P0665 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P0665 indicates a fault in Intake Manifold Tuning Valve Control Circuit High (Bank 2), typically within powertrain controls.

Symptoms

reduced performance
increased fuel use
check engine light

Common causes

Open circuit in wiring affecting intake manifold tuning valve control circuit high (bank 2)
Broken terminal inside harness
Connector pin damage/corrosion or harness stress near related components

How to diagnose P0665

Confirm P0665 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to intake manifold tuning valve control circuit high (bank 2) for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P0665

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P0665?

Most vehicles can be driven short-term with P0665, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the intake manifold tuning valve control circuit high (bank 2) circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P0665 remains cleared under the conditions that originally set the code.

Fix options

Restore continuity and verify pin tension.
Clear corrosion and protect terminals.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$200-$900

Common mistakes when diagnosing P0665

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P0665 in common vehicles

P0665 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P0665?

P0665 is commonly set by open faults affecting intake manifold tuning valve control circuit high (bank 2).

How much does it cost to fix P0665?

For P0665, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P0665 without repair?

You can clear P0665 temporarily, but the code usually returns until the underlying fault is corrected.