U3003Battery Voltage
- Generic OBD-II code · Network
- How the car detects it
- U3003 is logged when the supply a module measures at its own pins leaves the band it needs; the byte gives the direction: :16 too low, :17 too high, :1C out of range, :68 a logged event. GM's front camera module sets it below 9.0 V or above 16.0 V after 3 s in Run and then switches off adaptive cruise, without MIL. Mazda's MT-006/18 links U3003:16 in the CX-5 and CX-9 power liftgate module to a flat battery: recharge, reset, done. Volvo's TJ 34142 ties PSCM U30031C at cranking in start/stop cars to a battery support module switch and asks for both batteries above 12.4 V; Ford's SSM 49662 reports U3003:68 in the 2018 F-150 steering module after auto start-stop on a low battery. Each module stores its own entry, so several at once point to the battery or charging.
- What you may notice
- Comfort or assistance function inoperative, e.g. power liftgate or adaptive cruise
- Reduced steering assist message during cranking or after start-stop
- The same code stored in several modules at once
- Likely causes
- LikelyLow state of charge or aged 12 V battery
- PossibleAlternator or DC/DC converter charging too little or too much
- PossibleVoltage dip while cranking or restarting in start/stop mode
- RareCorroded fuse, connector or ground in the feed to that module
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.