P0069
Manifold Absolute Pressure - Barometric Pressure CorrelationP0069 is a generic OBD-II powertrain diagnostic trouble code: Manifold Absolute Pressure - Barometric Pressure Correlation. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0069 means
Code P0069 is set when the powertrain control module (PCM) detects an implausible or out-of-range difference between the manifold absolute pressure (MAP) sensor reading and the barometric pressure (BARO) sensor reading. Under normal operating conditions — particularly at key-on with the engine off, or at wide-open throttle on a naturally aspirated engine — MAP and BARO readings should closely agree, since manifold pressure equals atmospheric pressure in those states. The PCM uses this correlation check to validate that both sensors are functioning correctly and that neither has drifted out of calibration. The BARO sensor is often integrated into the mass airflow (MAF) sensor housing or the PCM itself, while the MAP sensor is a standalone unit on the intake manifold. A large discrepancy between the two — typically more than a defined threshold such as 10–15 kPa — triggers P0069. This code is particularly relevant on turbocharged and supercharged vehicles where the MAP sensor may also serve as a boost pressure sensor, but it also appears on naturally aspirated engines. Because both sensors feed into the PCM's fuel delivery and spark timing calculations, an undetected sensor fault can lead to incorrect air/fuel ratios, engine knock, or elevated emissions.
Common causes
Most-frequently reported root causes when P0069 is logged.
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1
Faulty MAP sensor providing readings that do not correlate with atmospheric pressure at idle or key-on
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2
Faulty BARO sensor (often integrated into the MAF sensor) outputting incorrect atmospheric pressure reference
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3
Damaged, cracked, or collapsed vacuum hose between the intake manifold and the MAP sensor, causing false low-pressure readings
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4
Vacuum leak in the intake system upstream of the MAP sensor causing manifold pressure to read artificially high at idle
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5
Contaminated or oil-fouled MAP sensor port causing slow or incorrect pressure response
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6
Wiring fault (short, open, or high resistance) in the MAP or BARO sensor signal circuit
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7
Failed PCM or corrupted sensor calibration data
Symptoms drivers notice
How to diagnose P0069
A typical diagnostic flow when this code is present.
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1
At key-on engine off, compare live MAP and BARO sensor readings with a scan tool — they should be within approximately 5 kPa of each other; a large gap confirms the correlation fault
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2
Inspect the vacuum hose between the intake manifold and the MAP sensor for cracks, kinks, or disconnection; replace if damaged
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3
Check the MAP sensor port on the intake manifold for carbon deposits or oil contamination; clean the port and sensor with throttle body cleaner if fouled
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4
Perform a MAP sensor sweep test: at idle the MAP should read approximately 30–45 kPa on a naturally aspirated engine, climbing to near BARO at wide-open throttle; erratic or fixed readings indicate a failed sensor
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5
Inspect MAP and BARO sensor wiring and connectors for corrosion, bent pins, or chafing; check reference voltage (typically 5V), ground, and signal voltage
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6
If the MAF sensor contains the integrated BARO sensor, inspect and if necessary replace the MAF/BARO assembly
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7
Clear codes after any repair and verify the MAP-BARO correlation at key-on and during a drive cycle before returning the vehicle to service
Related powertrain codes
Frequently asked questions
Can a loose gas cap cause P0069?
No. P0069 is specific to the correlation between the MAP sensor and the barometric pressure sensor and is not related to the evaporative emissions system or fuel tank pressure. A loose gas cap would set EVAP codes such as P0440 or P0442.
Is P0069 more common on turbocharged vehicles?
It can appear on both naturally aspirated and turbocharged engines, but on turbocharged vehicles the MAP sensor operates across a much wider pressure range (below atmospheric in vacuum to well above in boost), which can make sensor drift or vacuum hose faults more impactful and more likely to trigger the correlation fault.
Can altitude trigger a false P0069?
Theoretically, both sensors should adjust proportionally to altitude, so genuine high-altitude driving should not cause this code if both sensors are healthy. However, if only one sensor compensates correctly and the other is slow to adapt or is stuck at sea-level calibration, high altitude could expose an underlying sensor weakness and contribute to the code being set.
How do I know if the MAP sensor or BARO sensor is the faulty one?
Compare the BARO reading on the scan tool to a known local atmospheric pressure (from a weather station or smartphone app). If the BARO reading is wrong, the issue is likely the MAF-integrated BARO sensor. If BARO is correct but MAP reads implausibly at engine-off conditions, the MAP sensor or its vacuum hose is the likely culprit.
Disabling P0069 in software
RaceTune can permanently disable P0069 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
ECU families we can disable P0069 on
We hold the DaVinci A2L disable definitions for these families, so the exact P0069 path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.
- Bosch EDC17C60 verified
- Bosch EDC17CP09 verified
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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