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Silver bullet needed :-)
Came in with CEL on, no performance complaints. Checked codes, P0154. Monitored B1S1 and B2S1 data PID's- B1S1 normal, B2S1 flat at .45v. Tested circuits and found 5V on B2S1 tan wire, which is sensor ground. It actually powered my LED test light on the harnes... Login to read more. 
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| Engine | 6.0 L |
| Trans | 5-speed Automatic (Electronic) |
Vehicle Data
2003 GMC Sierra 2500 HD 6.0L
| Engine | 6.0 L |
| Trans | 5-speed Automatic (Electronic) |
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