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2000 Honda Accord SE Check Engine Light with P1486 Code: Thermostat or ECM Issue?

Model: 2000 Accord SE Fault Code: P1486 Posted: 2006-09-28 00:45

Hello, My 2000 Honda Accord SE has been showing a Check Engine Light (CEL) this morning. The OBD-II diagnostic code retrieved is P1486. Initially, I assumed this was related to emissions, but according to myscantool.com, P1486 specifically indicates a 'Thermostat Range/Performance' issue. Does this mean I need to replace the thermostat? Or could it be related to emission control systems? The vehicle recently completed a 60,000-mile service in July (approximately 5,000 miles ago). Any insights or advice would be greatly appreciated. Thanks and regards, -Yudi

Related fault codes
P1486
Comments (3)
Anonymous 2006-09-29 17:23

The thermostat is part of the emissions system. A faulty thermostat is a reasonable first step to investigate—ensure there are no leaks in the cooling system or that the radiator fans aren't running continuously. Good luck and please keep us updated. Jeff

Anonymous 2006-10-02 11:01

Thanks, Jeff. I found a Technical Service Bulletin (TSB) related to CEL P1486 or P0128 that recommends replacing the ECM/PCM module—possibly with a firmware update. I took it to a dealer, who charged $139 for diagnosis, even though I informed them of code P1486 and mentioned it's within warranty. The ECM is covered under an 8-year / 80,000-mile warranty. If the issue stems from a faulty ECM, they should waive the diagnostic fee. Thanks again, -Yudi

Anonymous 2006-10-02 12:32

Dealers won't automatically provide parts under warranty just because someone reads the check engine light and shares the code. If the TSB points to an ECM issue, then pay for diagnosis and have the PCM replaced. If you're arguing on principle, consider pricing the PCM yourself—it's likely significantly more than $139. I understand your frustration, but if the PCM is replaced as per diagnosis and the code returns, then you'd be responsible for its cost. Right now, if only $139 gets you a free PCM replacement, that would be an extremely favorable deal—so I’d be laughing all the way to the bank!