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HOMESERVICE MANUALSCHEVROLET1995CAVALIER LS, 4D SEDAN, 2.2 4REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSANTI-THEFT SYSTEMTESTINGDIAGNOSTIC TROUBLE CODES (DTCS)DTCS 12, 24 & 27, PASSLOCK(R) BAD R-CODE DURING IGNITION
1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4

DTCs 12, 24 & 27, Passlock(R) Bad R-Code During Ignition

1995 Chevrolet Cavalier LS, 4D Sedan, 2.2 4SECTION DTCs 12, 24 & 27, Passlock(R) Bad R-Code During Ignition

Cycle

1) Using scan tool, retrieve DTCs. Clear DTCs. If DTC 14 is set, R-Code has been unprogrammed. See DTC 14, PASSLOCK(R) R-CODE UNPROGRAMMED. If DTC 14 is not set, go to next step.

2) If PASSLOCK(R) lock cylinder has not been replaced, go to next step. If lock cylinder has been replaced, ensure correct lock cylinder has been installed. A vehicle equipped with Vehicle Theft Deterrent (VTD) must use a PASSLOCK(R) lock cylinder. If correct lock cylinder is installed, lock cylinder has an "unlearned" R-Code. Vehicle may go through a long tamper sequence to program new R-Code.

3) Turn ignition switch to RUN position. Disconnect PASSLOCK(R) lock cylinder connector. Using DVOM, check for battery voltage between lock cylinder connector terminals No. 1 (White wire) and No. 2 (Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, check for open or short in White or Black wire in IP harness. If White and Black wires are okay, replace IPC. See article.

4) Using DVOM, measure voltage between PASSLOCK(R) lock cylinder connector terminals No. 2 (Black wire) and No. 3 (Yellow wire). If reading is about 5 volts, replace PASSLOCK(R) lock cylinder. See PASSLOCK(R) LOCK CYLINDER  under REMOVAL & INSTALLATION. If reading is not about 5 volts, check for open or short in Yellow wire in IP harness. If Yellow wire is okay, replace IPC. See appropriate article.

NOTE: If DTC 26 is set, IPC has detected bad timing 3 consecutive times. Vehicle has entered LONG TAMPER MODE.
RENDER: 1.0x

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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.