GM Service Manual Online
For 1990-2009 cars only

DTC

United States/

Canada

RPO NC1, NF2, and NB6

Unleaded Export

RPO NN8

Leaded Export

RPO NM2

Heavy Duty

Greater than 8,600 GVW

DTC P0500

B

B

B

B

DTC P0704

B

B

B

B