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.
2002 Pontiac Firebird Formula, AutomaticFACTORY OEM SERVICE PROCEDURE
Body Control Module System Diagnostic System Check
- Retrieve and display DTCs by entering Body Control Module (BCM) using SECURITY indicator diagnostic mode. See RETRIEVING BODY CONTROL MODULE DIAGNOSTIC TROUBLE CODES . If diagnostic mode is entered and DTCs are retrieved, go to next step. If diagnostic mode cannot be entered, perform TEST C: CANNOT ENTER BODY CONTROL MODULE DIAGNOSTICS under SYSTEM TESTS in BODY CONTROL MODULES - CAMARO & FIREBIRD article.
- If both DTCs 12 and 55 are retrieved, go to next step. If DTCs 12 and 55 are not retrieved, perform TEST C: CANNOT ENTER BODY CONTROL MODULE DIAGNOSTICS under SYSTEM TESTS in BODY CONTROL MODULES - CAMARO & FIREBIRD articles.
- If both DTC 25 and 35 are not retrieved, go to next step. If both DTCs 25 and 35 are retrieved, go to step 5 .
- If DTC 35 is retrieved with DTC 25, go to next step. If DTC 35 is retrieved without DTC 25, perform appropriate test. See ANTI-THEFT SYSTEMS - CAMARO & FIREBIRD article.
- If other DTCs are retrieved other than DTC 12, 25/35 and 55, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in BODY CONTROL MODULES - CAMARO & FIREBIRD article. If no DTCs are retrieved other than DTC 12, 25/35 and 55, perform diagnostic system check for malfunctioning system. If door system is malfunctioning, see DOOR SYSTEMS DIAGNOSTIC SYSTEM CHECK . If retained accessory system is malfunctioning, see RETAINED ACCESSORY POWER SYSTEM DIAGNOSTIC SYSTEM CHECK . For diagnostic system checks not included in this article, see BODY CONTROL MODULES - CAMARO & FIREBIRD article.
Factory Service Tools
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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.
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