️
Component-Level Repair
Professional micro-soldering and component replacement to fix the root cause.
💰
Cost-Effective Solution
Save hundreds compared to dealer cluster replacement - we repair your original unit.

Simple Repair Process

1
Submit Request
Fill out our online form for FREE technician assessment
2
Get Approval
Receive approval email with your unique repair ID
3
Ship Cluster
Remove and ship your instrument cluster to us
4
Expert Repair
We fix the 804086 fault within 1-3 business days
5
Return & Install
Receive your repaired cluster and reinstall

Start Your FREE Assessment Today!

Our expert technicians will review your case at no cost and confirm if we can help

Submit Repair Request Form →

Why Choose ECU Maverick?

🏅 Our Professional Difference

We test BEFORE and AFTER repair to ensure the battery drain problem has been completely eliminated. Unlike other repair shops that randomly replace chips without proper diagnosis, we use advanced testing equipment to verify the fault is fixed.

✓ Proven Track Record

We've successfully repaired several dozen units with this exact fault - ZERO warranty returns!

✓ Quality Components

We use only OEM or superior quality parts - no cheap substitutes that fail again

🏆
Cluster Specialists
Expert technicians specializing in BMW instrument cluster repairs with years of experience.
🔬
Advanced Testing
Professional diagnostic equipment confirms battery drain elimination before shipping back.
⚡
Fast Service
1-3 business day turnaround to get you back on the road quickly.
🛡️
6-Month Warranty
Comprehensive warranty coverage - though you won't need it with our quality repairs!
💡
100% Success Rate
Several dozen repairs completed - zero warranty returns speaks to our expertise.
💸
Done Right First Time
Proper diagnosis and repair means no repeat failures - save time and money.
⚠️ Don't Ignore Battery Drain Issues!
The 804086 fault won't resolve on its own. Continuing to drive with this issue can lead to:
  • Complete battery failure requiring replacement
  • Being stranded with a dead battery
  • Potential damage to other electrical components
  • Increased wear on your alternator
Fix it now before it causes more expensive problems!

Stop Your Battery Drain Today!

Professional repair service for BMW F30/F31/F34/F35 instrument clusters with code 804086

Submit Repair Request Get FREE Assessment

Fix Your Cluster - Save Your Battery!

Don't let a faulty instrument cluster drain your battery every night
Professional repair with 6-month warranty

✓ Expert Repair ✓ 6-Month Warranty ✓ Fast Turnaround
Start Your Repair Today

ECU MAVERICK

Professional Automotive Electronics Repair

Specializing in BMW Instrument Clusters, TCMs, and Electronic Module Repairs

View full details

Getting Started

Submit Your Work Order

Fill out our simple work order form to get your unique work order number. We'll email you shipping instructions immediately. Ship your module to us using any carrier (USPS, FedEx, UPS). Include your work order number with your shipment.

What's Covered

Thorough Bench Testing

Every module is tested before and after repair to ensure full functionality. If your unit tests fine, shows no issues, or is deemed non-repairable, a bench fee applies. We'll contact you before charging anything beyond the base service fee.

What to Expect

Turnaround & Warranty

✓ Turnaround: 2-3 business days (complex jobs may take longer)

✓ Warranty: 6 months on repairs we perform

✓ Programming: Not required—plug and drive

About ECU Maverick — Expert ECU Repair & Programming Services

ECU Maverick specializes in component-level ECU repair and programming for European, domestic, and specialty vehicles. Based in Fort Myers, Florida, we serve independent repair shops, dealerships, and vehicle owners nationwide.

Where most shops rely on reprogram-and-replace methods, we take a different approach. Our technicians diagnose and repair individual circuits at the board level, restoring modules that others write off as failures. This expertise comes from years of reverse engineering and bench testing across thousands of control units.

Vehicles We Service

We specialize in European automotive electronics, including BMW, Mercedes-Benz, Audi, Porsche, Land Rover, Bentley, Ferrari, Lamborghini, Maserati, and Aston Martin ECU repair. We also service domestic vehicles, heavy equipment control modules, and marine electronics systems.

Why Shops and Owners Choose Us

Fast Turnaround — Most ECU repairs ship within 2–3 business days. Same-day rush service available.

Plug-and-Play Ready — Every module leaves fully programmed and coded to your vehicle. No dealer visit required.

Direct Communication — Text or call us and speak with a real technician. No ticket queues, no waiting.

6-Month Unlimited Mileage Warranty — Drive with confidence. Our warranty covers you regardless of how many miles you put on.

Our Commitment

We exist to keep your vehicle out of the dealership and back on the road—with reliable repairs, transparent pricing, and expert support from start to finish. Every job receives the same attention we'd give our own vehicle.