What Does P1553 Mean?
The ECM has detected an implausible relationship between the barometric pressure sensor and manifold absolute pressure sensor readings. This indicates either sensor failure or a mechanical issue affecting intake manifold pressure.
Common Causes
40%
Failed or degraded MAP sensor providing inaccurate readings
25%
Vacuum leak in intake manifold or associated hoses
20%
Failed barometric pressure sensor or integrated sensor malfunction
10%
Restricted or clogged intake air filter affecting pressure readings
5%
ECM software calibration issue
Diagnostic Steps
1
Step 1: Compare live data BARO and MAP sensor readings at key-on engine-off (should be approximately equal at sea level)
2
Step 2: Monitor MAP sensor voltage/reading with engine running at idle and during throttle snap; verify smooth transitions
3
Step 3: Perform smoke test or propane enrichment test to identify any vacuum leaks in intake system
4
Step 4: Inspect and clean MAP sensor, check vacuum line to MAP sensor for restrictions or damage
5
Step 5: Test MAP sensor with vacuum pump to verify proper voltage response across range
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
The ECM has detected an implausible relationship between the barometric pressure sensor and manifold absolute pressure sensor readings. This indicates either sensor failure or a mechanical issue affecting intake manifold pressure.
The most common cause of P1553 (Barometric/manifold pressure signal ratio out of range) is: Failed or degraded MAP sensor providing inaccurate readings
Typical repair costs for P1553 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may experience poor acceleration, rough idle, and increased fuel consumption. Continued operation may damage catalytic converter.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1553 to identify the root cause.
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Quick Info
Category
Powertrain
System
Air/Fuel Management System
Difficulty
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