Pinpoint Test 1: DTC P0A8B, P0A8D Or P0A8E - 14-Volt Power Module System Voltage

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PINPOINT TEST 1: DTC P0A8B, P0A8D OR P0A8E - 14-VOLT POWER MODULE SYSTEM VOLTAGE - HYBRID

Normal Operation

With the ignition switch in the ON position and the engine on or off (the engine must have started at least once after the key was cycled to ON), the planetary gear set in the electronically-controlled continuously variable transmission (ECVT) engages the generator (also in the ECVT), which charges the high-voltage traction battery (HVTB) and supplies high-voltage to the DC/DC converter. The DC/DC converter steps the high-voltage down to 12 volts (operating range of 13.35-16 volts). The DC/DC converter charges the low-voltage battery which is used to power the PCM and low-voltage components.

- DTC P0A8B (14-Volt Power Module System Voltage) - Voltage less than 2.5 volts or greater than 25 volts on input circuit (GY/R) indicates an internal battery control module (BCM) fault will cause the BCM to set this DTC. Also if the 12-volt battery has recently had the terminals disconnected/cleaned or, if a new 12-volt battery has been recently installed the BCM may set this DTC.
- DTC P0A8D (14-Volt Power Module System Voltage Low) - Voltage less than 10 volts on input circuit (GY/R) for 5 seconds continuously, the 12-volt battery recently having the terminals disconnected/cleaned or, if a new 12-volt battery having been recently installed may cause the BCM to set this DTC.
- DTC P0A8E (14-Volt Power Module System Voltage High) - Voltage greater than 16 volts on input circuit (GY/R) for 5 seconds continuously, the 12-volt battery recently having the terminals disconnected/cleaned or if any external jump start procedure having been carried out recently may cause the BCM to set this DTC.

Possible Causes
- 12-volt battery
- HVTB

Diagnostic Procedure

Step 1-Step 4:

Step 5: