C1728 on 2003-2017 Ford Expedition — EPS Motor Over-Temperature
1 vehicles · 1 makes · $300-$1,500 repair
Most Reported On
C1728 is an OBD-II diagnostic trouble code meaning “EPS Motor Over-Temperature.” This chassis code relates to an over-temperature condition in the electric power steering (EPS) motor, the electric motor that provides power-assist for the steering. The steering control module monitors the motor's temperature (directly or by estimating it from current draw and time), and when it gets too hot the system sets this code and temporarily reduces or cuts steering assist to protect the motor from heat damage. Drivers often notice the steering becoming heavy until the system cools down. It frequently follows prolonged hard steering, but can also indicate an electrical fault that makes the motor draw excessive current. This code is most commonly reported on 2003-2017 Ford Expedition, with repair costs ranging from $300 to $1,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C1728, 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+).
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- 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)
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- 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
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- 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
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FAQ
What does C1728 mean?
C1728 stands for "EPS Motor Over-Temperature." This chassis code relates to an over-temperature condition in the electric power steering (EPS) motor, the electric motor that provides power-assist for the steering. The steering control module monitors the motor's temperature (directly or by estimating it from current draw and time), and when it gets too hot the system sets this code and temporarily reduces or cuts steering assist to protect the motor from heat damage. Drivers often notice the steering becoming heavy until the system cools down. It frequently follows prolonged hard steering, but can also indicate an electrical fault that makes the motor draw excessive current.
What are the most common causes of C1728?
The most common causes of C1728 are: Prolonged hard or full-lock steering causing thermal overload, Faulty or shorting EPS motor drawing excess current, Low system voltage forcing higher current draw, Faulty temperature sensor or estimation circuit, Wiring or connector fault in the EPS motor circuit, Failing EPS control module, Mechanical steering bind increasing motor load. The specific cause varies by vehicle.
How much does it cost to fix C1728?
Repair costs for C1728 range from $300 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by C1728?
Au7o has documented C1728 across 1 vehicle models from 1 manufacturers: Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.