Electronics & sensors

Electrical and sensor faults on a used car · what to check

Electrical faults are the modern equivalent of rust: hard to price, easy to hide, and increasingly the most expensive thing on a ten-year-old car.

Quick answer

Electronics & sensors appears as a documented fault on 299 models in our library, across 427 separate faults. The most common areas involved are Electrical, Infotainment, Interior, Bodywork, Engine, Brakes.

What it usually means

  • Blank or rebooting screen · head unit or software, often dealer-only.
  • Multiple unrelated faults at once · earth, loom or battery health rather than four failures.
  • Windows, mirrors or central locking failing on one side · door loom wear.
  • Intermittent faults that clear on restart · module or connector, and hardest to prove later.

How to check it on the forecourt

  1. 01Sit in the car and operate every switch, window, mirror, lock and seat motor.
  2. 02Cycle the infotainment, reversing camera, Bluetooth pairing and climate controls.
  3. 03Open and close each door fully while watching for flicker on the dash.
  4. 04Read stored codes across modules, not just the engine.

Models where this is documented

Each entry links to that model's full fault page, with onset mileage, severity and what to inspect.

Volvo S902016–20254 matching faults
  • Sensus infotainment freezes and slow system boot-up· Age-related
  • Adaptive cruise control and pilot assist sensor faults· Age-related
  • Driver's seat memory module and heating element failures· Age-related
Alfa Romeo Stelvio2017–20253 matching faults
  • Infotainment freezes and software glitches affecting climate and connectivity· Age-related
  • Parking sensor and camera module failures· Age-related
  • Water ingress into the front footwells causing damp carpets and potential Body Control Module (BCM) failure.· 4-6 years
Audi A52016–20243 matching faults
  • MMI infotainment and camera faults· Age-related
  • Coolant leak from the thermostat housing and water pump module on 2.0 TFSI (EA888) engines.· 40,000-70,000 miles
  • Daytime Running Light (DRL) LED modules burning out, causing the light guide to turn yellow or fail completely.· 50,000-80,000 miles
Audi A82010–20173 matching faults
  • MMI infotainment and multiple control unit faults· Age-related
  • Doors fail to lock or unlock when touching the exterior handles due to failed Advanced Key capacitive sensors.· 50,000-80,000 miles
  • Siren-like whining on acceleration or EPC light illumination due to turbocharger starvation from a blocked oil strainer screen on 4.0 TFSI models.· 60,000-90,000 miles
Audi Q4 e-tron2021–20253 matching faults
  • MMI infotainment freezes and slow system responses· Age-related
  • Failure to produce hot or cold air due to faulty pressure sensors or valve blocks, specifically on models equipped with the optional heat pump.· 20,000-40,000 miles
  • Electric tailgate struts groan during operation, or the hands-free kick sensor fails entirely due to water ingress in the rear bumper module.· 30,000-50,000 miles
BMW 7 Series2015–20223 matching faults
  • Comfort access, gesture control and display glitches· Age-related
  • Daytime running light (DRL) halo rings turn yellow or fail completely due to burnt LED modules and light tubes.· 4-6 years
  • Vehicle refuses to charge from a wallbox or displays a drivetrain malfunction warning due to a failed KLE (Convenience Charging Electronics) module.· 50,000-80,000 miles
Cupra Born2021–20263 matching faults
  • Infotainment and software bugs, failed over-the-air updates· Age-related
  • Water ingress causes the wing mirror puddle lights to project a blurred, distorted Cupra logo, or fail entirely.· 10,000-20,000 miles
  • Capacitive haptic touch buttons on the steering wheel become unresponsive or register phantom inputs while driving.· 20,000-40,000 miles
Jeep Gladiator2020–20233 matching faults
  • Infotainment (Uconnect) glitches.· Age-related
  • Flashing axle lock warning light on the instrument cluster due to potting compound failure on the rear locker sensor (Rubicon models).· 30,000-60,000 miles
  • Engine Stop/Start (ESS) system failure or complete non-start caused by a degraded auxiliary battery draining the main battery.· 3-5 years
Kia Carnival2022–20243 matching faults
  • Infotainment/dual-screen glitches and camera faults.· Any
  • Power sliding-door sensor and motor faults.· Any
  • Short circuit in the accessory tow hitch wiring module due to moisture ingress, potentially causing a continuous battery drain or fire risk.· Any mileage (weather dependent)
Kia EV62021–20253 matching faults
