Network, generic (extended)

U3005 Retained Accessory Power

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U3005 relates to retained accessory power (RAP), which keeps radio, windows or sunroof alive for a while after the key is switched off. GM's truck manual explains the logic: the body module holds its internal RAP relay for about ten minutes after key-off, and ends RAP early when a door opens or battery voltage sinks below a calibrated limit; some modules get the RAP state as a bus message instead. No manufacturer documents U3005 itself publicly, so the code most likely flags a RAP output or message that does not follow these rules. GM's PIE0724 for 2022 Silverado, Sierra and Envision shows the typical consequence of a RAP fault: radio still on afterwards and a dead battery, checked with a parasitic draw test against 50 mA. Not emission-related, no MIL.

Likely causes

RAP relay or output stage staying on or not switching on
Faulty door switch signal, so RAP is not ended on door opening
Body module or radio software handling the RAP state wrongly
Wiring fault or add-on device back-feeding the accessory circuit

Symptoms

  • Radio, windows or sunroof working long after key-off or not at all after key-off
  • High parasitic drain and flat battery

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–500
Time0.5–3 h

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

Parts involved

rap relaybody control module

Related codes

U3004U300FU3003U3001

References: gmupfitter.com, static.nhtsa.gov.