U1530 on 2013-2019 Cadillac XTS (Luxury, Premium, Platinum, V-Sport, Vsport) — K9 Body Control Module Lost Communication with M35P Window Motor Module - Passenger / M74P Window Motor - Passenger on LIN Bus
1 vehicles · 1 makes · $200-$900 repair
Most Reported On
U1530 is an OBD-II diagnostic trouble code meaning “K9 Body Control Module Lost Communication with M35P Window Motor Module - Passenger / M74P Window Motor - Passenger on LIN Bus.” The Body Control Module (K9) is the LIN master for the door/window motor modules. U1530 sets when the BCM stops receiving the expected LIN response frames from the passenger window motor module (M35P) or passenger window motor (M74P). GM groups it with the whole U1500-U15FF common-LIN family under one diagnostic procedure. It matters for parasitic-drain complaints because a LIN slave that will not answer, or that keeps re-driving the bus, prevents the BCM from completing its bus-quiet check and keeps the network — and therefore the modules on it — from entering sleep mode. This code is most commonly reported on 2013-2019 Cadillac XTS (Luxury, Premium, Platinum, V-Sport, Vsport), with repair costs ranging from $200 to $900.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
U1530 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does U1530 mean?
U1530 stands for "K9 Body Control Module Lost Communication with M35P Window Motor Module - Passenger / M74P Window Motor - Passenger on LIN Bus." The Body Control Module (K9) is the LIN master for the door/window motor modules. U1530 sets when the BCM stops receiving the expected LIN response frames from the passenger window motor module (M35P) or passenger window motor (M74P). GM groups it with the whole U1500-U15FF common-LIN family under one diagnostic procedure. It matters for parasitic-drain complaints because a LIN slave that will not answer, or that keeps re-driving the bus, prevents the BCM from completing its bus-quiet check and keeps the network — and therefore the modules on it — from entering sleep mode.
What are the most common causes of U1530?
The most common causes of U1530 are: Failed passenger window motor module / window motor with integrated LIN electronics, Open, shorted or high-resistance LIN circuit between the BCM and the passenger door module — commonly a broken wire in the door-jamb harness boot, Water intrusion or corrosion at the door connector or inside the door module, Loss of ignition/battery feed or ground to the window motor module, Body Control Module fault or software concern. The specific cause varies by vehicle.
How much does it cost to fix U1530?
Repair costs for U1530 range from $200 to $900, depending on the vehicle and root cause.
Which vehicles are affected by U1530?
Au7o has documented U1530 across 1 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.