Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 723 (BATTERY, CHARGING SYSTEM & STARTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCHARGE INDICATOR ALWAYS ON
1999 GMC Forward Control 5.7 R, Automatic
Charge Indicator Always On
1999 GMC Forward Control 5.7 R, AutomaticSECTION Charge Indicator Always On
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Charge Indicator Always On
| Step | Action | Value | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Starting and Charging Schematics | ||||
| 1 | Did you perform the Engine Electrical Diagnostic System Check? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Electrical |
| 2 | Start the engine. Does the Charge System Fault message remain ON? |
- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 |
|
11.0-15.5 Volts | Go to Step 4 | Go to Charging System Test |
| 4 |
|
- | Go to Step 5 | Go to Step 7 |
| 5 | Inspect for poor connections at the harness connector of the IPC. 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 9 | Go to Step 6 |
| 6 | Replace the instrument panel cluster. Refer to Instrument Panel Cluster (IPC) Replacement
in Instrument Panel, Gages and Console. Did you complete the replacement? |
- | Go to Step 9 | - |
| 7 | Inspect for poor connections at the PCM harness connector. 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 9 | Go to Step 8 |
| 8 |
IMPORTANT:
Perform the set up procedures for the PCM. Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
in Engine Controls - 5.7L.Did you complete the replacement? |
- | Go to Step 9 | - |
| 9 | Operate the system for which the symptom occurred. Did you correct the condition? |
- | System OK | Go to Step 2 |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.