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Home >> Chevrolet >> 2010 >> Avalanche 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1866 >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
BCM B+ U1866*, U0140 in EBCM U1866*, U0140 in EBCM - -
BCM Ground - U1866*, U0140 in EBCM - -
HSGMLAN + (circuit 2500) 1* U1866*, U0140 in EBCM 1* -
HSGMLAN - (circuit 2501) 1* U1866*, U0140 in EBCM 1* -
* Other modules/DTCs will set with this fault.
1. Scan tool does not communicate with high speed GMLAN device.
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