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 P0A27 or P1A58
| 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 4 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 | Test the BCO Status circuit of the battery cut off switch for a short to voltage above 5.5 volts or an open. Refer to Circuit TestingCircuit Testing
andWiring Repairs
Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
Go to Step 6 | Go to Step 4 |
| 4 | Inspect for poor connections at the harness connector of the battery cut off switch. 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 5 |
| 5 | Replace the battery cut off switch. Refer to Energy Storage Box (ESB) Cut Off Switch Replacement (5.3L Engine w/RPO HP2)
. Did you complete the replacement? |
Go to Step 6 | - |
| 6 |
|
Go to Step 2 | System OK |