C052C

Code

Generic C — Chassis

ABS Pump Motor Control Circuit/Open

Brand: Generic

Type: C — Chassis

Views: UK: 22 EN: 62 RU: 31

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Read and record freeze-frame and stored ABS/traction codes with a scan tool
Visually inspect pump motor connector, wiring harness, and grounds for corrosion, damage, or disconnection
Check related fuses and pump/ABS relays for continuity and proper operation
Measure battery voltage at pump connector with ignition ON and during pump command
Measure resistance/continuity of pump motor windings and between module and motor
Command pump ON via scan tool and observe voltage, current draw, and motor response

Supply voltage at pump connector: ~12 V (battery voltage) with ignition ON
Control signal: module switches supply or ground; expect switching voltage to appear when pump is commanded
Pump motor winding resistance: typically low (example range 0.5–3 ohms) — exact spec varies by vehicle
Running current: typically several amps (example 5–25 A); stalled or start current may be higher
PWM control (if used): frequency commonly 100–1000 Hz, duty cycle varies 0–100% when commanded

Use a scan tool to confirm C052C and any related codes; note freeze-frame and attempt an ABS pump command if available.
Visually inspect pump connector, wiring harness, protective sleeving, and ground points for corrosion, chafing, or disconnection.
Check fuses and pump/ABS relays; replace suspect items and test again.
With ignition ON, backprobe the pump power and ground terminals. Verify battery voltage at supply terminal and good ground continuity to chassis.
Command the pump ON via scan tool while measuring voltage at the pump connector. If no voltage change, measure at module output pins to determine if module is commanding.
Measure resistance of pump motor windings (with connector disconnected). An open or infinite reading indicates a failed motor.
If wiring to the motor shows open/high resistance, trace and repair broken conductors or corroded connectors. Repair splices with appropriate automotive repair methods.
If pump and wiring are good but no control signal from module, test/replace the pump relay (if fitted) or consider module driver fault — consult manufacturer-specific diagnostics before replacing module.
After repair, clear codes, perform ABS pump function tests, and road test to confirm no recurrence and proper ABS operation.