Network, generic (extended)

U3011 Ignition Input Off

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U3011 relates to the input that tells a module the ignition is off, for instance a key-in or off-state line. The code is set when that input reports off while the network says the car is running, or fails to report off when every other source does. This matters because modules plan their shutdown around it: Ford's patent US5945745A describes control modules that run fully while an ignition detector sees the ignition and drop into a low-current sleep once the signal disappears. A false off can therefore cut functions while driving, and a missing off can keep modules awake and draw the battery down. GM's 2012 truck wiring manual likewise lets the body controller sleep only with the switch off and the key out. No manufacturer documents U3011 publicly.

Likely causes

Faulty key-in or off-position contact in the switch
Off-state input wire open or shorted
Body control module reporting a wrong power mode
Faulty input stage in the reading module

Symptoms

  • Modules not going to sleep, battery drained after parking
  • Functions switching off briefly while driving

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ignition inputignition switchignition wiring

Related codes

U300CU3022U300AU3012U3001

References: law.cornell.edu, patents.google.com, gmupfitter.com.