CTS 2003-2005

3.2L V6 VIN N Auto 6

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Trouble Code: P2107



Throttle Air Control System Malfunction

Possible Causes:



TAC motor control circuit (one or more) is open, shorted to ground or to power (B+)
 
Throttle valves binding open or closed, or moving too freely
 
Throttle body connector is damaged, open or shorted
 
Throttle body assembly has failed, or the PCM has failed
 

Trouble Code: P2110



IMRC Solenoid Control Circuit High Input

Possible Causes:



IMRC solenoid control connector is damaged or shorted to B+
 
IMRC solenoid control circuit is open or shorted to power
 
IMRC solenoid is damaged or it has failed
 
PCM has failed
 

Trouble Code: P2119



Throttle Air Control System Malfunction

Possible Causes:



TAC motor control circuit (one or more) is open or shorted (B+)
 
TAC motor control circuit (one or more) is shorted to ground
 
Throttle valves binding open or closed, or moving too freely
 
Throttle body connector is damaged, open or shorted
 
Throttle body assembly is damaged or it has failed
 
PCM has failed
 

Trouble Code: P2122



Accelerator Pedal Position Sensor 1 Circuit Low Input

Possible Causes:



APP1 sensor low reference circuit open or has high resistance
 
APP1 sensor signal circuit is open, shorted to ground
 
APP1 sensor signal circuit is shorted to low reference circuit
 
APP1 5v VREF circuit is open or shorted to ground
 
APP1 sensor is damaged or it has failed
 
MAF sensor or FTP sensor 5v VREF circuit shorted to ground
 
PCM has failed
 

Trouble Code: P2123



Accelerator Pedal Position Sensor 1 Circuit High Input

Possible Causes:



APP1 sensor low reference circuit open or has high resistance
 
APP1 sensor signal circuit is open, shorted to low reference or shorted to power
 
APP1 5v VREF circuit is open or shorted to power
 
APP1 sensor is damaged or it has failed
 
MAF sensor or FTP sensor 5v VREF circuit shorted to power
 
PCM has failed
 

Trouble Code: P2127



Accelerator Pedal Position Sensor 2 Circuit Low Input

Possible Causes:



APP2 sensor low reference circuit open or has high resistance
 
APP2 sensor signal circuit is open, shorted to ground
 
APP2 sensor signal circuit is shorted to low reference circuit
 
APP2 5v VREF circuit is open or shorted to ground
 
APP2 sensor is damaged or it has failed
 
TP Sensor 5v VREF circuit shorted to ground
 
PCM has failed
 

Trouble Code: P2128



Accelerator Pedal Position Sensor 2 Circuit High Input

Possible Causes:



APP2 sensor low reference circuit open or has high resistance
 
APP2 sensor signal circuit is open, shorted to power
 
APP2 sensor signal circuit is shorted to low reference circuit
 
APP2 5v VREF circuit is open or shorted to power
 
APP2 sensor is damaged or it has failed
 
TP Sensor 5v VREF circuit shorted to power
 
PCM has failed
 

Trouble Code: P2135



Throttle Position Sensor 1-2 Correlation Error

Possible Causes:



TP Sensor 1 signal, low reference or 5v VREF circuit is open
 
TP Sensor 2 signal, low reference or 5v VREF circuit is open
 
TP Sensor 1 signal circuit is shorted to the TP2 signal circuit
 
Throttle body assembly is damaged or it has failed
 

Trouble Code: P2138



Accelerator Pedal Position Sensor 1-2 Correlation Error

Possible Causes:



APP Sensor 1 signal circuit is shorted to the APP2 signal circuit
 
APP sensor is damaged or it has failed
 

Trouble Code: P2176



Throttle Position Sensor Minimum Position Not Detected

Possible Causes:



TAC motor control circuit (one or more) open or shorted to B+
 
TAC motor control circuit (one or more) shorted to ground
 
Throttle valves not at the "rest" position
 
Throttle valve are binding open, or are binding closed
 
Throttle valves moving open or closed without spring pressure
 
TP connector is damaged, open or shorted
 
Throttle body assembly is damaged or it has failed
 
PCM has failed
 

Trouble Code: P2500



Generator Turn "On" Circuit Low Input

Possible Causes:



Generator connector is damaged or shorted to ground
 
Generator turn "on" signal circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P2501



Generator Turn "On" Circuit High Input

Possible Causes:



Generator connector is damaged or shorted to power
 
Generator turn "on" signal circuit is shorted to system power
 
PCM has failed
 

Trouble Code: U1000



Class 2 Communication Malfunction

Possible Causes:



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



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

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
 

Trouble Code: U2105



TCM - No Communication With Engine Control Module

Possible Causes:



Perform the Diagnostic System Check for Powertrain Module
 
Test the main power and ground circuits to the PCM
 
Check the CAN serial data circuit to the TCM
 
TCM may have failed
 

 
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