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Home / DTC / P006B — MAP - Exhaust Pressure Correlation

P006B — MAP - Exhaust Pressure Correlation

Detailed page for trouble code P006B.

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P006B

Generic P — Powertrain

MAP - Exhaust Pressure Correlation

Brand: Generic
Type: P — Powertrain
Views: UK: 11 EN: 22 RU: 18
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Page language: EN

Causes

  • Faulty MAP sensor
  • Faulty exhaust/back-pressure (EBP) sensor or pressure tap
  • Damaged wiring, poor connector contact, or corroded pins (MAP or EBP circuit)
  • Intake or exhaust leaks (vacuum leak, exhaust leak)
  • Clogged catalytic converter, diesel particulate filter (DPF) or muffler restriction
  • Stuck EGR valve or EGR system fault

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or limp-in mode
  • Poor fuel economy and increased emissions
  • Rough idle, hesitation or surging under load
  • Turbo lag or abnormal boost behavior (if applicable)
  • Black smoke or excessive soot (diesel)

What to check

  • Read freeze frame and stored live-data with a scan tool — note RPM, load, throttle position, MAP and EBP values when code set
  • Confirm vehicle-specific diagnostic procedure and sensor pinouts from service literature
  • Visually inspect MAP and EBP sensors, vacuum/pressure hoses and connections for damage, kinks, blockages or contamination
  • Check sensor connector pins for corrosion, looseness or bent terminals
  • Perform smoke or pressure test to find intake vacuum leaks and check for exhaust leaks upstream of the EBP sensor
  • Scan and compare MAP and EBP values across wide range of engine speeds/loads (idle, cruise, full-throttle) — look for expected correlation

Signal parameters

  • MAP sensor typical electrical output: ~0.5–4.5 V (varies by manufacturer) and changes with absolute manifold pressure (lower voltage = higher vacuum/low pressure depending on sensor type)
  • EBP/exhaust pressure sensor typical electrical output: ~0.5–4.5 V proportional to exhaust pressure or differential pressure (specs vary by vehicle)
  • Expected behavior: MAP and EBP values should track logically with engine load — MAP decreases (higher vacuum) at idle/low load and increases under load; EBP rises with increased exhaust flow/load. Exact kPa/psi/V ranges are vehicle-specific — consult service data
  • Related PIDs useful for correlation: MAP (kPa), intake vacuum (inHg), boost pressure (bar or psi), MAF (g/s), EGR position, fuel trims and RPM

Diagnostic algorithm

  1. Retrieve code data and freeze-frame; confirm the engine conditions when the code set (RPM, load, throttle, temperature).
  2. Inspect wiring and connectors at MAP and EBP sensors for damage, corrosion, or poor pins. Wiggle-test while monitoring live data for intermittency.
  3. With key ON engine OFF, measure sensor reference (5V or 3.3V), ground, and signal voltages at each sensor connector. Compare to OEM specifications.
  4. Start engine and observe live MAP and EBP sensor voltages/pressure PIDs at idle, partial throttle, and full load. Note if one sensor is flatlined, noisy, or out of expected range.
  5. Perform intake vacuum and exhaust pressure correlation: verify MAP value corresponds to measured intake vacuum; verify EBP increases as engine load/boost increases. Use manometer/hand-held gauge if available.
  6. Check for intake or exhaust restrictions: smoke test for intake leaks, inspect exhaust upstream of EBP for leaks, and test catalytic converter/DPF for clogging (backpressure test or flow test per service manual).
  7. Inspect and test EGR operation (if present) since stuck-open/closed EGR can affect pressures; verify EGR passages are not blocked.
  8. If wiring and mounting checks OK but readings are still inconsistent, swap in a known-good sensor (or use a lab bench test) to confirm sensor function.
  9. If new sensor and wiring good but correlation still fails, consider turbo/wastegate diagnostics (boost control) and verify PCM software/calibration. Replace PCM only if confirmed per OEM guidance.
  10. Clear codes and perform road test under the same conditions to verify repair.

Likely causes

  • Wiring/connectors to MAP or EBP sensor intermittent or shorted
  • Contaminated or clogged exhaust pressure port or lines to sensor
  • MAP sensor failure or internal drift
  • Exhaust restriction (catalyst/DPF) causing excessive EBP vs MAP readings

Fault status

⚠️ Status
MAP and exhaust/back-pressure sensor readings do not correlate within expected range for current engine operating conditions.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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