P1387
Control Unit Internal Altitude Sensor
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$167–556 (est.)
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