C1785 on 2007-2015 Jaguar XK (XK, XKR, XKR-S) — EPB Motor Output Open Circuit
1 vehicles · 1 makes · $500-$1,300 repair
Most Reported On
C1785 is an OBD-II diagnostic trouble code meaning “EPB Motor Output Open Circuit.” The Electronic Parking Brake (EPB) module drives the parking brake actuator motor and monitors current flow on its output. C1785 sets when the module commands the motor to run but sees an open circuit on the motor output — no current path — so the actuator cannot be driven. Jaguar documentation notes this fault can only be detected while the EPB motor is running, i.e. during an apply or release cycle. This code is most commonly reported on 2007-2015 Jaguar XK (XK, XKR, XKR-S), with repair costs ranging from $500 to $1,300.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
C1785 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 C1785 mean?
C1785 stands for "EPB Motor Output Open Circuit." The Electronic Parking Brake (EPB) module drives the parking brake actuator motor and monitors current flow on its output. C1785 sets when the module commands the motor to run but sees an open circuit on the motor output — no current path — so the actuator cannot be driven. Jaguar documentation notes this fault can only be detected while the EPB motor is running, i.e. during an apply or release cycle.
What are the most common causes of C1785?
The most common causes of C1785 are: Open or broken EPB motor output wiring between module and actuator (common at the rear harness / underbody routing), Corroded or water-intruded EPB actuator connector, Failed EPB actuator motor (open windings or worn brushes), Failed EPB control module output driver, Blown EPB motor fuse. The specific cause varies by vehicle.
How much does it cost to fix C1785?
Repair costs for C1785 range from $500 to $1,300, depending on the vehicle and root cause.
Which vehicles are affected by C1785?
Au7o has documented C1785 across 1 vehicle models from 1 manufacturers: Jaguar.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.