U0293: How to Diagnose & Fix — Lost Communication With Hybrid Powertrain Control Module
2 vehicles · 1 makes · $100-$500 repair
How to diagnose and fix U0293: 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 Venza · 2021–2024
The 2nd-gen Venza Hybrid can experience 12V auxiliary battery drain and hybrid system errors. The 12V battery drains prematurely if the vehicle sits for more than a week, and some owners report hybrid system warning lights related to inverter communication errors.
Common Symptoms
- Vehicle won't start after sitting more than a week
- 12V battery dead repeatedly
- Hybrid system warning light
- Ready mode won't engage
- Multiple warning lights on dashboard
How to Fix
Replace 12V auxiliary battery with AGM type (Toyota recommends their TrueStart battery). Install a battery tender/maintainer if the vehicle sits for extended periods. For hybrid system errors, dealer software update addresses most communication faults. Ensure the 12V battery terminals are clean and tight.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Toyota TrueStart 00544-H5061-540 H5/LN2 12-volt battery
replace a load/capacity-tested failed auxiliary battery after the root cause of discharge is addressed Fitment/availability: Toyota H5/LN2 540-CCA catalog replacement listed for 2021-2024 Venza Hybrid applications; confirm VIN, dimension…
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)
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)
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U0293 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 U0293 mean?
U0293 stands for "Lost Communication With Hybrid Powertrain Control Module." A controller is no longer receiving the periodic data-bus messages expected from the Hybrid (HEV/EV) Powertrain Control Module, the supervisory controller coordinating engine, motor(s), and high-voltage battery. Set after a calibrated timeout, it indicates lost communication with that module.
What are the most common causes of U0293?
The most common causes of U0293 are: Power/ground or HV-control supply loss to the hybrid powertrain module, Open/shorted bus wiring, Corroded/loose connectors, Failed hybrid powertrain control module, Network/gateway fault. The specific cause varies by vehicle.
How much does it cost to fix U0293?
Repair costs for U0293 range from $100 to $500, depending on the vehicle and root cause.
Which vehicles are affected by U0293?
Au7o has documented U0293 across 2 vehicle models from 1 manufacturers: 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.