Cobalt 2006-2008, G5 2007

2.0L L4 VIN X Std 4

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Trouble Code: P2125



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2127



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2128



Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2129



Barometric Pressure (BARO) Sensor Circuit High Voltage

Possible Causes:



Moisture in the vent inlet
 
Debris in the vent inlet
 

Trouble Code: P2135



Throttle Position Sensor 1-2 Correlation Error

Possible Causes:



TP1 sensor signal circuit shorted to TP sensor signal 2 circuit
 
TP1 sensor signal circuit is shorted to the low reference circuit
 
TP2 sensor signal circuit is shorted to the low reference circuit
 
Throttle body assembly is damaged or it has failed
 

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2176



Minimum Throttle Position Not Learned

Possible Causes:



Perform the throttle learn procedure
 
Throttle body has failed.
 

Trouble Code: P2227



Barometric Pressure (BARO) Sensor Performance

Possible Causes:



Vacuum leaks
 
BARO sensor low reference circuit for an open/high resistance
 
BARO sensor 5V reference circuit for an open/high resistance or a short to ground
 
BARO sensor 5V reference circuit for a short to voltage
 
BARO sensor signal circuit terminal 3 for a short to voltage
 
BARO sensor signal circuit for an open/high resistance or a short to ground
 
BARO sensor has failed
 

Trouble Code: P2228



Barometric Pressure (BARO) Sensor Circuit Low Voltage

Possible Causes:



Vacuum leaks
 
BARO sensor low reference circuit for an open/high resistance
 
BARO sensor 5V reference circuit for an open/high resistance or a short to ground
 
BARO sensor 5V reference circuit for a short to voltage
 
BARO sensor signal circuit terminal 3 for a short to voltage
 
BARO sensor signal circuit for an open/high resistance or a short to ground
 
BARO sensor has failed
 

Trouble Code: P2229



Barometric Pressure (BARO) Sensor Circuit High Voltage

Possible Causes:



Vacuum leaks
 
BARO sensor low reference circuit for an open/high resistance
 
BARO sensor 5V reference circuit for an open/high resistance or a short to ground
 
BARO sensor 5V reference circuit for a short to voltage
 
BARO sensor signal circuit terminal 3 for a short to voltage
 
BARO sensor signal circuit for an open/high resistance or a short to ground
 
BARO sensor has failed
 

Trouble Code: P2270



HO2S Signal Stuck Lean Sensor 2

Possible Causes:



HO2S signal circuit open/high resistance
 
HO2S signal circuit short to voltage
 
HO2S signal circuit open/high resistance
 
HO2S is damaged
 
ECM has failed
 

Trouble Code: P2271



HO2S Signal Stuck Rich Sensor 2

Possible Causes:



HO2S signal circuit open/high resistance
 
HO2S signal circuit short to voltage
 
HO2S signal circuit open/high resistance
 
HO2S is damaged
 
ECM has failed
 

Trouble Code: P2301



Ignition Coil 1 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2304



Ignition Coil 2 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2307



Ignition Coil 3 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2310



Ignition Coil 4 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2544



Transmission Torque Request Circuit

Possible Causes:



If DTC P0604 is set, replace the ECM.
 
If DTC P0604 is not set, replace the TCM.
 

Trouble Code: P2610



Control Module Ignition OFF Timer Performance

Possible Causes:



Voltage and ground inputs to the ECM
 
If DTC P0602 is set, attempt to program the ECM before replacing the ECM. If DTC P0602 resets, replace the ECM.
 

