P0528 — No signal from the fan speed sensor circuit

The engine control module is not receiving any signal from the fan speed sensor. This sensor monitors how fast the cooling fan is spinning. Without this data, the system cannot confirm if the fan is working properly, which may lead to engine overheating if the fan fails.

Common causes

The cause is almost always one of a few things. Here they are — P0528 rarely comes from anything outside this list:

• Faulty or failed fan speed sensor
• Damaged or corroded wiring/connectors in sensor circuit
• Blown fuse related to fan or sensor circuit
• Faulty cooling fan motor or control module

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Check and replace any blown fuses related to fan circuit
2. Inspect and repair wiring and connectors for damage or corrosion
3. Test and replace the fan speed sensor if faulty
4. Check cooling fan operation and replace fan motor if needed

That is what holds for P0528 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.