The 2016 i3 is BMW's carbon-fiber electric city car with optional range extender. While the electric drivetrain is relatively bulletproof, these cars suffer from known issues with the range extender motor, drivetrain mounts, KLE (charging module) failures, and 12V battery gremlins that strand owners unexpectedly.
Range Extender (REx) Engine Carbon Buildup & Failure
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: range extender won't start or runs rough, Check Engine light with misfire codes, reduced REx power output, fuel smell in cabin when REx operates
Fix: The 647cc two-cylinder REx motor runs infrequently and accumulates carbon on valves and pistons. Severe cases require engine removal and rebuild (8-12 hours labor). Preventive: run REx monthly for 20+ minutes at highway speed. Extended warranty claims common but often denied after 50k. Some shops do walnut blasting intake valves without full removal (4-6 hours).
Estimated cost: $3,500-7,500
KLE (Onboard Charger) Failure
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: won't charge on Level 2 AC (DC fast charging still works), drivetrain malfunction warning, charge port light flashes yellow/red, no response when plugged in
Fix: The KLE (Kombilader Einheit) converts AC to DC for battery charging. Failure is total—car won't charge at home. Part is under the frunk, requires bumper removal and refrigerant recovery if A/C lines interfere. 4-6 hours labor. BMW extended some warranties to 8yr/100k for this specific part due to high failure rate. Used units available but risky.
Estimated cost: $2,800-4,500
Drivetrain Mount Failures
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: clunk when accelerating or decelerating, vibration through floor at low speeds, loud bang shifting from Drive to Reverse, visible rubber separation on motor mounts
Fix: The electric motor mounts fail from torque loads—instant electric torque is hard on rubber mounts. Front and rear motor mounts typically go first. Rear requires subframe drop (6-8 hours). Front is easier (2-3 hours). Most shops replace both sides while in there. Polyurethane aftermarket options last longer but add NVH.
Estimated cost: $1,200-2,800
12V Battery Failures Causing Total Shutdown
Common · high severity
Symptoms: car completely dead, won't unlock or start, drivetrain malfunction warning, random error messages about charging system, car won't go into Ready mode even with full HV battery
Fix: The i3 uses a small 12V AGM battery in the frunk to run computers and contactors—if it dies, the entire car is bricked even with 100% main battery. BMW's OE battery is undersized and fails every 3-4 years (worse in hot climates). Replacement is simple (0.5 hours) but requires registration/coding with proper scan tool or car throws faults. Preventive replacement at 3 years saves tows.
Estimated cost: $350-600
EME (Electric Motor Electronics) Inverter Overheating
Occasional · high severity
Typical onset: 70,000-120,000 mi
Symptoms: reduced power warning during acceleration, drivetrain malfunction light, car enters limp mode in hot weather or after sustained highway driving, error codes for inverter temperature
Fix: The inverter (EME unit) can overheat due to internal capacitor degradation or coolant flow issues in the electric drive cooling loop. Sometimes it's just low coolant or air in system (1 hour bleed procedure). Full inverter replacement requires motor removal (10-14 hours). BMW issued software updates to derate power proactively when temps climb. Check coolant level in electric system reservoir first—separate from REx coolant.
Estimated cost: $4,500-8,000
High-Voltage Battery Degradation & Cell Imbalance
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: significantly reduced range (below 60 miles on 22 kWh pack), battery conditioning takes longer, kapa max (state of health) below 70% on scan tool, uneven cell voltages visible in diagnostics
Fix: The 2016 has the smaller 22 kWh Samsung SDI pack (60 Ah cells). Capacity loss is expected but some packs degrade faster due to repeated DC fast charging or hot climate exposure. BMW warranty covered 8yr/100k for 70% capacity but most 2016s are out of warranty now. Individual module replacement is possible (16 hours labor, $2k-4k per module) but often not economical vs. used pack swap. BimmerCode can show real kapa max percentage.
Estimated cost: $8,000-15,000
Owner tips
Replace the 12V battery every 3 years proactively—it's the #1 cause of unexpected no-starts and the cheapest insurance you can buy.
If you have a REx model, run the range extender monthly for 20+ minutes at 55+ mph to prevent carbon buildup—short city cycles kill these motors.
Check both coolant systems (REx and electric drive) separately—low coolant in the electric side causes inverter overheating and expensive failures.
Use a quality OBD tool (Bimmercode or BimmerLink) to monitor HV battery state of health (kapa max) before buying used—anything below 75% means expensive battery work is coming.
Avoid repeated DC fast charging if possible—it accelerates HV battery degradation on these early Samsung cells; Level 2 home charging is much gentler.
A fascinating city EV with genuine BMW driving dynamics, but the 2016 is firmly used-car territory now—budget $2-3k/year for 12V batteries, KLE failures, and REx engine issues if you get the range extender model; BEV-only i3s are more reliable but range-limited.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Auxiliary 12V battery; located in front luggage compartment; AGM required for start-stop system and high-voltage traction battery support
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Every control module on the 2014-2017 BMW i3 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Optional equipment; basic coding for activation
Park Distance Control (PDC)0.5 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Rear bumper area, behind trim panel
🔧 BMW ISTA/D or Autel
⚠️ Sensor calibration may be needed
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
BMW of North America, LLC (BMW) is recalling certain 2014-2018 BMW i3 electric and hybrid electric vehicles. Unbelted, small adult, drivers may be at a higher risk of neck injury in the event of a frontal crash. These vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
Consequence: During a frontal impact, unbelted, small adult, drivers could be at a higher risk of neck injury.
Remedy: BMW will notify owners, and dealers will update the Driver air bag control unit software, free of charge. The recall is expected to begin January 8, 2018. Owners may contact BMW customer service at the dedicated i3 recall number 1-855-269-3361.
FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS · 17V088000
2017-02-09
BMW of North America, LLC (BMW) is recalling certain 2014-2017 i3 REx hybrid electric vehicles. The fuel tank vent line may rub against the ribbed wire protection sleeve of the battery positive (B+) cable, creating a hole in the vent line and causing a fuel vapor leak.
Consequence: A fuel vapor leak in the presence of an ignition source can increase the risk of a fire.
Remedy: BMW will notify owners, and dealers will inspect the fuel vent line, replacing it as necessary, and install a clip to prevent it from chafing, free of charge. The recall beganApril 3, 2017. Owners may contact BMW customer service at 1-800-525-7417.
Wiper blades
Hatchback with rear wiper. BMW push-button attachment style.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2016 BMW i3 22 kWh Single Motor RWD and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.