U1110: How to Diagnose & Fix — Network Communication Fault (manufacturer-specific; commonly Lost Vehicle Speed Message)
4 vehicles · 3 makes · $140-$1,200 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.
Toyota Camry · 2016–2017
Toyota T-SB-0003-19 covers specified Fujitsu Ten Entune Audio, Audio Plus and Premium Audio head units in 2016-2017 Camry and Camry Hybrid vehicles. Depending on unit and software version, listed conditions include intermittent reboot or freeze, Bluetooth disconnect/operation problems, backup-camera display timing, missing/mismatched audio information, phone-book or message issues and DTC U1110, B15E6 or U0293.
Common Symptoms
- Head unit reboots intermittently
- Intermittent freeze condition
- Intermittent Bluetooth disconnection or abnormal operation
- Backup camera stays on too long
- Audio or phone information is missing or mismatched
How to Fix
Record the exact symptom, head-unit panel ID and current software versions. Apply T-SB-0003-19 only to a listed Fujitsu Ten unit with software older than Toyota's specified version; follow the bulletin's controlled USB update and verification steps. If the software is current, Toyota says the bulletin does not apply and normal diagnosis continues. Do not replace the head unit, erase all pairings or assume a power-button reset is a repair unless the exact diagnostic procedure calls for it.
Owner tips & cautions
- TipPhotograph the panel ID and software-version screens before updating; T-SB-0003-19 only applies to listed Fujitsu Ten units below Toyota's specified versions.
- WarningDo not interrupt accessory power during Toyota's update sequence. If the unit is already current, continue diagnosis instead of repeating or forcing the update.
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) Power-window self-cycling — 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. 2) TIPM failure — 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. 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.
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
- 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. - Aftermarket accessories: move any constant-draw add-ons to a switched/ignition circuit.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
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…
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Sources for this issue (3)
RAM 2500 · 2006–2012
The TIPM is the central under-hood fuse/relay and power-distribution computer that controls the fuel pump, lighting, wipers, door locks, horn, and trailer-tow circuits. It is a widespread failure point on 2006-2012 Ram trucks; 2013 and later trucks use a Power Distribution Center instead. The most common complaint is the internal fuel pump relay sticking: stuck ON causes overnight battery drain and the pump running with the key off, while stuck OFF causes intermittent no-start / stalling. Other failures include inoperative wipers, dead door locks, non-working turn signals/high beams, phantom horn, and dead trailer lights. Root causes include water intrusion into the layered module and improperly spliced aftermarket accessories overloading circuits.
Common Symptoms
- No-start or intermittent crank-no-start
- Fuel pump runs with key off / dead battery overnight
- Wipers, door locks, or horn inoperative
- Turn signals or headlights not working
- Trailer tow lights dead
- Random electrical gremlins / stalling
How to Fix
Diagnose which circuit is affected before replacing. A stuck fuel pump relay can be temporarily addressed with an external fuel-pump relay bypass harness, but the durable fix is to rebuild the existing TIPM (specialist shops like Circuit Board Medics repair the boards/relays) or replace it with a new module that must be programmed to the VIN. Remove any improper accessory splices feeding off TIPM circuits. Inspect for and seal water intrusion at the module.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- 2006-2009 Dodge Ram TIPM exchange service
Selected 2006-2009 Dodge Ram 1500/2500/3500/4500/5500 applications; VIN, original part number, options and stated exclusions must be checked. Core return applies.
- Dorman 599-914 remanufactured TIPM
Requires scan-tool programming and adaptive learning; verify original module number and configuration.
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 (3)
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 $1,200, depending on the vehicle and root cause.
Which vehicles are affected by U1110?
Au7o has documented U1110 across 4 vehicle models from 3 manufacturers: Dodge, RAM, Toyota.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.