U0029 – Vehicle Communication Bus A Performance

U0029 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

U0029 Possible Causes

Reprogram Powertrain Control Module (PCM),Faulty Powertrain Control Module (PCM),Powertrain Control Module (PCM) harness is open or shorted,Powertrain Control Module (PCM) circuit poor electrical connection

U0029 Description

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (CANH and CANL). When the Powertrain Control Module (PCM) does not receive the signals via the CAN lines for a set of more, the PCM detects a malfunction and sets the U0029 code.