LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2012 >> Tahoe Base, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> DTC U1820 >> Diagnostic Fault Information
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Ignition Voltage (circuit 948) U1820*, U189A in HPCM, U1818 in SDGM U1820*, U189A in HPCM, U1818 in SDGM -  
Ground (circuit 950) - U1820*, U189A in HPCM, U1818 in SDGM -  
PTLAN + (circuit 6105) U0074* U1820*, U189A in HPCM, U1818 in SDGM U0074* -
PTLAN - (circuit 6106) U0074* U1820*, U189A in HPCM, U1818 in SDGM U0074* -
* Other modules/DTCs will set with this fault.