P1105moderate severityPowertrain
Atmospheric Pressure Sensor in Control Module
on 2002 Mercedes-Benz SL 3.0L I6 · RWD
What this code means
The ECU detected a malfunction in its internal atmospheric (barometric) pressure sensor. This sensor provides altitude compensation data for fuel and ignition calculations and is integrated within the ECU housing.
Symptoms
- Check Engine Light
- Poor high-altitude performance
- Incorrect fueling at altitude
- Reduced power
Common causes
- ECU internal barometric sensor failure
- ECU exposed to moisture
- ECU board-level defect
- Power supply issue to ECU
Diagnostic steps
- Read barometric pressure value and compare to known altitude
- Check ECU for moisture intrusion
- Compare reading with external barometric source
- Check ECU power and ground circuits
Repair notes
If the internal sensor has failed, ECU replacement may be necessary.
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P0010
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P0013
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P0014
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P0015
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