Avalanche, Sierra, Silverado, C&K Series, 1999-2005

6.6L V8 VIN 1 Auto 5

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Trouble Code: P2227



BARO Sensor Signal Range/Performance

Possible Causes:



BARO sensor signal circuit is shorted to VREF
 
BARO sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P2228



BARO Sensor Circuit Low Input

Possible Causes:



BARO sensor signal circuit is open or shorted to ground
 
BARO sensor is damaged or it has failed
 
ECM has failed
 

Trouble Code: P2279



Air Intake Leak Detected

Possible Causes:



Air Intake Duct is leaking somewhere after the MAF sensor
 
Check for an air leak in Air Induction system after the MAF sensor, in the engine intake gaskets, or the EGR tower gasket
 

Trouble Code: P2610



Powertrain Control Module Internal Malfunction

Possible Causes:



Clear the codes and then recheck for this trouble code. If the same code resets, the PCM is damaged and must be replaced (and the new PCM must be programmed) to repair this code.
 

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: U1800



CAN Bus Messages Missing From FICD

Possible Causes:



Modules that communicate on the SAE J1939 CAN system are wired parallel to each other until the respective circuits are spliced together at the ECM. An open in the CAN circuit of one module will not affect other modules. A short to ground or short to power affects all modules no matter where the failure occurs.
 
FICD power and/or ground circuit are open or shorted
 
FICD (module) has failed
 
ECM or TCM has failed
 

Trouble Code: U2104



CAN Bus Messages Missing From FICD & TCM

Possible Causes:



Modules that communicate on the SAE J1939 CAN system are wired parallel to each other until the respective circuits are spliced together at the ECM. An open in the CAN circuit of one module will not affect other modules. A short to ground or short to power affects all modules no matter where the failure occurs.
 
FICD power and/or ground circuit are open or shorted
 
FICD (module) has failed
 
ECM or TCM has failed
 

Trouble Code: U2106



CAN Bus Messages Missing From TCM

Possible Causes:



Modules that communicate on the SAE J1939 CAN system are wired parallel to each other until the respective circuits are spliced together at the ECM. An open in the CAN circuit of one module will not affect other modules. A short to ground or short to power affects all modules no matter where the failure occurs.
 
FICD power and/or ground circuit are open or shorted
 
FICD (module) has failed
 
ECM or TCM has failed
 

 
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