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.
DTC C1242: BPMV Pump Motor Circuit Open
2000 Buick Century CustomSECTION DTC C1242: BPMV Pump Motor Circuit Open
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
- Turn ignition off. Disconnect EBCM harness connector. Connect Universal Pinout Box (J 39700) using Cable Adapter (J 39700-99) to EBCM harness connector only. Using a DVOM, check resistance between pump motor ground circuit of universal pinout box and a known-good ground. If resistance is 0-2 ohms, go to step 4 . If resistance is not 0-2 ohms, go to next step.
- Repair open or high resistance in pump motor ground circuit. After repairs, go to step 9 .
- Remove EBCM from BPMV. Check EBCM-to-BPMV connector for damage, corrosion, poor terminal contact, or presence of brake fluid. If connector is okay and cavity is free of brake fluid, go to step 6 . If a problem is found, go to next step.
- If connector corrosion or damage is evident, replace BPMV and/or EBCM as necessary. If brake fluid is present, replace both BPMV and EBCM. After repairs, go to step 9 .
- Check resistance between pump motor terminals using Connector Test Adapter Kit (J 35616-A). Zero DVOM first before proceeding with this test. If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 8 .
- Replace EBCM. After replacing EBCM, go to step 9 .
- Replace BPMV. After replacing BPMV, go to step 9.
- Using scan tool, clear DTCs. Recheck DTCs. If DTC resets, go to step 2 . If DTC does not reset, system is okay.
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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.