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Home / DTC / P00B8 — MAP - Mass or Volume Air Flow Correlation Bank 2

P00B8 — MAP - Mass or Volume Air Flow Correlation Bank 2

Detailed page for trouble code P00B8.

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P00B8

Generic P — Powertrain

MAP - Mass or Volume Air Flow Correlation Bank 2

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Contaminated, damaged or failing MAF sensor on Bank 2 intake path
  • Faulty MAP sensor or intermittent MAP signal
  • Intake air leaks (vacuum leaks) downstream of the MAF or upstream of MAP
  • Restricted or leaking intake tract, air filter, or charge piping (turbo applications)
  • Vacuum hose or PCV system faults
  • Wiring or connector damage including shorts, opens, or corrosion for MAF or MAP circuits

Symptoms

  • Malfunction Indicator Lamp (MIL) on
  • Poor idle quality or stalling
  • Hesitation, surging or reduced power under load
  • Poor fuel economy or rich/lean running
  • Black smoke from exhaust (if excessively rich)
  • Difficulty starting or extended crank time

What to check

  • Retrieve freeze frame and live data (MAF g/s or V, MAP kPa or V, engine RPM, fuel trims, intake air temp)
  • Visual inspection of intake plumbing, air filter, MAF and MAP connectors and wiring
  • Check for vacuum leaks (spray, smoke test or smoke machine) between MAF and manifold and around MAP source
  • Inspect/clean or temporarily replace air filter and MAF element/sensor (follow manufacturer cleaning procedure if applicable)
  • Backprobe MAF and MAP connectors to verify reference voltage, ground and signal with key on/engine running
  • Compare MAF reading to calculated airflow from MAP, RPM and VE (using scan tool or manufacturer diagnostic data)

Signal parameters

  • MAF sensor: signal type varies (voltage, frequency, or frequency/voltage) — output rises with airflow. Typical idle MAF may read low single-digit g/s on small engines, higher on larger engines; consult manufacturer data.
  • MAP sensor: measures manifold absolute pressure in kPa or bar. Typical atmospheric ≈101 kPa; at idle manifold vacuum typically lower (e.g., 20–50 kPa depending on engine). MAP sensor often outputs ~0.5–4.5 V over range.
  • Expected relationship: as RPM and throttle increase, MAP should rise toward atmospheric and MAF should increase proportionally. Fuel trims should remain near baseline (small +/- %) if sensors correlate.
  • Electrical: sensor reference commonly 5 V reference and ground; signal should be stable and not intermittent.

Diagnostic algorithm

  1. Read and record freeze frame and live data: MAF, MAP, intake air temp, engine RPM, short/long term fuel trims, boost (if fitted).
  2. Visually inspect air filter, intake tubing, intercooler piping (if turbo), vacuum hoses, PCV and EGR plumbing for cracks, loose clamps or disconnects. Repair any issues and retest.
  3. With engine idling, monitor live MAF and MAP signals. Wiggle wiring and connectors to check for intermittent faults. Repair damaged wiring/connectors.
  4. Perform a smoke test or use carb spray while watching RPM/MAF: if airflow/idle changes when sprayed around intake between MAF and throttle body, suspect unmetered air (vacuum leak).
  5. Clean MAF per manufacturer instructions if contaminated (don’t use other cleaners). Re-test; if code returns or signal abnormal, consider replacement.
  6. Compare MAF measured airflow to calculated airflow from MAP, RPM and known volumetric efficiency (use manufacturer data or an advanced scan tool). Significant mismatch indicates faulty sensor or intake leakage.
  7. Test MAP sensor electricals: verify reference voltage, ground and signal voltage sweep with changing manifold pressure (vacuum pump or varying throttle). Replace sensor if out of spec.
  8. If vehicle is forced-induction, check boost control components, intercooler, and for boost leaks/clogs that alter MAP vs MAF correlation.
  9. If wiring and sensors test good but correlation still off, check for mechanical issues (sticking EGR, intake restriction, valve problems) and software updates for ECM.
  10. After repairs or sensor replacement, clear codes and perform a road test with live data monitoring to confirm the correlation is restored and code does not return.

