U1110: How to Diagnose & Fix — Network Communication Fault (manufacturer-specific; commonly Lost Vehicle Speed Message)
6 vehicles · 4 makes · $140-$2,000 repair
How to diagnose and fix U1110: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Kia K5 · 2021–2025
The K5 infotainment system — both the 8-inch and 10.25-inch displays — experiences random screen blackouts, freezes, and spontaneous reboots. The screen may go completely black while driving, losing access to navigation, backup camera, and climate controls. Some owners report the system rebooting in a loop. The issue is typically software-related but can also be caused by a failing display head unit. Android Auto and Apple CarPlay connections can trigger or worsen the problem.
Common Symptoms
- Infotainment screen goes completely black while driving
- System freezes and becomes unresponsive to touch
- Screen reboots with Kia logo repeatedly
- Backup camera unavailable when in reverse
- Bluetooth audio cutting out
- Climate controls unresponsive on touchscreen-only models
How to Fix
First try a system reset by holding the power/volume knob for 10+ seconds. Visit a Kia dealer for the latest infotainment software update — Kia has released multiple updates addressing stability issues (check for updates via the Kia Connect app or USB update). If the software update does not resolve the issue, the head unit may need replacement under warranty ($800-$2,000 if out of warranty). Disconnect the phone and disable wireless CarPlay/Android Auto to test if the issue is phone-related. A factory reset of the infotainment (Settings > General > Reset) can also help.
Owner tips & cautions
- TipBefore going to the dealer, try a USB software update. Download the latest navigation/infotainment update from the Kia owners portal, put it on a USB drive, and install it. Many blackout issues are fixed by the latest software.
- TipIf the screen goes black, hold the power knob for 10 seconds to force a reboot. This is faster than disconnecting the battery and usually restores the system immediately.
Sources for this issue (1)
Dodge Challenger · 2008–2023
A widely reported electrical complaint across nearly all Challenger model years is excessive parasitic battery drain that leaves the car dead overnight or after sitting a few days. A healthy modern vehicle should settle to roughly 25-50 mA of key-off draw once all modules go to sleep; owners reporting this problem measure anywhere from several hundred milliamps to over 2-4 amps, which is enough to flatten a battery in a day or two. There are several distinct, real-world root causes documented across owner forums (ChallengerTalk, ChallengerForumz, Hellcat.org), NHTSA/CarComplaints filings, and repair sites: 1) Smart-glass / one-touch power window self-cycling — the single most-reported cause in NHTSA and CarComplaints/CarProblemZoo data (18+ "battery dead" reports concentrated on 2010-2014, plus 2018). A faulty window switch or window module causes the driver- or passenger-side glass to drop and raise itself a fraction of an inch repeatedly with the key off, running the motor until the battery is dead. Chrysler issued a recall on 2011 cars for a related concern, but owners of 2012+ report the same symptom with no recall. 2) TIPM (Totally Integrated Power Module) faults — the under-hood power/fuse-relay computer controls dozens of circuits and can keep a circuit "awake" or stick a relay closed, producing a steady ~1-2 A draw. TIPM failure is a known weak point on Chrysler/Dodge platforms and a common diagnosis on early (2008-2014) cars. 3) Infotainment / Uconnect radio (RER, 730N, and later Uconnect head units) not entering sleep mode — a hung or buggy radio keeps the accessory bus awake. Owners report dealers pulling the radio fuse to confirm, then resolving it with a head-unit software re-flash (e.g., updating to 18.45.01) or radio replacement; multiple owners also report repeated radio/touchscreen failures on 2015-2017 cars. 4) Stuck switches and accessories — faulty door-jamb/courtesy switches that keep a dome light on, a trunk/glovebox/vanity light staying on, door-lock actuator faults, or aftermarket add-ons (alarms, amps, dash cams) wired to a constant-hot circuit. 5) Alternator diode failure — a shorted rectifier diode lets current bleed backward through the alternator with the engine off; some owners also have a charging fault where the PCM voltage regulation is at fault, so a new alternator alone does not fix it. 6) Hellcat / supercharged charge-air-cooler (intercooler) auxiliary coolant pump not shutting off — on 2015+ supercharged cars the aux pump can fail to power down (often after coolant intrudes into the connector or a loose intake-box ground), running the pump and killing the battery in as little as 3 days; this typically also sets charge-air-cooler pump DTCs (P023B, U02A9). SRT models from 2018+ include a "Storage Mode" that reduces key-off draw and should be enabled when parking.
