Code
P006A
Generic
P — Powertrain
MAP - Mass or Volume Air Flow Correlation Bank 1
Views:
UK: 22
EN: 35
RU: 25
AI status
Completed
Completed
100%
Causes
- Faulty or contaminated MAF (Mass Air Flow) sensor
- Faulty MAP (Manifold Absolute Pressure) sensor or baro sensor
- Vacuum or intake air leak (hose, gasket, intercooler, intake manifold)
- Blocked or restricted intake or air filter
- Damaged or corroded sensor wiring or connectors (MAF/MAP)
- Incorrect sensor reference or ground (5V reference issues)
Symptoms
- Check Engine Lamp (CEL) illuminated
- Hard starting, rough idle or stalling
- Poor throttle response or reduced power
- Decreased fuel economy or running lean/rich
- Increased emissions; possible failed emissions test
- Surging or hesitation during acceleration
What to check
- Read freeze frame and live data with a scan tool; record MAF (g/s or l/s), MAP (kPa or inHg), RPM, engine load, and fuel trims
- Check for additional DTCs (MAF/MAP/IAT/fuel trim codes)
- Visual inspection of intake plumbing, vacuum hoses, air filter, and MAF/MAP connectors
- Verify MAF sensor is clean and installed correctly; inspect for contamination or damage
- Measure MAP and MAF sensor voltages/outputs at key operating points (idle, part throttle, wide open)
- Perform a smoke or pressure test to locate intake and vacuum leaks
Signal parameters
- MAF: typical idle ~2–7 g/s (varies by engine); higher under load — check vehicle-specific spec
- MAF voltage or frequency: depends on sensor type (0–5 V or frequency 0–10 kHz); should change smoothly with RPM/airflow
- MAP: typical vacuum at idle ~20–40 kPa (or 20 inHg absolute ~ 20–40 kPa gauge); voltage often ~0.5–4.5 V depending on pressure
- IAT: should track ambient temperature reasonably closely when cranking/cold
- Fuel trims: long-term/short-term trims often go positive with true vacuum leaks (lean); negative if MAF overreports
- Correlation threshold: PCM flags P006A when computed airflow from MAP/engine speed and VE table diverges beyond manufacturer tolerance from measured MAF
Diagnostic algorithm
- Retrieve DTCs and freeze frame data. Note engine conditions when code set (RPM, load, temp).
- Visually inspect air inlet, intake piping, intercooler (if present), vacuum hoses and PCV connections for splits, cracks, or disconnected lines. Repair leaks.
- Inspect MAF sensor: check wiring/connectors for corrosion or damage and ensure proper installation. If dirty, clean with dedicated MAF cleaner and retest.
- Check MAP sensor wiring and connector for continuity, proper 5V reference and ground with key on. Compare MAP voltage to expected at key on/engine off (should reflect barometric pressure).
- With a scan tool, compare live MAF reading to MAP-derived calculated airflow at idle and at known rpms. Look for inconsistent readings (MAF very low/high vs calculated).
- Perform a smoke or pressure test of intake and vacuum system to find leaks that would upset correlation.
- If wiring and intake are good, swap with a known-good MAF or MAP (or test bench) to confirm sensor operation. Replace failed sensor(s) as needed.
- Clear codes and road test to reproduce. Monitor fuel trims and MAF/MAP correlation. If code returns, proceed to check ECM software updates and more advanced diagnostics.
- If all sensors and harnesses test OK, consider PCM fault — consult manufacturer service information before replacement.
Likely causes
- Contaminated or failing MAF sensor (very common cause)
- Vacuum or intake leak between MAF and intake manifold
- Wiring/connector problem on MAF or MAP circuit
- Failed or out-of-spec MAP sensor
Fault status
Status
PCM detected that the mass/volume airflow reported by the MAF sensor does not match the MAP-derived airflow calculation for bank 1. Check MAF and MAP sensors, wiring/connectors, and intake/vacuum integrity.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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