U0610: Lost Communication With Mass or Volume Air Flow Sensor B

What it means

The vehicle bus reports loss of communication with smart MAF/MVF sensor B. Air-mass calculation switches to a fallback model from MAP, RPM and IAT.

At a glance

• Usually lights the warning light of the system that lost communication
• Affects emissions; the car can fail an emissions test
• The engine or gearbox may go into limp mode

How it works

A smart mass or volume air flow sensor B measures incoming air and sends its data to the engine control module over the vehicle network. U0610 sets when sensor B's messages are lost, so the module estimates airflow from fallback inputs such as MAP, engine speed, and intake air temperature.

Common causes

Most likely first.

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

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Record freeze-frame data and scan all modules for communication codes to identify when MAF sensor B stopped reporting and whether other network faults coincide.
2. Check live airflow data for sensor B and compare it with sensor A, engine speed, MAP, and intake air temperature for a missing or implausible value.
3. Inspect sensor B's connector and bus wiring for loose terminals, contamination, chafing, or shorts.
4. Verify the sensor or module power and ground circuits against the manufacturer's specification.
5. Test the network wiring serving sensor B for opens or shorts, then assess the sensor module if its wiring and supplies pass.

Common fixes

• Reconnect or clean sensor B's electrical connector.
• Repair damaged or shorted bus wiring to MAF sensor B.
• Restore the sensor module's power or ground connection.
• Replace MAF sensor B's module if its network path and supplies are sound but it still does not communicate.

Can I keep driving?

The engine may run on estimated airflow and have reduced power or poor fuel economy, so avoid hard acceleration and heavy loads. A short trip may be possible if it runs smoothly; repair the fault promptly because fueling and emissions can be affected.