Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2020 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE
Inspection Mode
| DTC | Description & trouble part | Number of driving cycles on the detecting condition | Condition |
|---|---|---|---|
| P0512 | STARTER (SWITCH) REQUEST CIRCUIT | 3 | - |
| P1518 | STARTER SWITCH CIRCUIT LOW | 3 | - |
| P1567 | AUDIO SUPPLY VOLTAGE MONITORING CIRCUIT LOW | 5 | - |
| P1568 | AUDIO SUPPLY VOLTAGE MONITORING CIRCUIT HIGH | 10 | - |
| P1580 | STARTER RELAY DIAGNOSIS CIRCUIT | 2 | - |
| P1615 | STARTER OPERATION NUMBER OF TIMES EXCESS | 1 | - |
| P161D | ELECTRIC FLUID PUMP (CVT) RELAY CIRCUIT LOW | 1 | - |
| P1625 | AUTO START REQUEST CIRCUIT LOW | 3 | - |
| P1626 | AUTO START REQUEST CIRCUIT HIGH | 3 | - |
| P1739 | ELECTRIC FLUID PUMP (CVT) DRIVE CIRCUIT | 3 | - |
| P173A | ELECTRIC FLUID PUMP (CVT) STATUS SIGNAL | 3 | - |
| P173B | ELECTRIC FLUID PUMP (CVT) PERFORMANCE | 3 | - |
| P173C | ELECTRIC FLUID PUMP (CVT) STATUS CIRCUIT LOW | 3 | - |
| P173D | ELECTRIC FLUID PUMP (CVT) STATUS CIRCUIT HIGH | 3 | - |
| P173E | ELECTRIC FLUID PUMP (CVT) INPUT VOLTAGE | 3 | - |
| P1A15 | DC/DC CONVERTER 1 BOOST COMMAND SIGNAL LOW | 2 | - |
| P1A16 | DC/DC CONVERTER 1 BOOST COMMAND SIGNAL HIGH | 2 | - |
| P1A17 | DC/DC CONVERTER 2 BOOST COMMAND SIGNAL LOW | 2 | - |
| P1A18 | DC/DC CONVERTER 2 BOOST COMMAND SIGNAL HIGH | 2 | - |
| P1A20 | DC/DC CONVERTER 1 BOOST PERFORMANCE | 2 | - |
| P1A21 | DC/DC CONVERTER 1 INPUT 1 VOLTAGE | 2 | - |
| P1A22 | DC/DC CONVERTER 1 INPUT 2 VOLTAGE | 2 | - |
| P1A23 | DC/DC CONVERTER 1 OUTPUT 1 VOLTAGE | 2 | - |
| P1A24 | DC/DC CONVERTER 1 OUTPUT 2 VOLTAGE | 2 | - |
| P1A25 | DC/DC CONVERTER 1 CIRCUIT 1 TEMPERATURE | 2 | - |
| P1A26 | DC/DC CONVERTER 1 CIRCUIT 2 TEMPERATURE | 2 | - |
| P1A27 | DC/DC CONVERTER 1 INTERNAL CIRCUIT | 2 | - |
| P1A28 | DC/DC CONVERTER 2 BOOST PERFORMANCE | 2 | - |
| P1A29 | DC/DC CONVERTER 2 INPUT 1 VOLTAGE | 2 | - |
| P1A2A | DC/DC CONVERTER 2 INPUT 2 VOLTAGE | 2 | - |
| P1A2B | DC/DC CONVERTER 2 OUTPUT 1 VOLTAGE | 2 | - |
| P1A2C | DC/DC CONVERTER 2 OUTPUT 2 VOLTAGE | 2 | - |
| P1A2D | DC/DC CONVERTER 2 CIRCUIT 1 TEMPERATURE | 2 | - |
| P1A2E | DC/DC CONVERTER 2 CIRCUIT 2 TEMPERATURE | 2 | - |
| P1A2F | DC/DC CONVERTER 2 INTERNAL CIRCUIT | 2 | - |
| P1C00 | BATTERY MONITOR MODULE "A" PERFORMANCE | 2 | - |
| P257E | Engine Hood Switch Circuit Low | 3 | - |
| P257F | Engine Hood Switch Circuit High | 3 | - |
| U0073 | CONTROL MODULE COMMUNICATION BUS OFF | 1 | - |
| U0100 | LOST COMMUNICATION WITH ECM/PCM "A" | 1 | - |
| U0122 | LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE | 1 | - |
| U0128 | LOST COMMUNICATION WITH PARK BRAKE CONTROL MODULE | 1 | - |
| U0131 | LOST COMMUNICATION WITH POWER STEERING CONTROL MODULE | 1 | - |
| U0140 | LOST COMMUNICATION WITH BODY CONTROL MODULE | 1 | - |
| U0155 | LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE | 1 | - |
| U0164 | LOST COMMUNICATION WITH HVAC CONTROL MODULE | 1 | - |
| U0230 | LOST COMMUNICATION WITH REAR GATE MODULE | 1 | - |
| U0401 | INVALID DATA RECEIVED FROM ECM/PCM "A" | 1 | - |
| U0416 | INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE | 1 | - |
| U0417 | INVALID DATA RECEIVED FROM PARK BRAKE CONTROL MODULE | 1 | - |
| U0420 | INVALID DATA RECEIVED FROM POWER STEERING CONTROL MODULE | 1 | - |
| U0422 | INVALID DATA RECEIVED FROM BODY CONTROL MODULE | 1 | - |
| U0423 | INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE | 1 | - |
| U0424 | INVALID DATA RECEIVED FROM HVAC CONTROL MODULE | 1 | - |
| U0531 | INVALID DATA RECEIVED FROM REAR GATE MODULE | 1 | - |
| U1604 | LOST COMMUNICATION WITH DC/DC CONVERTER MODULE 1 | 2 | - |
| U1712 | LOST LIN COMMUNICATION WITH BATTERY "1" MONITOR MODULE | 2 | - |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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