The ABS pump in your 2020 Dodge Charger normally operates only during ABS activation events on slippery surfaces. When the pump runs constantly or cycles repeatedly during normal driving, a fault is preventing normal system function—this wastes energy, causes pump wear, and may indicate serious brake system issues.
Normal ABS Operation
The ABS pump should only activate when wheel lockup is detected during hard braking, typically on slippery surfaces. A brief startup self-test is normal. During normal driving and braking, the pump should be silent. Constant operation indicates the system is continuously trying to regulate pressure.
Wheel Speed Sensor Failures
ABS monitors wheel speed through sensors at each wheel. A failed or erratic sensor sends incorrect data suggesting wheel lockup when none exists. The system responds by cycling the pump to release non-existent lockup. This continuous false activation runs the pump continuously.
Hydraulic Unit Internal Leaks
The ABS hydraulic unit contains valves and passages that maintain brake pressure. Internal leaks within the unit cause pressure loss that the pump continuously tries to restore. This creates endless cycling as pressure builds then immediately leaks away.
Accumulator Pressure Loss
Some ABS systems include an accumulator storing pressurized fluid. If the accumulator can't hold pressure due to internal failure, the pump runs continuously trying to restore target pressure. This component may be integrated with the hydraulic unit.
Code C1035 Analysis
Code C1035 relates to ABS hydraulic pump motor or circuit faults. This may indicate the pump is commanded on constantly due to other system faults, or the pump motor itself has issues. Associated codes often reveal the root cause triggering pump activation.
Wiring and Connection Issues
Damaged wheel speed sensor wiring, corroded connections, or electromagnetic interference can create erratic signals triggering ABS activation. Inspect wiring at all four wheel speed sensors, particularly in areas exposed to road debris and weather.