What are common causes for U3005?

RAP relay or BCM logic failed (high) · Gateway module routing CAN messages incorrectly (low) · CAN terminating resistor (120 Ω) drifted out of spec (low)

What symptoms does U3005 show?

Multiple warning lights may illuminate · Affected modules may go into limp mode or shut down · Specific functions inoperative depending on module · Diagnostic tools may show communication faults

Network generic or reserved

U3005

Retained Accessory Power

Fault on the retained accessory power (RAP) function that keeps comfort loads (windows, radio) powered for a short time after the key is removed.

SystemNetwork

Typegeneric or reserved

GroupU3

Range / number– / 05

Possible causes

RAP relay or BCM logic failed high
Gateway module routing CAN messages incorrectly low
CAN terminating resistor (120 Ω) drifted out of spec low

Symptoms

Multiple warning lights may illuminate
Affected modules may go into limp mode or shut down
Specific functions inoperative depending on module
Diagnostic tools may show communication faults

Inspection / repair

Difficulty: medium
DIY: possible
Estimated cost: 50–500 €
Estimated time: 0.5–2 h
Component: rap relay
Component: body control module
MIL / check engine light

Sources

github.com/Wal33D/dtc-database
Wikipedia · Body control module

References

sae:J2012