Rick's Free Auto Repair Advice

P0740 P0753 P0758 P0785 P1860

Fix code P0740 P0753 P0758 P0785 P1860

GM has issued a technical service bulletin 01-07-30-002C for the vehicles listed below. GM has advised that the most likely cause for a check engine light and trouble codes P0740, P0753, P0758, P0785, and P1860 may be a faulty ignition switch that causes an open circuit to the transmission. Other symptoms include a Check Engine light on, transmission stuck in third gear, and an instrument cluster that doesn’t work.

1999-2000 Cadillac Escalade
2002-03 Cadillac Escalade, Escalade EXT
2003 Cadillac ESV
1997-1999 Chevrolet Full Size Pickup, Suburban, Tahoe
1997-2003 Chevrolet Blazer, Express, S-10
1999-2003 Chevrolet Blazer RH Drive
2002-03 Chevrolet Avlanche, TrailBlazer, TrailBlazer EXT
1997-1999 GMC Sierra, Suburban, Yukon
1997-2001 GMC Jimmy
1997-2003 GMC Savana, Yukon, Yukon XL
2002-03 GMC Envoy, Envoy XL
1997-2003 Oldsmobile Bravada
2002-2003 Oldsmobile Bravada

GM advises that you start your diagnostics by turning the key to the RUN position and checking for battery voltage at the following fuses: If you don’t get battery voltage, replace the ignition switch.

p0740 p0753 p0758 p0785 p1860

Ignition switch at base of steering column

1997 S/T Trans 24
1998-2003 S/T Cluster 11
2002-2003 S/T Ign 0
1997-2000 C/K Trans 20
1999-2003 C/K Ign 0
1997-2003 G-van Trans 20
2003 G&H Ign 0
2003 H2 Ign 0


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