  • Infotainment freezes and software update requirements· Age-related
  • Motorised charging port door refuses to open or fails to latch shut smoothly.· 20,000-40,000 miles
  • Complete loss of audio output from the Meridian sound system, including parking sensor chimes and indicator ticks, due to amplifier failure.· 15,000-40,000 miles
Kia Telluride2020–20233 matching faults
  • Trailer wiring / tow harness fire recall.· Any
  • Infotainment and seat-memory glitches.· Age-related
  • Windscreen glass is highly susceptible to rapid cracking from minor stone chips.· Any mileage
Mercedes-Benz C-Class2015–20213 matching faults
  • COMAND infotainment glitches and freezes.· Any
  • Engine management light (EML) illuminated alongside an AdBlue system malfunction warning or countdown timer on the instrument cluster, typically due to failed NOx sensors on diesel models.· 40,000-70,000 miles
  • The centre console touchpad stops responding to swipe gestures or physical clicks, and the gloss plastic surface often develops hairline cracks.· 40,000-80,000 miles
Mercedes-Benz C-Class Estate2014–20213 matching faults
  • COMAND screen and camera faults· Age-related
  • The rotary COMAND controller wheel spins freely without scrolling through the menus on the screen, caused by a snapped internal plastic shaft.· 3-5 years or 50,000 miles
  • The Easy-Pack power tailgate groans, shudders, or fails to open or close fully due to failing spindle drive struts or water ingress in the control module.· 50,000-70,000 miles
Mercedes-Benz GLE2019–20253 matching faults
  • Driver assistance sensor and camera faults· Age-related
  • MBUX central display freezing, going completely blank, or getting stuck in a continuous reboot loop due to hardware or software faults.· 20,000-60,000 miles
  • Water ingress into the cabin due to blocked panoramic sunroof drains or poorly sealed windscreens, leading to electrical gremlins.· 4-5 years
Mercedes-Benz S-Class2013–20203 matching faults
  • COMAND infotainment and control unit software faults· Age-related
  • NOx sensor failure triggering the engine management light and an AdBlue countdown.· 50,000-80,000 miles
  • Water ingress in LED Intelligent Light System units causing control module failure.· 4-7 years
Mercedes-Benz V-Class2014–20253 matching faults
  • Sliding door motor and sensor failures on power-operated doors· 60,000+ miles
  • Comand infotainment and reversing camera glitches· Age-related
  • AdBlue countdown warning on the dash, typically caused by failed NOx sensors or a faulty AdBlue tank heater element.· 40,000-80,000 miles
Peugeot 30082016–20253 matching faults
  • 1.5 BlueHDi AdBlue and DPF/NOx sensor faults· 60,000+ miles
  • i-Cockpit screen failures and reboot loops· Age-related
  • Keyless entry capacitive door handle sensors failing due to water ingress.· 4-6 years
Skoda Superb2015–20243 matching faults
  • Screen digitizer failure causing 'ghost touches', erratic menu changes, or dead zones on the display.· 4-7 years
  • Loss of four-wheel drive on 4x4 models due to a blocked Haldex pump gauze causing pump failure.· 30,000-60,000 miles
  • Electric power tailgate fails to open fully, drops unexpectedly, or groans loudly due to strut failure or loom chafing.· 50,000-80,000 miles
Tesla Model 32018–20233 matching faults
  • MCU/touchscreen glitches and 12V battery failures.· Any
  • Reverse camera feed blacking out or flickering due to a damaged coaxial cable in the boot hinge.· 30,000-50,000 miles
  • Charge cable fails to lock into place or gets permanently stuck in the socket due to a failed locking deadbolt.· 40,000-60,000 miles
Toyota C-HR2018–20223 matching faults
  • Infotainment/Entune freezing or Bluetooth dropouts.· Any
  • Multi-information display shows 'Maintenance required for traction battery cooling parts' due to a blocked cooling fan filter.· 40,000-60,000 miles
  • Hairline stress fractures developing on the windscreen, typically radiating downwards from the top centre near the forward-facing ADAS camera housing.· 15,000-40,000 miles
Alfa Romeo Giulietta2010–20202 matching faults
  • Dashboard warning lights and instrument cluster faults from wiring corrosion· Age-related
  • Broken wires in the tailgate hinge bellows cause the boot release, rear wiper, or rear lights to fail.· 6-8 years
Audi A12012–20252 matching faults
  • Infotainment, sensor and central locking niggles· Age-related
  • Slow coolant loss and a sweet smell from the engine bay due to a leaking thermostat housing and water pump module on EA211 petrol engines.· 40,000-70,000 miles
Audi Q22016–20252 matching faults
  • Virtual Cockpit and infotainment faults· Age-related
