U064F: Lost Communication With Intake Manifold Runner Position Sensor Bank 1

What it means

A control module has stopped receiving expected network messages from the intake manifold runner position sensor on bank 1. The effect on runner control and engine operation depends on the vehicle's system design.

At a glance

• Usually lights the warning light of the system that lost communication
• Affects emissions; the car can fail an emissions test

How it works

The bank 1 intake manifold runner position sensor reports the position of the runners that direct intake air through the manifold. This code sets when a module stops receiving the sensor's expected network messages, so the system may not be able to confirm or control runner position.

Common causes

Most likely first.

1. Bus wiring open or shorted
2. Module without power or ground
3. Module failed

Symptoms

• Warning light or message related to the affected system
• Engine performance may be affected

How to diagnose it

1. Record freeze-frame data and scan all modules for intake-runner and communication codes to determine when bank 1 sensor messages disappeared.
2. Check live data for a bank 1 runner position reading while the engine or scan-tool command changes runner position, if supported.
3. Inspect the bank 1 runner position sensor connector and network wiring for damage, corrosion, looseness, or contact with hot engine parts.
4. Check power and ground at the sensor or its associated module using the manufacturer's wiring information.
5. Test the network circuit for opens or shorts, then assess the bank 1 sensor or module if its wiring and electrical feeds pass.

Common fixes

• Reconnect or clean the bank 1 runner position sensor connector.
• Repair damaged network wiring or connector terminals.
• Restore the sensor module's power or ground.
• Replace the bank 1 runner position sensor or module if circuit checks pass but communication does not return.

Can I keep driving?

If the engine runs smoothly, a short drive may be possible, but avoid hard acceleration if power or response is reduced. A runner-control fault can worsen drivability and increase emissions.