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 6 (BODY CONTROL MODULES)DIAGNOSTIC TESTSDTC B2747: PERFORMANCE SHIFT SWITCH CIRCUIT (SHORT TO GROUND OR OPEN)TESTING
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
DTC B2747: Performance Shift Switch Circuit (Short To Ground Or Open): Testing
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Testing
WARNING: This page is about a different car, the 1999 Buick Regal and 1999 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- If BCM diagnostic system check was performed, go to next step. If BCM diagnostic system check was not performed, go to BCM DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS.
- Turn ignition off. Disconnect BCM Pink 24-pin connector C2. Turn ignition on. Connect test light between BCM connector C2, terminal A11 (Dark Blue wire) and battery positive voltage. See WIRING DIAGRAMS . See Figure . If test light comes on, go to next step. If test light does not come on, go to step 4 .
- With test light connected as in previous step, turn ignition off. Disconnect electronic traction control switch electrical connectors. If test light comes on, go to next step. If test light does not come on, go to step 6 .
- Turn ignition off. Reconnect all disconnected connectors and components. Turn ignition on. Using scan tool, clear DTCs. Wait 5 minutes. Recheck for DTCs. If DTC B2747 resets, go to step 7 . If DTC B2747 does not reset, go to step 8 .
- Repair short to ground in Brown/White wire between electronic traction control switch and BCM connector C2. Go to step 9 .
- Replace electronic traction control switch. Go to step 9 .
- Replace BCM. See BODY CONTROL MODULE (BCM) under REMOVAL & INSTALLATION. Reprogram BCM. See NEW BCM SETUP under PROGRAMMING. Go to step 9 .
- System is operating properly at this time. See DIAGNOSTIC AIDS . After any repairs are made, go to next step.
- Turn ignition off. Reinstall all components and connectors. Turn ignition on. Using scan tool, clear DTCs. Check for DTCs. If any DTCs are current, perform BCM DIAGNOSTIC SYSTEM CHECK under SYSTEM TESTS. If no DTCs are current, system is operating properly.
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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.