C052DABS Pump Motor Control Circuit High
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- The pump motor control circuit reads higher than the commanded state allows, which normally means the control line or motor terminal is shorted toward battery voltage or the switching stage is stuck on. No manufacturer publishes this code; Mitsubishi, for example, reports its pump motor faults under C052B and C052C. The Bosch fault-monitoring patent US5329238 shows the principle: terminal voltages are compared with supply-referenced limits, a level above the upper one is taken as a short to plus, and the drive is then cut. With a stuck-on stage the pump may hum continuously and drain the 12 V battery. The US brake standard FMVSS 135 requires a warning for any electrical ABS failure; normal braking without ABS remains.
- What you may notice
- ABS warning lamp on
- Pump motor runs continuously or hums with ignition on
- Battery discharged after standing
- Likely causes
- LikelyMotor relay or semiconductor switch in the ABS unit stuck closed
- PossibleMotor lead or control line shorted to battery voltage
- RareMoisture bridging pins in the ABS connector
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.