U0029 Code: Meaning, Causes, and Symptoms | OBD2 Codes

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.