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 B2957: PASSLOCK(R) SENSOR DATA CIRCUIT LOWTESTING
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
DTC B2957: PASSLOCK(R) Sensor Data 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.
- Turn ignition on. Using scan tool, read PASSLOCK(R) sensor signal voltage. If voltage is less than .8 volt, go to next step. If voltage is .8 volt or more, replace PASSLOCK(R) module. See PASSLOCK(R) MODULE under REMOVAL & INSTALLATION. Go to step 5).
- Turn ignition off. Disconnect PASSLOCK(R) 3-pin sensor connector C266. Turn ignition on. Using scan tool, read PASSLOCK(R) sensor signal voltage. If voltage is less than .8 volt, go to next step. If voltage is .8 volt or more, replace PASSLOCK(R) sensor. Go to step 5).
- Turn ignition off. Disconnect PASSLOCK(R) module connector. Check for continuity between PASSLOCK(R) module harness connector terminal B7 (Yellow wire) and ground. If continuity does not exist, check connector contacts. Repair as necessary and recheck. If contacts are okay, replace PASSLOCK(R) module. See PASSLOCK(R) MODULE under REMOVAL & INSTALLATION. Go to next step. If continuity exists, repair short to ground in Yellow wire between PASS-LOCK(R) module harness connector terminal B7 and PASSLOCK(R) 3-pin sensor connector C266 terminal D3. 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.