P0529Fan Speed Sensor Circuit Intermittent
- 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. P0529 means the speed signal drops out or jumps at times. It is documented only for Ford's 6.7 L Power Stroke in the 2016–2019 Super Duty and F-650/750: a Ford service message lists it with P0480, P0494, P0495 and P0691–P0694 for fans running permanently or not at all, and warns against replacing the clutch too early – check wiring, connector and sensor first. Ford's summaries give no thresholds.
- What you may notice
- Check engine light (depending on the maker)
- Fan running permanently or not at all
- Loud fan noise
- Likely causes
- LikelyLoose contact at connector or wiring at the fan (vibration, chafing)
- PossibleSensor in the fan clutch intermittently faulty
- RareClutch itself faulty
- 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: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.