[drtye]

OK,

That VIN puts it as a 2009 Civic SI Coupe.

According to this table, it should have a PNN4, HOWEVER, this chart was made years and years and years ago. as in made back in 2005 and hasn't been updated much if at all past about 2007. I would assume that the ratios are the same as a PNN4 transmission and that the chart never was updated for the facelift 8th gens. My digging is showing that the FN2 transmission will have a code of SPWN.

here are the 2009 civic design specs pulled right from the FSM. No transmission 'build' code is listed but it does give the same specs as given on the chart. Very likely that Honda switched over the ID for the 2009-2011 Civic SI.

Item​	Measurement​	Qualification​	Specification​
CLUTCH​	Type​	​	Single plate dry, diaphragm spring​
MANUAL TRANSMISSION (5-speed: '06-10 models)​	Type​	​	Synchronized, five-speed forward, one reverse​
Primary reduction​	​	Direct 1:1​
Gear ratio​	1st​	3.142​
2nd​	1.750​
3rd​	1.241​
4th​	0.969​
5th​	0.805​
Reverse​	3.230​
Final reduction​	Type​	Single helical gear​
Gear ratio​	4.111​
MANUAL TRANSMISSION (5-speed: '11 model)	Type		Synchronized, five-speed forward, one reverse
Primary reduction		Direct 1:1
Gear ratio	1st	3.142
2nd	1.869
3rd	1.235
4th	0.948
5th	0.727
Reverse	3.307
Final reduction	Type	Single helical gear
Gear ratio	4.294
MANUAL TRANSMISSION (6-speed)​	Type​	​	Synchronized, six-speed forward, one reverse​
Primary reduction​	​	Direct 1:1​
Gear ratio​	1st​	3.267​
2nd​	2.130​
3rd​	1.517​
4th​	1.147​
5th​	0.921​
6th​	0.659​
Reverse​	3.583​
Final reduction​	Type​	Single helical gear​
Gear ratio​	4.765​
AUTOMATIC TRANSMISSION​	Type​	​	Electronically-controlled automatic, five-speed forward, one reverse, three-element torque converter with lock-up clutch​
Primary reduction​	​	Direct 1:1​
Gear ratio​	1st​	2.666​
2nd​	1.534​
3rd​	1.021​
4th​	0.720​
5th​	0.524​
Reverse​	1.956​
Final reduction​	Type​	Single helical gear​
Gear ratio​	4.437​