P0AD9 Code - Hybrid Battery Positive Contactor Control Circuit/Open
Quick Answer
The SMRs (System Main Relays) connect and disconnect the high-voltage power supply circuit in accordance with requests from the HV control ECU. Common causes include Faulty System Main Relay, System Main Relay harness is open or shorted, System Main Relay circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0AD9 indicates Hybrid Battery Positive Contactor Control Circuit/Open.
- Common causes
- Common causes include Faulty System Main Relay, System Main Relay harness is open or shorted, System Main Relay circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0AD9 Description
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.
What are the Possible Causes of the DTC P0AD9?
- Faulty System Main Relay
- System Main Relay harness is open or shorted
- System Main Relay circuit poor electrical connection
- Faulty HV control ECU
How to Fix the DTC P0AD9?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0AD9 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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 Chrysler — Hybrid Battery Positive Contactor Control Circuit Open
- P0AD9 Dodge — Hybrid Battery Positive Contactor Control Circuit Open
- P0AD9 Fiat — Hybrid Battery Positive Contactor Control Circuit Open
- P0AD9 GMC — Hybrid/EV Battery Positive Contactor Control Circuit
- P0AD9 Jeep — Hybrid Battery Positive Contactor Control Circuit Open
- P0AD9 Lexus — Hybrid Battery Positive Contactor Control Circuit/Open
- P0AD9 Nissan — Hybrid Battery Positive Contactor Control Circuit/Open
- P0AD9 RAM — 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
Frequently Asked Questions about P0AD9 Code
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