p1387 control unit internal altitude sensor
OBD2 Code: P1387
Description: Control Unit Internal Altitude Sensor
Definition: This code indicates a malfunction in the vehicle’s control unit related to the internal altitude sensor, which is responsible for measuring atmospheric pressure to adjust engine parameters accordingly.
p1387 – Control unit internal altitude sensor
Severity: Critical
Common Causes
p1387 – Control Unit Internal Altitude Sensor
Common causes:
- Faulty altitude sensor
- Wiring issues in the altitude sensor circuit
- Corrosion or poor connection at the altitude sensor connector
- Software issues in the control unit related to altitude sensor readings
Common Misdiagnosis
OBD2 Code: P1387
Description: Control Unit Internal Altitude Sensor
Common Misdiagnosis: Replacing the control unit without verifying the sensor’s actual failure or overlooking wiring and connector issues.
Common Diagnostic Steps
OBD2 Code: P1387
Description: Control Unit Internal Altitude Sensor
Common Diagnostic Steps:
- Verify the code using an OBD2 scanner and check for any additional codes.
- Inspect the wiring and connectors related to the control unit for damage or corrosion.
- Check the power supply and ground connections to the control unit.
- Test the altitude sensor signal with a multimeter or oscilloscope to ensure it is within specifications.
- Consult vehicle-specific repair manuals for further diagnostic procedures related to the altitude sensor circuit.
- If necessary, replace or reprogram the control unit as per manufacturer guidelines.