GM Service Manual Online
For 1990-2009 cars only

Diagnostic Trouble Code (DTC) Identification

DTC

Description

DTC Type

Default Action

P0502

Vehicle Speed Sensor Circuit--Low Input

B

--

P0503

Vehicle Speed Sensor Circuit--Intermittent

B

--

P0719

Brake Switch Circuit--Low Input

D

--

P0724

Brake Switch Circuit--High Input

D

--

P0742

Torque Converter Clutch System --Stuck ON

B

--

P1870

Transmission Component Slipping

B

The PCM will inhibit TCC engagement

DTC Types:

    • A -- Emission related, will turn on the MIL after the first failure
    • B -- Emission related, will turn on the MIL after two consecutive trips with a failure
    • C -- Non-emission related, will turn on the service lamp after the first failure
    • D -- Non-emission related, no lamps