PASS-Key Diagnosis

PASS-Key system interfaces PCM and starter with a power source, decoder module, starter enable relay, ignition switch and instrument cluster. Before replacing PASS-Key module, check system for following common problems.

• Check ignition key pellet sensing contacts in ignition lock cylinder. Look into cylinder lock. If contacts are damaged, replace cylinder lock.
• Check PASS-Key, PCM and GAGES fuses.
• Check SECURITY indicator bulb in instrument panel.
• A defective resistor pellet within ignition key or incorrect resistance value of key (15 different assigned values) will cause vehicle not to start. Key must be correct electrically and mechanically.

If incorrect key is used to try to start vehicle, decoder will not allow vehicle to start for 2-4 minutes, even if after correct key is inserted.

Fig 1: PCM Code P058 Schematic - PASS-Key Fuel Enable Problem

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code P058 Flow Chart - PASS-Key Fuel Enable Problem

Courtesy of GENERAL MOTORS CORP.