Code
P006C
Generic
P — Powertrain
MAP - Turbocharger/Supercharger Inlet Pressure Correlation
Views:
UK: 18
EN: 37
RU: 25
AI status
Completed
Completed
100%
Causes
- Faulty MAP sensor
- Faulty turbocharger/supercharger inlet (boost) pressure sensor
- Damaged or corroded wiring or connector(s) for either sensor
- Vacuum, intake tract, intercooler or boost leaks
- Stuck or damaged turbocharger wastegate/actuator or boost control solenoid
- Blocked or restricted intake or intercooler passages
Symptoms
- MIL/Check Engine Light illuminated
- Reduced engine power or limp-home mode
- Poor or delayed boost response (turbo lag)
- Surging or unstable idle under some conditions
- Increased fuel consumption or poor drivability
- Possible loud wastegate flutter or unusual turbo noises
What to check
- Connect a capable scan tool and read freeze-frame and freeze DTC data
- Monitor live MAP and boost/inlet pressure sensor data at key ON, idle, part load and wide-open throttle — compare shapes and timing
- Verify MAP and boost sensor reference voltage (typically 5 V) and sensor ground integrity with backprobe or DVOM
- Perform a visual inspection of connectors, wiring harness, and sensor mounting for damage or corrosion
- Inspect vacuum, intake hoses, intercooler and charge-air plumbing for leaks, cracks or loose clamps
- Smoke-test intake and charge-air system to find leaks if correlation deviates under boost
Signal parameters
- MAP sensor output: typically ~0.5–4.5 V mapped to ~10–250 kPa (absolute) depending on vehicle
- Turbo inlet/boost pressure sensor output: typically ~0.5–4.5 V mapped from vacuum to positive boost (gauge or absolute units vary by vehicle)
- At key-on with engine off, MAP voltage should approximate barometric/ambient pressure reading
- Under given engine loads the MAP and boost sensor signals should follow expected correlation curves (no sudden divergence)
- Reference voltage (Vref) to sensors typically ~5.0 V; sensor ground should be near 0 V
Diagnostic algorithm
- Retrieve and record code(s), freeze frame data and live MAP and boost sensor values with a scan tool.
- Duplicate conditions that set the code (idle, cruise, WOT) while monitoring both sensors; note where signals diverge.
- With ignition ON (engine off) verify sensor Vref and ground present at each sensor. Replace wiring/repair grounds if abnormal.
- Visually inspect connectors and harness for damage; repair any chafing, corrosion or loose pins.
- Inspect and perform a smoke test of intake, intercooler and charge-air plumbing; repair any leaks and re-test sensors.
- Check operation of boost control solenoid and turbo/wastegate actuator (apply vacuum/pressure where applicable) and verify actuator moves and changes boost as expected.
- If wiring and actuation check good, remove and bench-test or swap MAP and boost sensors where practical or compare to a known-good sensor.
- Clean sensor ports if contaminated; replace suspect sensor(s) and clear codes.
- After repairs, perform a road test under the same conditions to confirm correlation restored and code does not return.
- If problem persists after sensors, wiring and mechanical checks, consider PCM/ECM diagnostics or manufacturer-specific updates/calibrations.
Likely causes
- Loose, damaged or shorted sensor connector or harness
- MAP or boost sensor producing incorrect voltage/pressure signal
- Intake/charge-air leak between turbo and intake manifold (reduces correlation)
- Faulty boost control solenoid or actuator causing unexpected boost behavior
- Contaminated/blocked sensor ports (debris, oil)
Fault status
Status
Correlation fault: MAP sensor and turbocharger/supercharger inlet pressure sensor signals disagree outside allowed thresholds. PCM may limit boost and trigger MIL.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
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