Code
P006A
LAND ROVER
P — Powertrain
Barometric Absolute Collector Pressure - Mass Flow Correlation or volume
Views:
UK: 12
EN: 29
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty or intermittent barometric pressure (BARO) or manifold absolute pressure (MAP) sensor
- Faulty or contaminated mass air flow (MAF) sensor
- Intake air leaks (vacuum leaks, cracked hoses, loose clamps, intercooler/turbo boost leaks)
- Blocked or severely dirty air filter or intake tract restriction
- Incorrect sensor supply/reference voltage, damaged wiring or poor connector grounds
- Faulty PCM or software inconsistency (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power or limp mode on some vehicles
- Rough idle, hesitation or stumbling on acceleration
- Poor fuel economy and increased emissions
- Difficulty starting in some cases or inconsistent idle
- Possible misfires if fueling goes significantly out of correct range
What to check
- Retrieve freeze-frame and live data with a diagnostic scan tool: record BARO, MAP, MAF, IAT, RPM, throttle position and fuel trims
- Key ON, engine OFF: read BARO value and compare to local ambient pressure (scan tool) — should be within a few kPa of ambient
- Compare MAF (g/s or lb/min) to calculated airflow from MAP, RPM and IAT (many scan tools provide ‘calculated airflow’ or 'MAF learned' data)
- Visual inspection of intake plumbing, hoses, clamps, intercooler and air filter for leaks or restrictions
- Inspect wiring and connectors for BARO/MAP and MAF for damage, corrosion or loose pins
- Check for vacuum leaks with smoke machine or propane/butane enrichment while monitoring RPM/fuel trims
Signal parameters
- Barometric pressure (BARO): should approximate ambient atmospheric pressure (typical ~100 kPa at sea level); difference should be within approximately 3–5 kPa
- MAP at idle: lower than BARO due to intake vacuum — absolute value varies by engine and load
- MAF vs calculated airflow: MAF sensor reading should closely match calculated airflow from MAP, RPM and IAT within manufacturer tolerances (large persistent deviation triggers the code)
- MAF waveform: smooth, steady response to throttle changes; spikes or dropouts indicate sensor or wiring faults
- Sensor supply: reference voltage typically near 5.0 V; sensor ground should be stable — check against vehicle specifications
Diagnostic algorithm
- Confirm code and record freeze-frame data. Do not replace parts without data supporting failure.
- With a scan tool, observe live BARO, MAP, MAF, IAT, RPM and fuel trims at idle and during steady-state throttle. Note discrepancies between MAF and calculated airflow.
- Key ON, engine OFF: check BARO reading vs ambient pressure. If BARO is clearly incorrect, inspect BARO/MAP sensor and wiring.
- Perform visual inspection of intake system and air filter. Repair or replace any damaged hoses, clamps, or air filter.
- Check electrical connectors and wiring to MAF and MAP/BARO for continuity, short to power/ground, corrosion or poor contacts. Backprobe and verify reference voltage and sensor ground.
- Clean MAF with approved cleaner if contaminated. Re-test. Do not touch the sensor element.
- Perform a smoke test or use propane/enrichment to detect intake leaks while watching live fuel trims and airflow readings.
- If wiring and intake are good but readings remain inconsistent, bench-test or swap the MAF and/or BARO/MAP sensor with known-good units per service manual procedures.
- Check for and install any PCM software updates from the manufacturer that address sensor correlation algorithms.
- After repairs, clear codes and road-test while monitoring live data to confirm MAF and BARO/MAP correlation remains within specification and code does not return.
Likely causes
- Wiring/connectors to BARO/MAP or MAF (corrosion, broken wires, poor pin contact)
- Contaminated or failed MAF sensor causing incorrect mass airflow reading
- MAP/BARO sensor failure or incorrect BARO value (stuck or intermittent)
- Intake tract leak (vacuum hose, intake boot, intercooler or charge pipe leak)
- Clogged air filter or severe restriction downstream of MAF
Fault status
Status
PCM detected poor correlation between barometric/collector pressure and measured mass airflow; fault may cause MIL on and degraded engine performance until corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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