P1503 OBD Trouble Code

1 result found

P1503 - GM
Type Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description

Theft Deterrent System Password Incorrect
Cause

Engine cranking, then the PCM received a frequency code that did not match the code it received from the theft deterrent module.

Try also: https://www.obd-codes.com/p1503