  • Slow loss of coolant and a sweet smell from the engine bay, caused by a leaking thermostat housing/water pump module on TFSI engines.· 50,000-70,000 miles
Audi Q52013–20172 matching faults
  • Water pump / thermostat module failure.· 80,000+ miles
  • Front LED Daytime Running Lights (DRLs) dimming, turning yellow, or failing completely due to the control module overheating and burning the light tube.· 60,000+ miles or 6-8 years
Audi Q72015–20242 matching faults
  • MMI, camera and driver assistance faults· Age-related
  • Blocked panoramic sunroof drains causing water ingress, leading to damp carpets and potential module damage.· 4-6 years
BMW 1 Series2011–20242 matching faults
  • iDrive faults, parking sensors and window regulators· Age-related
  • Dashboard bulb failure warnings and dim or flickering rear lights· 4-7 years
BMW 3 Series2012–20182 matching faults
  • Dashboard warnings for blown rear bulbs, fast-flashing indicators, or dim rear lights caused by a melted earth pin in the taillight wiring connector.· 50,000-80,000 miles
  • Sudden loss of power, loud popping noise under boost, and a 'Drivetrain Malfunction' warning due to the factory plastic charge pipe splitting.· 50,000-80,000 miles
Buick Enclave2018–20242 matching faults
  • Infotainment reboots and camera faults.· Any
  • Electronic parking-brake and ABS module faults.· Any
Cadillac XT52017–20232 matching faults
  • CUE infotainment lag and camera faults.· Any
  • Rear differential twin-clutch module binding, causing groaning noises or judder during tight turns.· 50,000-80,000 miles
Chevrolet Blazer2019–20242 matching faults
  • Infotainment reboots and Stop/Start faults.· Any
  • Electronic parking brake and ABS sensor faults.· Any
Chevrolet Trailblazer2021–20242 matching faults
  • Infotainment and camera glitches.· Any
  • Intermittent stiff brake pedal on start-up or electronic brake assist warning lights, linked to a failing brake vacuum sensor.· 20,000-45,000 miles
Citroen C32016–20252 matching faults
  • BSI faults, battery drain and screen failure· Age-related
  • Cabin heater blower fan fails to operate on lower speeds or stops working entirely due to resistor failure.· 4-7 years
Cupra Formentor2020–20262 matching faults
  • MIB3 infotainment freezing, black screens and slow wake-up· Age-related
  • Constant 'Travel Assist currently unavailable' warning chimes caused by a faulty capacitive sensor in the steering wheel rim.· 15,000-40,000 miles
Cupra Leon2020–20262 matching faults
  • Touch slider and infotainment glitches, unresponsive climate controls· Age-related
  • Emergency SOS call system malfunction warning on the dash and a red LED on the roof console.· 30,000-50,000 miles
Dacia Logan MCV2013–20222 matching faults
  • Basic infotainment and central locking faults· Age-related
  • Horn fails to operate or headlights flicker and cut out due to broken internal wiring within the left-hand steering column stalk.· 40,000-80,000 miles
Dodge Charger2011–20192 matching faults
  • TIPM (power module) faults causing no-starts and accessory issues.· 60,000+ miles
  • Touchscreen delamination causing phantom inputs or bubbling under the glass.· 40,000-60,000 miles or 3-5 years
Dodge Durango2011–20232 matching faults
  • TIPM (integrated power module) faults causing random electrical issues.· Age-related
  • The 8.4-inch Uconnect touchscreen registers phantom inputs or displays visible bubbling and delamination behind the glass.· 4-7 years
Fiat Ducato2014–20252 matching faults
  • Alternator failure and electrical shorts caused by rainwater bypassing the windscreen scuttle panel and pouring onto the engine.· 3-5 years or 40,000+ miles
  • Instrument cluster failure, characterised by dimly glowing warning lights when the ignition is off or total failure of the central LCD screen.· 40,000-80,000 miles
Fiat Tipo2016–20242 matching faults
  • Uconnect touchscreen freezing or slow to respond· Age-related
  • Electric power steering (EPS) motor or torque sensor failure, often exacerbated by frequent use of the 'City' mode function.· 60,000 miles or 5-7 years
Ford Edge2015–20232 matching faults
  • 'Adaptive Steering Fault' warning message on the instrument cluster, accompanied by an off-centre steering wheel or unexpectedly heavy steering at low speeds due to a failed steering wheel module.· 50,000-80,000 miles
  • SYNC 3 screen goes completely black, freezes, or repeatedly reboots. Bluetooth and navigation functions become unresponsive due to APIM (Accessory Protocol Interface Module) failure.· 3-6 years

Showing the 40 models with the most documented matches · browse the full library.

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