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2005 Honda Civic Si P2646 Fault Code: Not in Service Manual? Help Needed

Model: 05 Civic Si Fault Code: P2646 Posted: 2006-07-16 19:34

My 2005 Honda Civic Si is not revving past 4,000 RPMs. The vehicle exhibits a persistent issue where the engine fails to accelerate beyond this point. I've checked the service manual but cannot find any reference for fault code P2646. Can anyone confirm if this code is recognized or provide guidance on how to diagnose and resolve this issue? Any insights would be greatly appreciated.

Related fault codes
P2646
Comments (1)
Anonymous 2006-07-17 20:37

Could you please share the engine size, current mileage, and whether the vehicle has been serviced recently? If the car has under 36,000 miles, it's worth considering a visit to an authorized Honda dealer. They offer a 3-year/36,000-mile bumper-to-bumper warranty, which may cover this issue—though I'm not certain if that applies to all P2646-related problems.