P1387 Code - Control Unit Internal Altitude Sensor
Quick Answer
P1387 indicates Control Unit Internal Altitude Sensor. Common causes include Faulty Control Module, Control Module harness is open or shorted, Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1387 indicates Control Unit Internal Altitude Sensor.
- Common causes
- Common causes include Faulty Control Module, Control Module harness is open or shorted, Control Module circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1387 Description
What are the Possible Causes of the DTC P1387?
- Faulty Control Module
- Control Module harness is open or shorted
- Control Module circuit poor electrical connection
How to Fix the DTC P1387?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1387 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P1387 Acura — Cylinder Position Sensor Intermittant Inturruption
- P1387 Audi — Control Unit Internal Altitude Sensor
- P1387 Honda — Cylinder Position Sensor Intermittant Inturruption
- P1387 Mazda — Camshaft Position Timing Solenoid 2 Circuit
- P1387 Volkswagen — Control Unit Internal Altitude Sensor
Frequently Asked Questions about P1387 Code
1. What does the OBDII code P1387 mean?
P1387 indicates a fault with the control unit's internal altitude sensor, which monitors air pressure to adjust engine performance at different elevations.
2. What are the common symptoms of code P1387?
Symptoms may include reduced engine performance, poor fuel efficiency, difficulty starting the engine, or the check engine light being illuminated.
3. What causes the P1387 code to appear?
The code can be triggered by a faulty altitude sensor, wiring issues, a malfunctioning control unit, or contamination inside the sensor.
4. Can I drive my car with the P1387 code active?
While the car may still be drivable, it can experience reduced performance and efficiency. Prolonged driving without addressing the issue may lead to further engine or sensor problems.
5. How is the P1387 code diagnosed?
A technician will typically use a scan tool to verify the code, inspect the wiring and connectors, and test the altitude sensor's functionality.
6. What repairs can fix the P1387 code?
Repairs may include replacing the altitude sensor, repairing or replacing damaged wiring, or reprogramming or replacing the control unit.
7. Is the P1387 code specific to certain car models?
While it can occur on various vehicles, the specifics of the code and related components may vary by manufacturer. Always consult your vehicle's repair manual.
8. How much does it cost to fix the P1387 code?
Repair costs depend on the root cause but typically range from $100 to $500, including parts and labor.
9. Can a dirty air filter cause the P1387 code?
No, a dirty air filter does not directly cause this code, as it relates to the control unit's internal altitude sensor, not the intake air system.
10. How can I prevent the P1387 code from recurring?
Regular maintenance, keeping electrical connections clean and secure, and addressing sensor issues promptly can help prevent the code from recurring.
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