Corvette 2005-2008

6.2L V8 VIN W Auto 5

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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: P2135



Throttle Position (TP) Sensor 1-2 Correlation

Possible Causes:



TP sensor low reference circuit for an open/high resistance
 
TP sensor 5-volt reference circuit for a short to ground or an open/high resistance
 
TP sensor 5-volt reference circuit for a short to voltage
 
TP sensor signal circuit terminal F for a short to ground
 
TP sensor 1 signal circuit for a short to ground or an open/high resistance
 
TP sensor 2 signal circuit for a short to voltage
 
TP sensor 2 signal circuit for an open/high resistance.
 
Throttle body has failed
 
ECM 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 (Bank 1 Sensor 2)

Possible Causes:



HO2S low signal circuit for an open/high resistance
 
HO2S high signal circuit for a short to voltage
 
HO2S high signal circuit for a short to ground
 
HO2S high signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P2271



HO2S Signal Stuck Rich (Bank 1 Sensor 2)

Possible Causes:



HO2S low signal circuit for an open/high resistance
 
HO2S high signal circuit for a short to voltage
 
HO2S high signal circuit for a short to ground
 
HO2S high signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P2534



Ignition 1 Switch Circuit Low

Possible Causes:



FPCM relay IGN voltage circuit a short to ground or an open/high resistance
 
FPCM relay has failed
 
FPCM has failed
 

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: P2635



Fuel Pump Flow Performance

Possible Causes:



FPCM relaycircuit for a short to voltage
 
FPCM relaycircuit for a short to ground or an open/high resistance
 
FPCM relay
 

Trouble Code: P2A00



HO2S Performance (Bank 1 Sensor 1)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P2A01



HO2S Performance (Bank 1 Sensor 2)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
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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