2010 Cadillac Truck SRX FWD V6-3.0L Page 2014
The barometric pressure (BARO) sensor is integral to the throttle inlet absolute pressure sensor and responds to changes in altitude and atmospheric
conditions. This gives the 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
* DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516,
P2135, P2228, or P2229 is not set.
* The engine is running.
OR
* DTC P0106, P0107, P0108, P2228, P2229, or P2230 is not set and 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
* DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P1516,
P2135, P2228, or P2229 is not set.
* The engine is running.
* DTC P2230 runs continuously when the above conditions are met.
Conditions for Setting the DTC
P2227
* The engine is running.
* The ECM detects that the difference between the BARO signal and the calculated BARO is greater than 15 kPa (2.2 psi) if the vehicle has
traveled at most 0.5 km (0.31 mi) since the last calculated BARO update, or the ECM detects that the difference between the BARO signal
and the calculated BARO is greater than 25 kPa (3.6 psi) if the vehicle has traveled greater than 0.5 km (0.31 mi) since the last calculated
BARO update.
OR
* 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).
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 BARO sensor for moisture or debris and attempt to dry or clean the inlet, if contaminated.
Reference Information
Schematic Reference
Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
