Mass Air Flow Sensor Performance

Some 2019-2020 Escalade, Silverado 1500, Silverado 2500/3500, Tahoe, Suburban, Sierra 1500, Sierra 2500/3500, and Yukon models equipped with the 5.3L V8 engine (RPO L82, L83, L84), 6.2L V8 engine (RPO L86, L87), or 6.6L V8 engine (RPO L8T) may have an illuminated Check Engine MIL and DTC P1682 (Ignition 1 Switch Circuit 2) set. DTCs P0101 (Mass Air Flow Sensor Performance), P0689 (Engine Controls Ignition Relay Feedback Circuit Low Voltage), P16A7 (Engine Controls Ignition Relay Feedback Circuit 2), or P16BC (Engine Controls Ignition Relay Feedback Circuit 3) also may be set. In addition, the vehicle may have had the Mass Air Flow (MAF) sensor replaced recently for DTC P0101.

If these conditions are found, there may be a faulty ignition relay or underhood fuse block terminal concern. (Fig. 22)

Fig. 22

Before replacing the MAF sensor for DTC P0101, inspect the underhood fuse block ignition relay circuits. Replace the underhood ignition relay if required.

Also diagnose any applicable DTCs before replacing the MAF sensor. (Fig. 23) Refer to the appropriate Service Information for diagnosing each DTC.

Fig. 23

– Thanks to Richard Renshaw

Diagnosing a Shudder Vibration Condition
Diagnosing DTCs P0016 and P0018

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