P0A8B

High-Voltage Traction Battery

Pinpoint Test F: DTCs P0A8B:64

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

With the ignition in the ON position and the engine running or OFF (the engine must have started at least once after the ignition was cycled to ON), the Electronically Controlled Continuously Variable Transmission (eCVT) engages the generator (also in the eCVT (Electronically Controlled Continuously Variable Transmission)), which charges the High Voltage Traction Battery (HVTB) and supplies high-voltage to the DC to DC Converter Control Module (DC/DC). The DC/DC (DC to DC Converter Control Module) charges the low-voltage battery which is used to power the PCM and low voltage components. The DC/DC (DC to DC Converter Control Module) steps the high voltage down to 12 volts (operating range of 13.3-14.7 volts). This DTC may indicate a low state-of-charge in the 12-volt battery or a Battery Energy Control Module (BECM) fault. If the 12-volt battery has recently had the terminals disconnected/cleaned or if a new 12-volt battery has been recently installed, this DTC will also be set. When a fault is present, the system will attempt to continue normal operation. There is no warning indicator for this fault.

- DTC P0A8B:64 (14 Volt Power Module System Voltage: Signal Plausibility)- Fault sets when voltage less than 2.5 volts or greater than 25 volts on the BECM (Battery Energy Control Module) input circuit is detected.

This pinpoint test is intended to diagnose the following:

- 12-volt battery

- Circuitry

- BECM (Battery Energy Control Module)

PINPOINT TEST F : DTC P0A8B:64

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

F1 CHECK FOR 12-VOLT INPUT

- Ignition OFF.

- Disconnect: BECM (Battery Energy Control Module) C4237A.

- Ignition ON.

- Measure the voltage between BECM (Battery Energy Control Module) C4237A-47, circuit SBB17 (RD), harness side and ground; and between BECM (Battery Energy Control Module) C4237A-48, circuit SBB17 (RD), harness side and ground.





Are the voltages greater than 10 volts?

Yes
GO to F2.

No
VERIFY the Smart Junction Box (SJB) fuse 17 (10A) is OK. If the fuse is OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. [1][2]Diagrams By Number

F2 CHECK FOR GROUND CIRCUIT

- Ignition OFF.

- Measure the resistance between BECM (Battery Energy Control Module) C4237A-49, circuit GD126 (BK/WH), harness side and ground; and between BECM (Battery Energy Control Module) C4237A-50, circuit GD126 (BK/WH), harness side and ground.





Are the resistances less than 5 ohms?

Yes
GO to F3.

No
REPAIR the circuit(s) as necessary. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

F3 CHECK FOR CORRECT BECM (Battery Energy Control Module) OPERATION

- Check the BECM (Battery Energy Control Module) harness and component side connectors for:
- corrosion.
- pushed-out/bent pins.


- Connect the BECM (Battery Energy Control Module) and make sure the connectors seat correctly.

- Operate the system and determine if the concern is still present.

Is the concern still present?

Yes
INSTALL a new BECM (Battery Energy Control Module). REFER to Battery Energy Control Module (BECM) . TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.