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.

1998 Pontiac Firebird Formula, AutomaticFACTORY OEM SERVICE PROCEDURE

BCM DTC Definitions

BCM DTC DEFINITIONS

Code No.

Circuit Affected

Diagnostic System Check

21/31

Courtesy Lights Feed (Circuit Shorted To Ground)

22/32

Courtesy Lights Return (Circuit Shorted To Battery)

23/33

Retained Accessory Power (Circuit Shorted To Ground Or Battery)

24/34

Fasten Seat Belt Indicator (Circuit Shorted To Ground Or Battery)

25/35

Security LED Present (With Theft Deterrent Only)

41 ⁽¹⁾

Last Transmitter Message Received Valid

42 ⁽¹⁾

Last Transmitter Message Received Had Invalid ID

43 ⁽¹⁾

Last Transmitter Message Received Had Sumcheck Error

44 ⁽¹⁾

Last Transmitter Message Received Had Encryption Error

45 ⁽¹⁾

Receiver Processing Currently In 20-Second Lock-Out

Begin Configuration Display

⁽¹⁾	This is a remote keyless entry system code only. Codes are automatically cleared after they are displayed. To display codes again, a transmitter button must be pushed again the next time BCM diagnostic mode is entered.

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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