Toyota Prius: Check Hybrid System Light On

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Toyota Prius: Check Hybrid System Light On

It may be difficult to diagnose a vehicle that has components you aren't familiar with. This Tech Tip will show you the ropes by guiding you through a diagnosis on the Prius. Hopefully your repair is as simple as this Real Fix and the loose DC/DC connector is the only issue.

Underhood Service Staff Writers
By Underhood Service Staff Writers
Published:
2010-toyota-prius

It may be difficult to diagnose a vehicle that has components you aren’t familiar with. This Tech Tip will show you the ropes by guiding you through a diagnosis on the Prius. Hopefully your repair is as simple as this Real Fix and the loose DC/DC connector is the only issue.

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Vehicle

2010 Toyota Prius Base, 1.8L

Complaint

The customer states the check hybrid system light is on.

Cause

Connected a scan tool and retrieved diagnostic trouble codes: P0A0D – High Voltage System Inter-Lock Circuit High; P0A09 – DC/DC Converter Status Circuit Low Input and U110 – Lost Communication With Driver Control Module. Cleared codes, performed a road test and found the codes returned. Performed a road test while monitoring live scan tool data and observed the DC/DC converter parameter was erratic. Put the vehicle into service mode by removing the hybrid system service plug, performed a visual inspection of the DC/DC converter wiring harness and connector and detected no obvious faults. With the ignition on and the engine off, used a multi-meter to check for the presence of voltage and ground at the DC/DC converter connector and found ground was not present at all times. Disconnected the DC/DC converter connector and found the connector was not fully seated when disconnecting the DC/DC connector.

Correction

Resecured the connector, cleared codes and verified the vehicle operated properly. The customer’s concern did not return.

Courtesy of Mitchell1 SureTrack Real Fix

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