Makes 🢒 Chevrolet 🢒 2004 🢒 Express (CNG) 🢒 Engine 🢒 Engine Controls - 6.0L 🢒 DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610