DTC P300B 2019 Chevrolet Bolt EV | Bolt EV Service Manual 11621020 | Document ID: 4573166 DTC P300B Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors Hybrid/EV Battery DC Charging Output Current Performance Circuit/System Description The hybrid/EV battery contains 4 high voltage contactors for normal operation and regular (AC) charging, and 1 module. In vehicles with DC charging capability, there are two additional DC contactors that are housed in the battery charger - DC. The high voltage contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 6 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, AC charge positive high voltage contactor, precharge contactor, DC positive contactor, and DC negative contactor. The 1 module is the hybrid/EV battery pack coolant heater module. The contactors and module close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/module. Ground is provided through the case ground and chassis. The hybrid/EV powertrain control module 2 measures internal voltages, currents, and temperatures within the battery charger - DC and charge receptacle and verifies they are within the proper range. Conditions for Running the DTC The vehicle 12 V battery system voltage is greater than 10.2 V. The Charge Control Mode is Constant current or Constant Voltage. The Battery Charger DC positive and negative contactors are closed. The Battery Pack main positive, main negative, and multifunction contactors are closed. The Charge Power Level is DC. DTCs P0AC1, P0AC2 and P1EBA are not set. Conditions for Setting the DTC The percent current deviation is greater than the fail threshold for 80% of the samples in a 10 s window. The fail thresholds are as follows: 100% current deviation when the commanded current is less than 5 A 60% current deviation when the commanded current is greater than or equal to 5 A and less than 20 A 50% current deviation when the commanded current is greater than or equal to 20 A and less than 40 A 30% current deviation when the commanded current is greater than or equal to 40 A Action Taken When the DTC Sets DTC P300B is a type C DTC. Conditions for Clearing the DTC DTC P300B is a type C DTC. Diagnostic Aids Current deviation is defined as actual current minus commanded current. Percent current deviation is defined as current deviation divided by commanded current multiplied by 100. For example, if commanded current is 10 A and actual current is 18 A, the current deviation is 8 A and the percent current deviation is 80%. An 80% current deviation is greater than the 60% fail threshold for the 5 A to 20 A commanded current range. Reference Information Schematic Reference Plug-In Charging Schematics Connector End View Reference Master Electrical Component List Description and Operation Plug-In Charging System Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References for scan tool information Circuit/System Verification © 2021 General Motors. All rights reserved. 1. Verify that DTC P300B does not set while operating the vehicle within the Conditions for Running the DTC. ⇒ If DTC P300B is set Advise the customer to report a problem with the DC fast charge station. ⇓ If DTC P300B is not set 2. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. © 2021 General Motors. All rights reserved.