P2178 or P2180

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Before the ECM can report DTC P2178 or P2180, failed, DTCs P0008, P0009, P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0101, P0121, P0122, P0123, P0133, P0153, P0201, P0202, P0203, P0204, P0205, P0206, P0221, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0335, P0336, P0338, P0443, P0458, P0459, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091, P2092, P2093, P2094, and P2095 must run and pass.
The engine speed is between 1,200-3,400 RPM.
The mass air flow (MAF) is less than 83 grams/second.
The throttle angle is less than 100 percent.
The engine load is between 17-45 percent.
The fuel system is in closed loop.
The engine is not in decel fuel cut-off (DEFCO).
The long term fuel trim is active.
The engine coolant temperature (ECT) is greater than 60°C (140°F).
The intake air temperature (IAT) is less than 61°C (142°F).
The evaporative emission (EVAP) canister purge solenoid valve is not enabled.
The fuel level is greater than 12 percent.
The amount of air flow into the engine is greater than 7,000 grams.
DTC P2178 and P2180 run continuously once the above conditions are met for at least 300 seconds.