The P0AA2: Hybrid Battery Positive Contactor Circuit Stuck Open refers to a problem where the hybrid battery’s positive contactor is not closing as it should. This can result in the hybrid battery being unable to properly connect to the vehicle’s electrical system, which can cause a failure in the battery’s operation, affecting the vehicle’s performance.
P0AA2 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0AA2: Hybrid Battery Positive Contactor Circuit Stuck Open |
| Is it serious? | Yes, this code can lead to hybrid battery malfunctions and safety risks. |
| Possible causes | – Positive contactor stuck open – Faulty contactor – Control circuit issue |
| How to diagnose? | – Test positive contactor functionality – Inspect contactor for sticking – Check control circuit for faults |
P0AA2 Meaning
The P0AA2: Hybrid Battery Positive Contactor Circuit Stuck Open code means that the hybrid battery’s positive contactor is not closing properly. The battery cannot connect with the vehicle’s electrical system, which prevents the battery from powering the vehicle or being charged as needed. This could be due to the contactor being stuck open, a faulty contactor, or an issue with the control circuit that operates the contactor.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional fault codes that may help diagnose related issues. | OBD-II Scanner |
| Test Positive Contactor | Check if the positive contactor is functioning properly by verifying if it closes and completes the circuit. | Multimeter, Diagnostic Tool |
| Inspect the Contactor for Sticking | Visually inspect the contactor for any mechanical issues, like sticking or physical damage. | Flashlight, Safety Gloves |
| Check Control Circuit | Test the control circuit to ensure that it is providing the correct signals to open and close the contactor. | Multimeter, Circuit Tester |
| Clear the Code and Test Drive | Clear the code using an OBD-II scanner after making repairs, then test drive the vehicle to ensure the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, scan the vehicle again to confirm that the P0AA2 code does not reappear. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)