GM Service Manual Online
For 1990-2009 cars only

The following DTCs will affect theft deterrent and PASS-Key® performance, always diagnosis these DTCs before attempting to diagnose the theft deterrent or PASS-Key® systems:

DTC

Description

Type

B2236

Left Door Lock Switch Fault

LDCM

B2237

Right Door Lock Switch Fault

RDCM

B2252

Key Cylinder Switch Fault

LDCM

B2253

Key Cylinder Switch Fault

RDCM

B2587

Column Lock/Unlock Drive A

BCM

B2588

Column Lock/Unlock Drive A

BCM

B2592

Column Lock/Unlock Drive B

BCM

B2593

Column Lock/Unlock Drive B

BCM

B2721

PASS-Key® Detection Circuit (Out of Range)

BCM

B2722

PASS-Key® Detection Circuit (Short to Ground)

BCM

B2723

PASS-Key® Detection Circuit (Short to Voltage or Open)

BCM

B2735

PASS-Key® Programming Mode Active

BCM

U1016

Loss of Communications with the PCM

BCM

P1626

Theft Deterrent System Fuel Enable CKT

PCM

P1630

Theft Deterrent in Learn Mode

PCM

P1631

Theft Deterrent Password Incorrect

PCM