The OBD2 code P0075 signifies an issue within the circuit of the Intake Valve Timing (IVT) Control Solenoid Valve. This valve is pivotal for adjusting the timing of the engine’s intake valves, allowing for optimal engine performance and efficiency.
The presence of this code indicates that the electrical circuit controlling the solenoid, which is responsible for this valve timing adjustment, is not operating as expected. This can lead to various engine performance issues, such as rough idling or a decrease in fuel efficiency.
P0075 quick overview
| Meaning | P0075: Intake Valve Timing Control Solenoid Valve Circuit |
| Is it serious? | Yes, because it can affect the engine’s performance, leading to rough idling, reduced fuel efficiency, and potential stalling. |
| Possible causes | – Faulty IVT control solenoid valve – Open or short in the IVT solenoid valve circuit – Poor electrical connection in the IVT solenoid valve circuit – Faulty Engine Control Module (ECM) |
| How to diagnose? | Check the IVT solenoid for proper operation and resistance. Inspect the wiring and connectors for damage or poor connections. Test the circuit for shorts or opens using a multimeter. Consult ALLDATA or the manufacturer’s manual for specific diagnostic procedures. Consider ECM issues if all else fails, as a faulty ECM can cause this code without other apparent problems. |
P0075 Meaning
When your car’s computer shows the P0075 code, it’s like saying there’s a communication problem with the system that times when the engine breathes in air. This timing is crucial for your car to run smoothly and efficiently.
If the solenoid valve that controls this timing isn’t working right, your engine might run rough, stall, or use more gas than it should. The problem could be with the valve itself, the wires leading to it, or even the car’s computer. Fixing it usually involves checking these parts to make sure they’re all talking to each other correctly.
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How to fix P0075 – learn from mechanics
I looked into P0075 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: Nissan P0075
Vehicle information
2007 Nissan Altima S 2.5L
Issue + repair history
- Rough idle persists after replacing IVT (Intake Valve Timing) valve
- Engine runs smoother when IVT connector is removed
- Uncertain about ECM (Engine Control Module) wire location for resistance testing
- Previous repair attempt: Replaced IVT valve with no improvement
Other OBD2 Codes + Test Results
- P0075 – IVT Control Solenoid Valve
Mechanic suggestions
- Check ALLDATA for detailed procedure on diagnosing code P0075
- Ensure correct procedure is followed for reading and clearing diagnostic trouble codes
- Use Self-Diag Results Mode in ALLDATA for comprehensive troubleshooting steps
Final fix
Replaced ECM sourced from junkyard, had it reprogrammed, resolving rough idle issue and restoring vehicle performance.
Case #2: Land Rover P0075
Vehicle information
2008 Land Rover Range Rover HSE 4.4L
Issue + repair history
- Vehicle fails emissions test
- Persistent codes: P0075, P0081, P0695
- Codes reappear 20 seconds after clearing
- P0075 & P0081 indicate short to ground in intake valve control solenoids on both banks
- P0695 indicates fan control circuit issue
- Truck runs well and starts without problems
- Discovered open circuit at main harness near ECM & TCM, identified as a blue 16-way connector, likely caused by previous accident
Other OBD2 Codes + Test Results
- P0075: Intake Valve Control Solenoid Short to Ground (Bank 1)
- P0081: Intake Valve Control Solenoid Short to Ground (Bank 2)
- P0695: Fan Control Circuit
Mechanic suggestions
- Consider potential causes for P0081 & P0075: low oil, clogged oil system, malfunctioning solenoid or actuator, worn or misaligned timing chain
- Investigate cooling system components for P0695, including cooling sensor, fan, thermostat, or potential wiring short
- Check for short in oil filter housing heater element, known to cause multiple codes including valve timing issues
- Examine connector C0203, pins 15 and 16, which power the fan and VVT solenoids respectively, for any faults or wiring issues
- Verify battery voltage and voltage drop at the fan connector to diagnose fan circuit integrity
Final fix
Identified and repaired open circuit at the main harness near the ECM & TCM, resolving the issues causing codes P0075, P0081, and P0695.
Case #3: Toyota P0075
Vehicle information
2010 Toyota Camry LE 2.4L
Issue + repair history
- Vehicle experienced rough idling and occasional stalling
- Previous trouble codes: P0300 (Random Misfire), P0171 (System Too Lean), P0441 (Evaporative Emission Control System Incorrect Purge Flow), P0420 (Catalyst System Efficiency Below Threshold)
- Replaced spark plugs, performed fuel system cleaning, and replaced purge valve for codes P0300, P0171, and P0441
- Inspected and found faulty intake valve control solenoid for code P0075
Other OBD2 Codes + Test Results
- P0075: Intake Valve Control Circuit Bank 1
Mechanic suggestions
- Suggested replacing the faulty intake valve control solenoid with a new OEM part
- Recommended performing a thorough inspection of the intake system for any other potential issues or leaks contributing to the code
Final fix
Replaced the faulty intake valve control solenoid with a new OEM part, resolving the rough idling and stalling issues and clearing the P0075 trouble code.
How to diagnose P0075
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 the IVT solenoid and circuit | Examine the solenoid for damage and test the circuit for electrical faults. |
| Inspect wiring and connectors | Look for any damage, wear, or loose connections that could interrupt the circuit. |
| Test for open or short circuits | Use a multimeter to check for continuity and ensure there are no shorts or opens in the wiring. |
| Consult manufacturer’s diagnostics | Follow specific procedures outlined by the vehicle manufacturer or detailed in ALLDATA for accurate troubleshooting. |
| Consider ECM replacement or reprogramming | If diagnostics indicate an ECM problem, replace or reprogram the ECM as a last resort. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko