2010 Cadillac CTS Sedan AWD V6-3.0L Page 1919
Circuit/System Description
The barometric pressure (BARO) sensor responds to changes in altitude and atmospheric conditions. This gives the engine control module (ECM)
an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor provides a voltage signal to the
ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range.
Conditions for Running the DTC
P2227
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516,
P2135, P2228 and P2229 are not set.
* Engine is running.
OR
* DTCs P0106, P0107, P0108, P2228, P2229 and P2230 are not set and are not pending.
* Ignition ON, engine OFF.
* DTC P2227 runs continuously when the above conditions are met.
P2228 or P2229
* The engine is running.
* The DTCs run continuously when the above condition is met.
P2230
* The engine is running.
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516,
P2135, P2228 and P2229 are not set.
* DTC P2230 runs continuously when the above conditions are met.
Conditions for Setting the DTC
P2227
* Engine running, the ECM detects that the difference between the BARO signal and the calculated BARO is greater than 15 kPa (2.2 psi)
when the vehicle has traveled no more than 0.5 km (0.31 mi) since the last calculated BARO update, or if the difference is greater than 25
kPa (3.6 psi) when the vehicle has traveled greater than 0.5 km (0.31 mi) since the last calculated BARO update.
* Ignition ON, engine OFF, the ECM detects that the BARO pressure is less than 50 kPa (7.3 psi) or greater than 115 kPa (16.7 psi).
P2228
The ECM detects that the BARO sensor voltage is less than 1.95 V for greater than 4 s.
P2229
The ECM detects that the BARO sensor voltage is greater than 4.5 V for greater than 4 s.
P2230
The ECM detects that the difference between the current BARO sensor reading and the previous BARO sensor reading is greater than 10 kPa (1.5
psi) for less than 1 s.
Action Taken When the DTC Sets
DTCs P2227, P2228, P2229, and P2230 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2227, P2228, P2229, and P2230 are Type B DTCs.
Diagnostic Aids
Inspect the inlet port on the B17 BARO sensor for moisture or debris and attempt to dry or clean the inlet, if contaminated.
