P0A10: DC/DC Converter Status Circuit High

The status signal from the DC/DC converter to the hybrid control module sits above its valid range, typically because the line is shorted to a voltage source, its ground or pull-down path is open, or the converter drives the output high after an internal failure. The converter supplies the 12 V system from the traction battery, and its self-diagnosis reports problems over this status path. No manufacturer documents P0A10 publicly in an official source; older lists that call it a hybrid battery voltage sense circuit are wrong for today's J2012. Siblings: P0A08 is the general status fault, P0A09 the low signal. A converter that stops working shows up as warning lights and a falling 12 V voltage until the hybrid system shuts down.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

Hybrid system or battery warning light on
12 V battery voltage falls while driving
Possible shutdown of the hybrid system if the 12 V battery runs flat

Most likely causes

Status line shorted to 12 V or another supply
Open ground or signal return at the converter connector
DC/DC converter internal fault driving the status output high
Faulty input stage in the hybrid control module

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: hard
It can trigger limp mode.

What each character of P0A10 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
A: Hybrid or air and fuel
10: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0A10?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0A10?

The most common causes are: status line shorted to 12 V or another supply; open ground or signal return at the converter connector; dC/DC converter internal fault driving the status output high.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.