Silverado 2008

4.3L V6 VIN X Auto 25

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Trouble Code: U0020



Low Speed CAN Communication Bus Performance

Possible Causes:



Control modules the vehicle is equipped with
 
Control modules B+, ignition, ground, communication enable and serial data circuit terminals
 
Control module locations on the low and high speed GMLAN serial data circuits
 

Trouble Code: U0020 00



Low Speed CAN Communication Bus Performance

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0073



Control Module Communication Bus Off

Possible Causes:



Control modules the vehicle is equipped with
 
Control module locations on the low speed GMLAN serial data circuit
 
Each control module's low speed GMLAN serial data circuit terminals
 
Control modules the vehicle is equipped with
 
High speed GMLAN serial data circuit terminating resistors
 
Control module locations on the high speed GMLAN serial data circuits
 
Each control module's high speed GMLAN serial data circuit terminals
 

Trouble Code: U0073 00



Control Module Communication Bus Off

Possible Causes:



The control module setting the DTC has attempted to establish communications on the serial data circuits more than 3 times in 5 seconds.
 

Trouble Code: U0073 71



ECU HS Bus Off

Possible Causes:



The control module setting the DTC has attempted to establish communications on the serial data circuits more than 3 times in 5 seconds.
 

Trouble Code: U0073 72



ECU LS Bus Off

Possible Causes:



The control module setting the DTC has attempted to establish communications on the serial data circuits more than 3 times in 5 seconds.
 

Trouble Code: U0100 00



Lost Communication With ECM/PCM

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0100 75



Lost Communication With ECM/PCM

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0100 7F



Lost Communication With ECM/PCM

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0101 00



Lost Communication With TCM

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0102 00



Lost Communication With Transfer Case Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0104 00



Lost Communication With Cruise Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0104 7F



Lost Communication With Cruise Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0106 00



Lost Communication With Glow Plug Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0109 00



Lost Communication With Fuel Pump Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0117 00



Lost Communication With Electrical PTO Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0121 00



Lost Communication With Anti-Lock Brake System (ABS) Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0122 00



Lost Communication With Vehicle Dynamics Control Module (ESCM)

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0126 00



Lost Communication With Steering Angle Sensor

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0131 00



Lost Communication With Power Steering Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0132 00



Lost Communication With Ride Level Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0134 00



Lost Communication With Power Steering Control Module - Rear

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0136 00



Lost Communication With Differential Control Module - Rear

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0137 00



Lost Communication With Trailer Brake Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0140 00



Lost Communication With Body Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0141 00



Lost Communication With Body Control Module A

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0151 00



Lost Communication With Restraints Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0151 71



Lost Communication With Restraints Control Module Invalid Serial Data Received

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0151 7F



Lost Communication With Restraints Control Module Erratic

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0155 00



Lost Communication With Instrument Panel Cluster (IPC) Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0156 00



Lost Communication With Information Center A (DIC)

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0157 00



Lost Communication With Information Center B (DID)

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0158 00



Lost Communication With Head Up Display

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0159 00



Lost Communication With Parking Assist Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0160 00



Lost Communication With Audible Alert Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0164 00



Lost Communication With HVAC Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0165 00



Lost Communication With HVAC Control Module - Rear

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0168 00



Lost Communication With Vehicle Security Control Module

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0170 00



Lost Communication With Restraints System Sensor A (PPS)

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

Trouble Code: U0172 00



Lost Communication With Rollover Sensor

Possible Causes:



A supervised periodic message that includes the transmitter module availability has not been received.
 

 
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