Diagnostic Aids
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- A malfunction in the following components may also cause DTC P026C, P026D to set:
- B75C Multifunction Intake Air Sensor
- B195A Nitrogen Oxides Sensor 1
- Q14 Exhaust Gas Recirculation Valve
- B74 Manifold Absolute Pressure Sensor - Flow Restricted
- Q14 Exhaust Gas Recirculation Valve - Binding or Sticking
- Modifications to the intake air systems may cause this DTC to set.
- Fuel - Contamination