The P0076 code: Intake Valve Control Solenoid Circuit Low is an OBD2 code that indicates a problem with the electrical circuit controlling the solenoid responsible for adjusting the intake valve’s operation. This issue can lead to decreased engine performance, including poor idle quality and misfires, making it crucial for vehicle owners to address promptly.
P0076 quick overview
| Meaning | P0076: Intake Valve Control Solenoid Circuit Low |
| Is it serious? | Yes, it can lead to engine performance issues and should be addressed quickly. |
| Possible causes | – Faulty intake valve control solenoid – Issues with wiring or connectors in the solenoid circuit – Low voltage in the solenoid circuit |
| How to diagnose? | Inspect the electrical connections to the solenoid for corrosion or damage. Measure the solenoid’s resistance and voltage to ensure proper operation. Review the ECM’s condition for faults or necessary updates. Examine related wiring for any signs of damage or shorts. Consider related codes for a broader understanding of the issue. |
P0076 Meaning
The P0076 code signifies that the engine’s brain, the ECM, is detecting a weaker electrical signal than expected in the circuit controlling the intake valve’s solenoid. This small but mighty component is essential for managing how much air enters the engine.
If it’s not working correctly, you might notice your car running rough, stalling, or the check engine light might turn on. It’s like having a clogged nose; your car struggles to “breathe” properly, affecting its performance.
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How to fix P0076 – learn from mechanics
I looked into P0076 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Porsche P0076
Vehicle information
2012 Porsche Panamera 4 3.6L
Issue + repair history
- Car presented with poor idle quality, misfire, and MIL lamp on
- Previous shop replaced bank 1 VVT solenoid and performed an oil change
- Symptoms persisted, and the code P0076 (Valve Lift Control) appeared after driving 1/4 mile
- Lift solenoid on the back of the head for bank 1 was identified as the culprit
- Original code was P0076, but the wrong solenoid was replaced initially, causing confusion and additional troubleshooting
Other OBD2 Codes + Test Results
- P0010: Circuit VVT Solenoid Bank 1
- P0020: Circuit VVT Solenoid Bank 2
- P0076: Valve Lift Control
- P0136: O2 Bank 1 Sensor 2
- P0300: Misfire Detected
- P0301, P0302, P0303: Individual Cylinder Misfires
Mechanic suggestions
- Check plugs and coils for wear or damage, as misfires can trigger VVT codes
- Investigate fuse 34 and the heated thermostat for possible circuit issues
- Clarify repair process and steps taken for better understanding and troubleshooting assistance
Final fix
Replaced the lift solenoid on the back of the head for bank 1, correcting the misfire, poor idle, and MIL lamp issues. Proper diagnosis and replacement of the correct solenoid resolved the problem.
Case #2: Mazda P0076
Vehicle information
2006 Mazda RX-8 1.3L
Issue + repair history
- Car had MIL lamp on with codes P0076 (Intake Valve Control Solenoid Circuit Low) and P0661 (Intake Manifold Tune Valve Control Circuit Low)
- Tested power to solenoids and found it to be good, but solenoids were open circuits
- Replaced the faulty solenoids located at the back of the engine under the intake manifold
- Job took approximately 4 hours, including drive cycle to confirm repair
Other OBD2 Codes + Test Results
- P0076: Intake Valve Control Solenoid Circuit Low
- P0661: Intake Manifold Tune Valve Control Circuit Low
Mechanic suggestions
- Estimated job duration ranged from 3.5 to 4 hours, including drive cycle testing
- Ensure to inspect and load test all wiring while performing the solenoid replacement
Final fix
Replaced the faulty solenoids located at the back of the engine under the intake manifold. Job took approximately 4 hours, and the car returned to normal operation after replacement.
Case #3: Subaru P0076
Vehicle information
2007 Subaru Outback 2.5i Limited 2.5L
Issue + repair history
- MIL lamp on with code P0076 (Intake Valve Control Circuit Low Bank 1)
- Initial diagnosis pointed to a failed ECM, but after replacing it with a used one, a DTC came up for the immobilizer system not matching the key code
- Dealer suggested replacing three ECUs (transponder, body control module, and ECM), but the customer returned without repair
- Received helpful replies clarifying that only the ECM needs replacement, and all existing keys must be re-registered at the dealership
Other OBD2 Codes + Test Results
- P0076: Intake Valve Control Circuit Low Bank 1
Mechanic suggestions
- Disputed dealer’s advice, suggesting that only the ECM needs replacement, and existing keys need re-registration at the dealership
- Advised to check the position sensor for the intake runner as ECM failure is unlikely
Final fix
Replaced the ECM, ensuring it was new, and re-registered all existing keys at the dealership. The car was back to normal operation after this procedure.
How to diagnose P0076
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Brief Explanation |
|---|---|
| Check plugs and coils | Misfires can indicate issues beyond the solenoid; inspect for wear or damage. |
| Test power to solenoids | Ensure the solenoids receive proper voltage; inadequate power can trigger the code. |
| Inspect electrical connections | Look for corrosion, loose, or damaged wires in the solenoid circuit. |
| Examine the solenoid | Test the solenoid’s functionality with a multimeter for resistance and operation. |
| Review ECM for faults | A malfunctioning ECM can incorrectly report solenoid issues; assess for updates or errors. |
| Consider related OBD2 codes | Addressing codes related to VVT or misfires may resolve the P0076 issue. |
| Inspect wiring and connectors | Check the wiring harness for shorts, opens, or poor connections that could affect the circuit. |
| Evaluate fuse and relay | Ensure the fuse and relay related to the intake valve control are functioning correctly. |
| Perform a system reset | Sometimes, a simple ECM reset can clear transient faults that may cause this code. |
| Consult dealership or specialist | If the issue persists, professional diagnostic equipment or advice may be needed. |
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✅ 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)