U302B
Ignition Output Accessory/On/Start
U302B is an OBD-II diagnostic trouble code meaning: Ignition Output Accessory/On/Start. Common causes: faulty ignition relay, blown fuse. Estimated repair cost: $6–56.
Severity
⚠️ MediumCan you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)
Symptoms
- Engine won't start
- Problems turning on the ignition
- Unstable operation of electrical equipment
- Check Engine Light Is On
- The car may suddenly stall
Causes
- Faulty ignition relay
- Blown fuse
- Wiring harness damage
- Ignition switch malfunction
- Problems with the engine control unit
How to Fix
- Check and replace fuses
- Diagnose the ignition relay
- Check wiring integrity
- Test the ignition switch
- Scan the control unit for other errors
Related codes
Error U302B by Vehicle Brand
AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye
FAQ
What does the U302B code mean?
U302B is an OBD-II diagnostic trouble code that indicates: Ignition Output Accessory/On/Start
What causes a U302B error code?
The most common causes of U302B include: Faulty ignition relay; Blown fuse; Wiring harness damage; Ignition switch malfunction.
How do I fix a U302B diagnostic trouble code?
To fix U302B: Check and replace fuses. Diagnose the ignition relay. Check wiring integrity. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U302B?
Do not drive — repair immediately
How much does it cost to fix U302B?
The estimated repair cost for U302B is $6–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat