P0AD9 - Hybrid Battery Positive Contactor Control Circuit/Open

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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P0AD9 Possible Causes

  • Faulty System Main Relay
  • System Main Relay harness is open or shorted
  • System Main Relay circuit poor electrical connection
  • Faulty HV control ECU

First diagnose P0AD9 code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the P0AD9 code

    Labor: 1.0

    The cost of diagnosing the P0AD9 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

P0AD9 Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0ad9 Description

The SMRs (System Main Relays) connect and disconnect the high-voltage power supply circuit in accordance with requests from the HV control ECU. To ensure a reliable operation, they consists of a total of 3 relays (1 for the negative side and 2 for the positive side).

To connect, SMR1 and SMR3 turn ON initially. Then, SMR2 turns ON and SMR1 turns OFF. This process protects the circuit from the high-voltage surge current by allowing the limit current to flow via the resistor.

To disconnect, SMR2 and SMR3 turn OFF in that order. The HV control ECU checks that the relays have turned OFF properly.

The HV control ECU monitors the proper operation of the SMRs (CON1, CON2 and CON3) to check for a malfunction.

OBDII Code P0ad9 - Hybrid Battery Positive Contactor Control Circuit/Open - AutoCodes.com

P0AD9 More Information

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P0AD9 Information for specific makes

  • P0AD9 BUICK Hybrid/EV Battery Positive Contactor Control Circuit
  • P0AD9 CADILLAC Hybrid/EV Battery Positive Contactor Control Circuit
  • P0AD9 CHEVROLET Hybrid/EV Battery Positive Contactor Control Circuit
  • P0AD9 GMC Hybrid/EV Battery Positive Contactor Control Circuit
  • P0AD9 LEXUS Hybrid Battery Positive Contactor Control Circuit/Open
  • P0AD9 NISSAN Hybrid Battery Positive Contactor Control Circuit/Open
  • P0AD9 SATURN Hybrid/EV Battery Positive Contactor Control Circuit
  • P0AD9 TOYOTA Hybrid Battery Positive Contactor Control Circuit/Open

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P0AD9 Comments

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