Common Symptoms
- Battery dead the next morning or after the car sits a few days
- Car needs a jump-start frequently despite a relatively new battery
- Power window drops and raises itself a fraction of an inch with the key off / ignition off
- Audible relay clicking or a motor/pump running after the car is shut off and locked
- Key-off parasitic draw measures well above the normal ~25-50 mA (often hundreds of mA to 2-4 A)
- New battery still goes dead and alternator tests fine
- Infotainment/Uconnect radio or touchscreen freezing, restarting, or failing to power down
- Hellcat intercooler/charge-air pump stays warm and running after shutdown
- Battery/charging warning light or flickering dash lights
- Dome, trunk, or courtesy light staying on with doors closed
How to Fix
Confirm the charging system first: load-test the battery and verify alternator output with a multimeter, including an AC-ripple check to catch a failing diode (a new battery that keeps dying with a "good" charging test points to parasitic draw, not the battery). Then perform a key-off parasitic-draw test: let the car fully sleep (30-60 minutes, doors closed), put a meter in series with the negative battery cable, and confirm the draw. Anything sustained above ~50 mA is suspect; over ~250 mA will flatten the battery overnight. Isolate the offending circuit by pulling fuses/relays one at a time (both the under-hood and trunk-area fuse boxes) and watching for the draw to drop. Common findings and fixes: - Power-window self-cycling: replace the faulty window switch or window/door module and reset window auto-up programming; have the dealer check for any applicable recall/extended-warranty coverage. - Radio/Uconnect not sleeping: confirm by pulling the radio fuse; fix with a head-unit software re-flash/update or replace the head unit if it won't sleep. - TIPM keeping a circuit awake or a stuck relay: swap/replace the suspect relay or, if confirmed, the TIPM. - Stuck door/courtesy/trunk switch or stuck dome light: replace the faulty switch. - Alternator diode: replace the alternator (and verify PCM charging control if the fault persists). - Hellcat charge-air-cooler aux pump not shutting off (P023B / U02A9): inspect/clean the intake-box ground and the pump connector for coolant intrusion; replace the auxiliary coolant pump if it won't power down. - Aftermarket accessories: move any constant-draw add-ons to a switched/ignition circuit. When storing the car, enable SRT "Storage Mode" (2018+ SRT, via steering-wheel/center-display menu) or use a battery maintainer/trickle charger to prevent recurrence.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Innova 3320 auto-ranging digital multimeter
Its DC10A input is unfused and the manual limits high-current readings; incorrect series connection can damage the meter or vehicle, so use the exact manual procedure and a current clamp/professional diagnosis when the draw may exceed th…
- NOCO GENIUS5 five-amp charger, maintainer and desulfator
Long-term-storage support after the battery and charging system are known good, or while an infrequently driven vehicle is stored Fitment: Universal 6V/12V lead-acid including AGM and lithium support; it does not locate or repair a paras…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
Kia Sportage · 2020–2025
The infotainment head unit in 2020+ Sportages enters a continuous reboot loop or freezes on the splash screen, leaving the driver without navigation, backup camera, and climate controls (on models with touchscreen-only HVAC). The issue is caused by software bugs and insufficient system memory for the connected services. Firmware updates from Kia have improved but not fully resolved the issue. The problem often occurs after USB device connection or Bluetooth pairing.
Common Symptoms
- Touchscreen continuously rebooting with Kia logo
- Screen frozen and unresponsive to touch
- Backup camera not displaying when in reverse
- Bluetooth disconnecting and reconnecting repeatedly
- Climate controls unresponsive on touchscreen
- Apple CarPlay/Android Auto crashing
How to Fix
Perform a hard reset by pressing and holding the power/volume knob for 10 seconds. If the reboot loop persists, disconnect the vehicle battery for 30 minutes to fully reset the head unit. Visit a Kia dealer for the latest infotainment software update (free under warranty). If the issue continues after the latest firmware, the head unit may need hardware replacement. Avoid connecting USB drives with large music libraries (1000+ songs) which overwhelm the system.
Sources for this issue (1)
Toyota Camry · 2016–2017
Toyota RAV4 · 2016–2018
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U1110 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U1110 mean?
U1110 stands for "Network Communication Fault (manufacturer-specific; commonly Lost Vehicle Speed Message)." U1110 is a manufacturer-specific network (U) code, so its exact meaning varies by automaker. It generally indicates a data-bus communication problem; on several makes (such as Chrysler and Ford) it is associated with a lost or invalid vehicle speed message, meaning a module did not receive the expected speed data over the network. Loss of this data can affect modules that rely on vehicle speed, sometimes causing speedometer, cruise, or related symptoms. The specific definition should be confirmed against the vehicle's service information.
What are the most common causes of U1110?
The most common causes of U1110 are: Wiring or connector fault on the communication bus, Faulty source module (e.g., ABS module sending speed data), Loss of power or ground to a networked module, Corroded connector pins, Bus wiring short or open, Faulty receiving control module. The specific cause varies by vehicle.
How much does it cost to fix U1110?
Repair costs for U1110 range from $140 to $2,000, depending on the vehicle and root cause.
Which vehicles are affected by U1110?
Au7o has documented U1110 across 6 vehicle models from 4 manufacturers: Dodge, Kia, RAM, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.