U060F

Code

Generic U — Network/User

Lost Communication With Mass or Volume Air Flow Sensor A

Brand: Generic

Type: U — Network/User

Views: UK: 37 EN: 281 RU: 43

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Broken, corroded, loose or disconnected MAF sensor connector or wiring
Failed MAF sensor (internal electronics)
Poor reference power or ground for the sensor
Intermittent/open/short on the data/communication line (CAN/LIN/analog)
Blown fuse or relay supplying sensor or module power
Control module (ECM/PCM) communication port or software fault

Symptoms

Malfunction Indicator Lamp (MIL) or warning light illuminated
Engine runs rough, hesitates, stalls or has poor idle
Reduced engine power or limp-in mode
Poor fuel economy and increased emissions
MAF live data missing, frozen, or not changing with RPM on a scan tool
Intermittent drivability problems that may come and go

What to check

Connect a capable scan tool; read freeze frame, pending and permanent codes and check live MAF data
Verify communications to the MAF module (if networked) using the scan tool—check for presence and update rate of the MAF message
Visually inspect MAF connector and wiring for damage, corrosion, insect nests, oil contamination or pin deformation
Check fuses and relays that feed the MAF and associated control modules
Backprobe the MAF connector and measure reference voltage (usually 5 V or vehicle specified), signal voltage and ground integrity with key ON and engine OFF
Wiggle wiring and connector while watching live data/communication status to find intermittent faults

Signal parameters

MAF signal typically an analog voltage or frequency proportional to airflow (common range 0–5 V)
Reference voltage most commonly 5 V (verify specific vehicle data)
Sensor ground continuity should be low resistance (near 0 Ω) to vehicle ground
MAF live data should change smoothly with throttle/RPM (airflow g/s or L/s, or voltage)
If MAF is on a serial bus, its message should appear regularly (typical message interval 10–100 ms depending on vehicle)

Diagnostic algorithm

Retrieve and record all DTCs, freeze frame and live MAF or airflow data with a scan tool. Note whether code is stored as network loss, timeout, or invalid data.
Inspect the MAF connector and harness for obvious damage, oil contamination, or corrosion. Repair as needed.
Check relevant fuses and circuit protection; replace if blown and retest.
With connector connected, backprobe and verify reference voltage and ground at the sensor connector. Compare to OEM spec. If voltages bad, trace and repair power/ground circuits.
Verify the signal line: observe MAF output while cranking/running — it should vary with airflow. If no signal, disconnect and measure sensor output or bench test sensor per service procedure.
If the MAF communicates over CAN/LIN, use a scope or bus diagnostic tool to check for correct bus levels and message traffic. Look for bus-off conditions or excessive errors.
Perform continuity and short-to-voltage/ground checks on wiring between MAF connector and control module. Repair any open/shorts.
If wiring and power/ground are good but the sensor does not respond, replace the MAF sensor and retest.
If problem persists after replacing sensor, suspect control module fault or software—check for TSBs or reprogramming, and verify other modules on the same bus for faults.
Clear codes and perform a road test to confirm repair; re-scan to ensure code does not return.

Likely causes

Corroded/contaminated connector pins at the MAF harness
Broken wire inside harness near connector or along routing
Failed MAF sensor due to contamination or internal component failure
Open or high-resistance ground or missing reference voltage
CAN/LIN bus wiring shorted or bus off condition from another module

Fault status

⚠️ Status

Control module detected no valid communication or data from Mass/Volume Air Flow Sensor A. The sensor’s data stream is missing, invalid, or interrupted (wiring, sensor electronics, or network fault).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 4.0 hours