Likely causes

  • MAF contamination or failing MAF sensor
  • Intake leak between MAF and engine (unmetered air)
  • Faulty MAP sensor or wiring to MAP
  • Clogged air filter or restriction in intake tract

Fault status

⚠️ Status
MAP/MAF correlation out of expected range — Bank 2 (MAF vs MAP disagreement)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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Code

P00B8

LAND ROVER P — Powertrain

MAP - Correlation of airflow in mass or volume - Bank 2

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Contaminated, damaged or failing MAF sensor on Bank 2 intake path
  • Faulty MAP sensor or intermittent MAP signal
  • Intake air leaks (vacuum leaks) downstream of the MAF or upstream of MAP
  • Restricted or leaking intake tract, air filter, or charge piping (turbo applications)
  • Vacuum hose or PCV system faults
  • Wiring or connector damage including shorts, opens, or corrosion for MAF or MAP circuits

Symptoms

  • Malfunction Indicator Lamp (MIL) on
  • Poor idle quality or stalling
  • Hesitation, surging or reduced power under load
  • Poor fuel economy or rich/lean running
  • Black smoke from exhaust (if excessively rich)
  • Difficulty starting or extended crank time

What to check

  • Retrieve freeze frame and live data (MAF g/s or V, MAP kPa or V, engine RPM, fuel trims, intake air temp)
  • Visual inspection of intake plumbing, air filter, MAF and MAP connectors and wiring
  • Check for vacuum leaks (spray, smoke test or smoke machine) between MAF and manifold and around MAP source
  • Inspect/clean or temporarily replace air filter and MAF element/sensor (follow manufacturer cleaning procedure if applicable)
  • Backprobe MAF and MAP connectors to verify reference voltage, ground and signal with key on/engine running
  • Compare MAF reading to calculated airflow from MAP, RPM and VE (using scan tool or manufacturer diagnostic data)

Signal parameters

  • MAF sensor: signal type varies (voltage, frequency, or frequency/voltage) — output rises with airflow. Typical idle MAF may read low single-digit g/s on small engines, higher on larger engines; consult manufacturer data.
  • MAP sensor: measures manifold absolute pressure in kPa or bar. Typical atmospheric ≈101 kPa; at idle manifold vacuum typically lower (e.g., 20–50 kPa depending on engine). MAP sensor often outputs ~0.5–4.5 V over range.
  • Expected relationship: as RPM and throttle increase, MAP should rise toward atmospheric and MAF should increase proportionally. Fuel trims should remain near baseline (small +/- %) if sensors correlate.
  • Electrical: sensor reference commonly 5 V reference and ground; signal should be stable and not intermittent.

Diagnostic algorithm

  1. Read and record freeze frame and live data: MAF, MAP, intake air temp, engine RPM, short/long term fuel trims, boost (if fitted).
  2. Visually inspect air filter, intake tubing, intercooler piping (if turbo), vacuum hoses, PCV and EGR plumbing for cracks, loose clamps or disconnects. Repair any issues and retest.
  3. With engine idling, monitor live MAF and MAP signals. Wiggle wiring and connectors to check for intermittent faults. Repair damaged wiring/connectors.
  4. Perform a smoke test or use carb spray while watching RPM/MAF: if airflow/idle changes when sprayed around intake between MAF and throttle body, suspect unmetered air (vacuum leak).
  5. Clean MAF per manufacturer instructions if contaminated (don’t use other cleaners). Re-test; if code returns or signal abnormal, consider replacement.
  6. Compare MAF measured airflow to calculated airflow from MAP, RPM and known volumetric efficiency (use manufacturer data or an advanced scan tool). Significant mismatch indicates faulty sensor or intake leakage.
  7. Test MAP sensor electricals: verify reference voltage, ground and signal voltage sweep with changing manifold pressure (vacuum pump or varying throttle). Replace sensor if out of spec.
  8. If vehicle is forced-induction, check boost control components, intercooler, and for boost leaks/clogs that alter MAP vs MAF correlation.
  9. If wiring and sensors test good but correlation still off, check for mechanical issues (sticking EGR, intake restriction, valve problems) and software updates for ECM.
  10. After repairs or sensor replacement, clear codes and perform a road test with live data monitoring to confirm the correlation is restored and code does not return.

Likely causes

  • MAF contamination or failing MAF sensor
  • Intake leak between MAF and engine (unmetered air)
  • Faulty MAP sensor or wiring to MAP
  • Clogged air filter or restriction in intake tract

Fault status

⚠️ Status
MAP/MAF correlation out of expected range — Bank 2 (MAF vs MAP disagreement)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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