U0253 – Lost Communication With Accessory Protocol Interface Module

U0253 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

U0253 Possible Causes

Faulty Accessory Protocol Interface Module (APIM),Accessory Protocol Interface Module (APIM) harness is open or shorted,Accessory Protocol Interface Module (APIM) circuit poor electrical connection

U0253 Description

The Accessory Protocol Interface Module (APIM) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN). The Powertrain Control Module (PCM) monitors the APIM. The PCM sets the OBDII code when the APIM is not to factory specifications.