C1002: ABS Hydraulic Pump Motor Circuit Open
3 vehicles · 2 makes · $300-$1,500 repair
Most Reported On
C1002 is an OBD-II diagnostic trouble code meaning “ABS Hydraulic Pump Motor Circuit Open.” This chassis code means the ABS module detected an open (broken) electrical circuit to the anti-lock brake system's hydraulic pump motor. That pump motor builds and releases brake-line pressure during ABS, traction-control, or stability-control events, so the module continuously checks that it can power the motor. An 'open circuit' means current can't flow — usually a wiring, connector, ground, or motor fault. Your normal brakes still work, but ABS and related stability features will typically be disabled with warning lights on. This code is most commonly reported on 2009-2013 Ford Flex, 2012-2019 Fiat 500 (Pop, Sport, Lounge, Turbo, Abarth), and 2014-2020 Ford Transit Connect, with repair costs ranging from $300 to $1,500.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C1002, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (3)
FAQ
What does C1002 mean?
C1002 stands for "ABS Hydraulic Pump Motor Circuit Open." This chassis code means the ABS module detected an open (broken) electrical circuit to the anti-lock brake system's hydraulic pump motor. That pump motor builds and releases brake-line pressure during ABS, traction-control, or stability-control events, so the module continuously checks that it can power the motor. An 'open circuit' means current can't flow — usually a wiring, connector, ground, or motor fault. Your normal brakes still work, but ABS and related stability features will typically be disabled with warning lights on.
What are the most common causes of C1002?
The most common causes of C1002 are: Open or broken wiring to the pump motor, Corroded, loose, or disconnected connector at the ABS unit, Failed ABS pump motor, Blown fuse or faulty relay feeding the pump, Poor ground connection, Faulty ABS control module/hydraulic unit, Low battery voltage or charging system fault. The specific cause varies by vehicle.
How much does it cost to fix C1002?
Repair costs for C1002 range from $300 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by C1002?
Au7o has documented C1002 across 3 vehicle models from 2 manufacturers: Fiat, Ford.
Sources (6)
- owner-reportFord Flex Years To Avoid — Mark Regan Auto
- ForumFiat 500 USA Forum: Power Steering Cutting Out
- mediaECU Testing: Fiat 500 Power Steering Fault
- mediaBlackcircles: Common Fiat 500 Faults / Recall List
- manufacturerSINSPEED: Fiat 500 Electric Power Steering (EPS) Column Rebuild
- ForumReddit r/MechanicAdvice thread discussing 2015 Ford Transit Connect power steering assist motor failure
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.