Conditions for Running the DTC
WARNING: This page is about a different car, the 2017 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
P0685, P0686, P0687
The DTC runs when ignition voltage is greater than 11 V.
P0689
- DTC P0685, P0686, or P0687 is not set.
- The engine controls ignition relay is commanded ON.
- Ignition 1 signal voltage is greater than 11 V.
- The DTC runs continuously when the above conditions are met.
P0690
- DTC P0685, P0686, or P0687 is not set.
- The engine controls ignition relay is commanded OFF.
- The DTC runs continuously when the above conditions are met.
P1682
- The engine controls ignition relay is commanded on.
- Ignition 1 signal voltage is greater than 5.5 V.
- The DTC runs continuously when the above conditions are met.