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 MANUALSPONTIAC1998FIREBIRD V8-5.7L VIN GREPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONINTERMITTENT AND HISTORY DTCS
1998 Pontiac Firebird V8-5.7L VIN G
Intermittent and History DTCs
1998 Pontiac Firebird V8-5.7L VIN GSECTION Intermittent and History DTCs
History DTCs are codes that indicate that the BCM detected a fault which has disappeared.
Any DTC that begins with the digit 3 is a history DTC.
The fault will be stored as a history code under either of the following conditions:
^ The fault is an intermittent failure.
^ The fault exists in a system which is not currently being operated.
If you cannot determine the cause of the failure through visual inspection, complete the following steps:
1. Connect a DVM to the suspected circuit.
2. Drive the vehicle.
3. Observe the readings. An abnormal voltage or resistance reading when the failure occurs indicates that the condition may be in the suspected circuit.
Any DTC that begins with the digit 3 is a history DTC.
The fault will be stored as a history code under either of the following conditions:
^ The fault is an intermittent failure.
^ The fault exists in a system which is not currently being operated.
If you cannot determine the cause of the failure through visual inspection, complete the following steps:
1. Connect a DVM to the suspected circuit.
2. Drive the vehicle.
3. Observe the readings. An abnormal voltage or resistance reading when the failure occurs indicates that the condition may be in the suspected circuit.
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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.