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 MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC B3031: KEY DECODER DEVICE IN LEARN MODETESTING
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
DTC B3031: Key Decoder Device In Learn Mode: Testing
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Testing
WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If circuit is shorted to ground, fuse will blow. Check fuse before performing diagnostics.
- Perform THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS. Go to next step.
- Using scan tool, place BCM in auto learn mode. Go to next step.
- Read DTCs with scan tool. If any DTC are set or reset, go to next step. If DTCs have not reset, go to step 6 .
- Repair appropriate DTC. See BCM DTC DEFINITIONS table under SELF-DIAGNOSTIC SYSTEM. If repair is complete, go to step 6 . If repair is not complete, go to next step.
- Replace BCM. See BODY CONTROL MODULE under REMOVAL & INSTALLATION. After repairs, go to next step.
- Using scan tool, clear DTCs. Go to THEFT DETERRENT DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS.
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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.