Conditions for Clearing the DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- A current DTC Last Test Failed clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Clear the DTC with a scan tool.
DTC B139A, DTC B139B, DTC B139C, DTC B139D, DTC B139E, DTC B139F, DTC B140A, DTC B140B or DTC B140C
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Starting and Charging Schematics (Except HP2)
or Starting and Charging Schematics (HP2) Connector End View Reference: Engine Electrical Connector End Views |
|||
| 1 | Was the Engine Electrical Diagnostic System Check performed? | Go to Step 2 | Go to Diagnostic System Check - Engine Electrical |
| 2 |
|
Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 | Inspect for poor connections at the 120 volt, orange harness connector of the starter/generator control module SGCM and auxiliary power outlets (APO). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 6 | Go to Step 4 |
| 4 | With a DMM test the circuits of the 120 volt, orange harness for an open or short to ground. Refer to Circuit Testing
andWiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 6 | Go to Step 5 |
| 5 |
IMPORTANT:
Always perform the setup procedure for the SGCM. Refer to Service Programming System (SPS)
in Service Programing. Replace the SGCM. Refer to Starter/Generator Control Module (SGCM) Replacement (5.3L Engine w/RPO HP2)
in Engine Electrical.Did you complete the replacement? |
Go to Step 6 | - |
| 6 |
|
Go to Step 2 | System OK |