Silverado 2500 4WD V8-8.1L VIN G (2006)
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The generator battery control module (GBCM)
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The HVAC control module
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The hybrid control module (HCM), w/HP2
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The inflatable restraint sensing and diagnostic module (SDM)
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The instrument panel cluster (IPC)
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The memory seat module (MSM), w/AN3
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The passenger door module (PDM)
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The powertrain/engine control module (PCM/ECM)
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The radio
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The rear seat audio (RSA) controller, w/UK6
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The rear seat entertainment (RSE) assembly w/U42
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The rear wheel steering control module (RWSCM), w/NYS
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The remote playback device - CD player (CDX), w/U1S
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The transfer case shift control module (TCSCM), w/NP1/NP8
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The transmission control module (TCM), w/M74
3. The following DTCs may be retrieved with a history status, but are not the cause of the present condition.
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U1300
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U1301
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U1305
6. A state of health DTC with a history status may be present along with a U1000 or U1255 code having a current status. This indicates that the
malfunction occurred when the ignition was ON.
7. Data link connector terminals 2 and 5 provide the connection to the class 2 serial data circuit and the signal ground circuit respectively.
10. A poor connection at DLC terminal of the splice pack SP205 would cause this condition but will not set a DTC.
11. An open or a short in the class 2 serial data circuit between the DLC and splice pack SP205 will prevent the scan tool from communicating with
any module. This condition will not set a DTC.
13. This test isolates the BCM class 2 serial data circuits.
16. The BCM detects that the ignition is ON and sends the appropriate power mode message to the other modules. Therefore, the BCM must remain
connected to the DLC for any other module to communicate with the scan tool. This test isolates the splice pack SP207 serial data circuits.
21. This test isolates the rest of the splice pack SP205 serial data circuits.
25. If there are no current DTCs that begin with a "U", the communication malfunction has been repaired.
26. The communication malfunction may have prevented diagnosis of the customer complaint.
