P1486moderate severityPowertrain
Thermostat Range/Performance Problem
on 2017 Honda Civic 1.5L I4 Turbo · FWD
What this code means
The engine coolant isn't reaching or holding the expected temperature, pointing to a thermostat issue. Similar to OBD generic P0128.
Symptoms
- Check engine light on
- Slow engine warm-up
- Poor heater output
Common causes
- Stuck-open thermostat
- Faulty coolant temp sensor
- Low coolant level
- Cooling system fault
Diagnostic steps
- Scan and confirm P1486
- Monitor coolant temp during warm-up
- Inspect thermostat operation
- Verify coolant temp sensor readings
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Other Powertrain codes on this vehicle
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P0002
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P0003
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P0004
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P0010
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P0011
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P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
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P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1