P0528 - Fan Speed Sensor Circuit High
The fan-speed sensor signal is higher than expected.
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Common Next Steps
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Confirm external leaks, cap behavior, and pressure loss before parts.
Compare warm-up, scan temperature, and hose temperature behavior.
Check fan command, AC-load response, fuses, relays, and airflow.
Related Inspection
Code Overview
The fan-speed sensor signal is higher than expected.
Common Causes
- Failed fan-speed sensor
- Cooling fan or control issue
- Damaged wiring or connector
Diagnostic Steps
- Inspect sensor and fan wiring
- Compare fan-speed data to actual fan operation
- Check for relay, fuse, or control faults
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Next Steps
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