P1387
Control Unit Internal Altitude Sensor
P1387 is an OBD-II diagnostic trouble code meaning: Control Unit Internal Altitude Sensor. Common causes: malfunction of the internal height sensor in the ecu, control unit power supply problems. Estimated repair cost: $167–556.
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Reduced engine power
- Check Engine Light Illuminates
- Problems starting the engine
Causes
- Malfunction of the internal height sensor in the ECU
- Control unit power supply problems
- Poor ECU grounding
- Mechanical damage to the control unit
- Short circuit in the sensor circuit
How to Fix
- Check power supply and grounding of the ECU
- Scan the control unit for other errors
- Check the integrity of the control unit
- Update ECU firmware (if possible)
- Replace engine control unit
Related codes
Error P1387 by Vehicle Brand
FAQ
What does the P1387 code mean?
P1387 is an OBD-II diagnostic trouble code that indicates: Control Unit Internal Altitude Sensor
What causes a P1387 error code?
The most common causes of P1387 include: Malfunction of the internal height sensor in the ECU; Control unit power supply problems; Poor ECU grounding; Mechanical damage to the control unit.
How do I fix a P1387 diagnostic trouble code?
To fix P1387: Check power supply and grounding of the ECU. Scan the control unit for other errors. Check the integrity of the control unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1387?
Yes, but get it checked soon
How much does it cost to fix P1387?
The estimated repair cost for P1387 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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