U0169
Lost Communication with Sun Roof Control Module
The Sun Roof Control Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Powered sunroof operation stops working. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
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
Common causes
Ordered by how often each turns out to be the cause.
- Sunroof module unpoweredCommon
- CAN wiring to sunroof module brokenPossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Sun Roof Module
- CAN Bus Wiring
U0169 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.