P061D

What it means

P061D is a generic code meaning the engine control module's internal monitoring has found the engine air mass to be outside what it expects. The module compares the measured or calculated air mass with the figure worked out from throttle position, engine speed and load. When the two disagree by more than the allowed amount, it sets the code. The fault may lie in the airflow inputs or in the control module itself.

Symptoms

• Engine warning light on
• Reduced power or limp mode
• Poor or uneven idle
• Hesitation or flat spots when accelerating
• Stalling or hard starting
• Worse fuel economy

Possible causes

• Faulty or contaminated mass airflow sensor giving readings that do not match the engine loadlikely
• Unmetered air entering after the airflow sensor through a leaking intake hose, cracked pipe or loose clamplikely
• Fault in the throttle body or throttle position sensing, such as sticking, heavy carbon build-up or a failing sensorpossible
• Manifold pressure sensor or boost pressure sensor reading incorrectly, or a boost leak on turbocharged enginespossible
• Wiring, connector, power supply or earth fault affecting the control module or its airflow sensorspossible
• Outdated control module software where the manufacturer has documented a known faultrare
• Internal fault in the engine control modulerare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, and note the engine speed, load and airflow values at the time the code was set.
2. Check for other related codes, such as airflow, manifold pressure, throttle or fuel trim codes, and deal with those first.
3. Visually inspect the air filter, intake pipework, clamps, breather hoses and the airflow sensor connector for damage, looseness or contamination.
4. Check the battery condition and charging voltage, then inspect the control module power and earth connections for corrosion or loose terminals.
5. Compare live airflow sensor and manifold pressure readings with expected values at idle and under load, and check fuel trims for signs of a leak.
6. Test the throttle body operation and the throttle position readings through their full range, and check for carbon build-up.
7. Smoke test the intake system to find any air leaks, including the boost side on turbo engines.
8. Check for relevant software updates or technical bulletins for the specific model and engine, and only consider the control module faulty after all inputs and supplies are proven good.

How to fix

• Repair or replace any leaking intake hose, clamp or seal, then clear the code and retest.
• Replace the mass airflow sensor if its readings are proven to be wrong, rather than cleaning or replacing it on a guess.
• Clean or replace the throttle body or its position sensor if it is sticking or giving poor readings.
• Replace a faulty manifold pressure or boost pressure sensor.
• Repair damaged wiring, connectors, power supplies or earth connections.
• Update the control module software where the manufacturer has issued a fix for a known fault, or repair or replace the module if it is confirmed faulty and set up correctly for the vehicle.

Can I keep driving?

Nearby codes

• P061CGenericInternal Control Module Engine RPM Performance
• P061EGenericInternal Control Module Brake Signal Performance