Chevrolet P1A56: Hybrid/EV System Voltage Discharge Circuit

Is your scanner showing Chevrolet P1A56?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

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OVERVIEW

Severity

High

DIY Difficulty Level

Advanced

Repair Cost

$500-$3500

Can I Still Drive?

What Does The Chevrolet P1A56 Code Mean?

The Vehicle is ON. The system voltage is at least 10 V. No high voltage DC sensor DTCs are present. High Voltage Contactors are commanded Open.

Within 500 milliseconds after commanding contactors open, the high voltage bus voltage fails to decrease by at least 75 V.

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

GM, 2013, Service Bullettin – HYBRID (BAS) TAC SGCM Part Restriction.
GM, 2015, Service Bullettin – HPCM Fault DTC P1A56 Hybrid Battery Voltage Discharge Circuit.

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