P1EAB – Battery Energy Control Module Hybrid/EV Battery Cell High Voltage

P1EAB Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1EAB Possible Causes

Faulty Hybrid Powertrain Control Module 2,Hybrid Powertrain Control Module 2 harness is open or shorted,Hybrid Powertrain Control Module 2 circuit poor electrical connection

P1EAB Description

The 2nd protection is a redundant method to monitor cell group overvoltage. The four hybrid/EV battery interface control modules independently read and test each cell group. The 2nd protection circuit fault is the actual hardwire signal from the four hybrid/EV battery interface control modules to the hybrid/EV battery energy control module and terminating in the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 diagnoses this line to determine when a cell group overvoltage condition exists. The 2nd protection self test diagnostic is used to check the signal circuit. The hybrid/EV battery energy control module performs this test, once, every power down cycle. When run/crank input signal transitions low and after a calibrated delay, the hybrid/EV battery energy control module informs the hybrid/EV powertrain control module 2, via serial data communication bus that it is about to run the diagnostics on the 2nd protection circuit. The hybrid/EV battery energy control module then proceeds to command, via internal serial data, each hybrid/EV battery interface control module to run the check on its hardwire output. Each of the four hybrid/EV battery interface control modules pulls the signal circuit low and releases it, in sequence. If any pulses are missing, the hybrid/EV battery energy control module is able to diagnose which hybrid/EV battery interface control module(s) has a fault and sets a related fault and sends this information to the hybrid/EV powertrain control module 2 on the serial data