Fuel and air

P010D — Mass Air Flow (MAF) Sensor 'B' Circuit High

Severity: medium Drive with care, to a shop

What P010D means

P010D sets when the voltage or frequency from the mass air flow sensor 'B' circuit is higher than expected for the engine's operating conditions. The sensor measures how much air enters the engine, and the control unit uses that to calculate fuel delivery. A false or excessive reading throws off the air-fuel mixture, hurting performance, fuel economy and emissions.

Symptoms

  • Check Engine light on
  • Rough idle or hesitation
  • Weak acceleration and poor throttle response
  • Higher fuel consumption
  • Hard starting or stalling
  • Abnormal fuel trim values on a scan tool

Possible causes

  1. Dirty or failing MAF sensor
  2. Damaged wiring or connector in the MAF 'B' circuit
  3. Signal wire shorted to power
  4. Intake air leak or restriction (clogged filter, cracked duct)
  5. Poor or open sensor ground
  6. Rarely, a PCM fault or software problem

How to diagnose

  1. Scan for codes and freeze frame data, and look for related MAF, fuel trim or manifold pressure codes
  2. Inspect the sensor, connector and harness for corrosion, chafing or loose pins
  3. Watch live air flow at idle and under load and compare it with expected values for the engine size
  4. Check the air filter and the intake ducting after the sensor for cracks or leaks
  5. Test sensor power supply and ground at the connector with a multimeter
  6. Check the signal wire for a short to voltage
  7. Review fuel trims to confirm the sensor is reading wrong
  8. If needed, test with a known good sensor

Common fixes

  • Clean the sensor with a dedicated MAF cleaner
  • Repair or replace damaged wiring and connectors
  • Replace the mass air flow sensor
  • Fix intake leaks and replace the air filter or ducting
  • In rare cases, reflash or replace the PCM

Questions and answers

What does P010D mean?

The PCM is getting too high a signal from the mass air flow sensor 'B' circuit. The cause is most often the sensor itself, its wiring or an intake problem.

Can cleaning the MAF sensor fix P010D?

If the sensor is only dirty, cleaning with a proper MAF cleaner can help. Check the wiring and intake first, though, and if the code returns the sensor likely needs replacing.

Is it safe to drive with P010D?

For a short trip to a shop, usually yes. The engine may run rough or stall and fuel use will rise, so do not put off the repair.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.