C0745Electric Power Steering Overtemperature Protection
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Public documentation of C0745 is missing; it is not in the publicly available J2012 tables, in NHTSA bulletins or in maker indexes. GM reports an overheated EPS controller as C0176 (PIT5213B). The protection itself is well described in a Delphi patent: instead of relying on thermistors, the controller squares the motor current and runs it through several low-pass filters, each standing for one thermal time constant, the slowest close to 2,000 s. When a filter exceeds its limit, motor current is reduced step by step, more strictly when the motor is stalled against a lock. The example motor handles 15 A continuously or 75 A for about 5 s. Long parking manoeuvres or holding full lock therefore make the steering heavier until the unit cools down.
- What you may notice
- Steering gradually heavier after repeated manoeuvring
- Power steering warning message
- Likely causes
- LikelyLong parking manoeuvres or holding the wheel at full lock
- PossibleStiff steering gear, joints or tyres raising motor load
- RareTemperature estimate or sensor in the module faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.