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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 44 (ANTI-THEFT SYSTEM)DIAGNOSTIC TESTSDTC B2947: PASSLOCK(R) SENSOR POWER CIRCUIT LOWTESTING
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
DTC B2947: PASSLOCK(R) Sensor Power Circuit Low: Testing
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Testing
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Perform system check. See SYSTEM CHECK under SYSTEM TESTS. Go to next step.
- Ensure ignition is on. Using scan tool, read power circuit voltage. If voltage is less than 10 volts, go to next step. If voltage is 10 volts or more, replace PASSLOCK(R) module. See PASSLOCK(R) MODULE under REMOVAL & INSTALLATION. Go to step 6).
- Turn ignition off. Disconnect PASSLOCK(R) module connector. Turn ignition on. Using scan tool, read power circuit voltage. If voltage is less than 10 volts, go to next step. If voltage is 10 volts or more, replace PASSLOCK(R) sensor. Go to step 6).
- Check for continuity between PASSLOCK(R) module harness connector terminal A5 (Red/White wire) and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground in Red/White wire between PASSLOCK(R) module harness connector terminal A5 and PASSLOCK(R) 3-pin sensor connector C266 terminal B1. Go to step 6).
- Check for poor contact at PASSLOCK(R) module harness connector terminal A5 and PASSLOCK(R) 3-pin sensor connector C266 terminal B1 (Red/White wire). Repair as necessary. If no problem was found, replace PASSLOCK(R) module. See PASSLOCK(R) MODULE under REMOVAL & INSTALLATION. Go to next step.
- Reconnect all connectors and components. Turn ignition on. Using scan tool, clear all DTCs. Perform reprogramming procedure. See PROGRAMMING. Perform 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.