Powertrain, generic · Hybrid propulsion

P0A10 DC/DC Converter Status Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

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

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

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,800
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dcdc converterwiring harnesshybrid control module

Related codes

P0A08P0A09P0A13P0A94P0563

References: law.cornell.edu, patents.google.com, static.nhtsa.gov.