P0528Fan Speed Sensor Circuit No Signal
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Engine-driven fans with an electronically controlled viscous clutch (GM petrol SUVs and pick-ups 2004–2006, GM Duramax, Ford 6.7 L Power Stroke) have a Hall sensor reporting fan speed; the fan checks P0483, P0494 and P0495 need it. P0528 means no pulses arrive from the sensor although the fan should be turning. No manufacturer document available to us uses P0528 – GM detects exactly this state (fan below 4 rpm with the engine running) but reports it as P0526. CARB requires input components to be checked for open and short circuits.
- What you may notice
- Check engine light (depending on the maker)
- Fan permanently on or not at all
- Tendency to overheat
- Likely causes
- LikelySensor faulty
- PossibleWire open or connector off
- PossibleFan or clutch really not turning
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.