AutoCodes – Acura – P1486 Acura

P1486 Acura Code - Cooling System Malfunction

Quick Answer

The Engine Coolant Thermistor (ECT) is a 2-wire thermistor. Common causes include Low engine coolant level, Insufficient warm uptime, Leaking or stuck open thermostat. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1486 Acura indicates Cooling System Malfunction.
Common causes: Common causes include Low engine coolant level, Insufficient warm uptime, Leaking or stuck open thermostat.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 19,172

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 08, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P1486 Acura Description

The Engine Coolant Thermistor (ECT) is a 2-wire thermistor. As Engine coolant temperature increases, thermistor resistance & signal voltage decreases. The Engine Control Module (ECM) monitors ECT voltage to help determine injector pulse width, ignition timing, and idle control. The Transmission Control Module (TCM)/ECM uses ECT voltage for shift timing & quality. The Diagnostic Trouble Code (DTC) indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

OBDII Code P1486 Acura - Cooling System Malfunction - AutoCodes.com — P1486 Acura Code - Cooling System Malfunction

What does this mean?

What are the Possible Causes of the DTC P1486 Acura?

Low engine coolant level
Insufficient warm uptime
Leaking or stuck open thermostat
Faulty engine coolant temperature sensor
Engine coolant temperature sensor harness is open or shorted
Engine coolant temperature sensor circuit poor electrical connection

How to Fix the DTC P1486 Acura?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

If the cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.

When troubleshooting a 2000-2001 Accord or 2001-2002 Civic, if the PGM Tester tells you there is a DTC P0128 (Cooling System Malfunction) or P1486 (Cooling System Malfunction) set, it's really reporting the same thing. DTC P0128 is an SAE or generic Diagnostic Trouble Code (DTC) while P1486 is a manufacturer-specific DTC. Since these DTCs are similar, the PGM Tester sometimes reports a P0128 when it detects a P1486 or vice versa.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1486 Acura code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.