OBD-II code · Chassis
C0539 Motor Control B Supply Voltage Circuit/Open
Motor Control B Supply Voltage Circuit/Open: the circuit is open. Likely a broken wire, disconnected connector, or failed component.
Is it safe to drive with C0539?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySupply fuse blown
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Chassis Motor B, Fuse
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.