Trouble Code: P2A00



HO2S Performance Sensor 1

Possible Causes:



HO2S signal circuit open/high resistance
 
HO2S signal circuit short to voltage
 
HO2S signal circuit open/high resistance
 
HO2S is damaged
 
ECM has failed
 

Trouble Code: P2A01



HO2S Performance Sensor 2

Possible Causes:



Collapsed air intake duct
 
Restricted air filter element
 
Excessive fuel in the crankcase
 
Fuel contamination
 
Rich injectors
 
Engine mechanical conditions
 
Restricted exhaust system
 
Faulty HO2S
 
ECM has failed
 

Trouble Code: U1000



Class 2 Communication Malfunction

Possible Causes:



Class 2 circuit is open, shorted to ground or shorted to power
 
ECM ignition power circuit(s) has a high resistance condition
 
ECM main ground circuit(s) has a high resistance condition
 
SDM (module) could be shorted pulling the voltage low
 

Trouble Code: U1016



No Communication With Powertrain Control Module

Possible Causes:



ECM Class 2 circuit is open, shorted to ground or to B+
 
ECM ignition power circuit(s) has a high resistance condition
 
ECM main ground circuit(s) has a high resistance condition
 
ECM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1048



No Communication With Rear Wheel Steering Control Module

Possible Causes:



RWSCM Class 2 circuit is open, shorted to ground or to B+
 
RWSCM ignition power circuit has a high resistance condition
 
RESCM main ground circuit(s) has a high resistance condition
 
RESCM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1064



No Communication With Body Control Module

Possible Causes:



BCM Class 2 circuit is open, shorted to ground or to B+
 
BCM ignition power circuit has a high resistance condition
 
BCM main ground circuit(s) has a high resistance condition
 
BCM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1088



No Communication With SDM (Restraint Module)

Possible Causes:



SDM Class 2 circuit is open, shorted to ground or to B+
 
SDM ignition power circuit has a high resistance condition
 
SDM main ground circuit(s) has a high resistance condition
 
SDM (module) may have failed and is pulling the circuit low
 

Trouble Code: U1096



No Communication With Instrument Panel Cluster

Possible Causes:



IPC Class 2 circuit is open, shorted to ground or to B+
 
IPC ignition power circuit has a high resistance condition
 
IPC main ground circuit(s) has a high resistance condition
 
IPC (module) may have failed and is pulling the circuit low
 

Trouble Code: U1097



No Communication With Driver Information Center

Possible Causes:



DIC Class 2 circuit is open, shorted to ground or to B+
 
DIC ignition power circuit has a high resistance condition
 
DIC main ground circuit(s) has a high resistance condition
 
DIC (module) may have failed and is pulling the circuit low
 

Trouble Code: U1151



No Communication With Vehicle Interface Unit

Possible Causes:



VIU Class 2 circuit is open, shorted to ground or to B+
 
VIU ignition power circuit has a high resistance condition
 
VIU main ground circuit(s) has a high resistance condition
 
VIU (module) may have failed and is pulling the circuit low
 

Trouble Code: U1152



No Communication With HVAC Control Module

Possible Causes:



HVAC Class 2 circuit is open, shorted to ground or to B+
 
HVAC ignition power circuit has a high resistance condition
 
HVAC main ground circuit(s) has a high resistance condition
 
HVAC (module) may have failed and is pulling the circuit low
 

Trouble Code: U1255



Class 2 Communications Malfunction

Possible Causes:



Class 2 circuit is open, shorted to ground or shorted to power
 
ECM ignition power circuit(s) has a high resistance condition
 
ECM main ground circuit(s) has a high resistance condition
 

Trouble Code: U1300



Class 2 Circuit Short to Ground

Possible Causes:



Class 2 serial data line was in a low state for 3 seconds due to a short to sensor ground or chassis ground
 
One or more modules on the Class 2 line has a short to ground
 

Trouble Code: U1301



Class 2 Circuit Short to Battery

Possible Causes:



Class 2 serial data line was in a high state for 3 seconds due to a short to VREF or system power
 
One or more modules on Class 2 line has an short to power
 

Trouble Code: U1305



Class 2 Data Link High or Low

Possible Causes:



Class 2 serial data line has either a high or low voltage condition on the circuit, and the module cannot identify the fault
 
One or more modules on Class 2 line has an short to power
 
One or more modules on the Class 2 line has a short to ground
 

 
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