OBD-II code · Chassis
C05A5 ABS Pump Motor Supply Voltage B Circuit/Open
Open circuit on ABS pump motor supply voltage B (second redundant supply rail).
Is it safe to drive with C05A5?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyFuse 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
- ABS Pump Supply B, Fuse
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.