DTC 45 - EGR Vent Error: Notes
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
When the PCM recognizes the operating range for no EGR, the PCM energizes the EGR vent solenoid which allows rapid venting of EGR vacuum. This solenoid is normally open. DTC 45 will set when no ignition voltage is present on the EGR vent control circuit when EGR vent is commanded on. PCM will default to shut off the EGR system.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This step determines if DTC 45 is the result of a hard failure or an intermittent condition.
- This step checks if PCM and wiring are okay.
- This step checks the power and control circuit.