AutoCodes – Generic – P159A

P159A Code - G Sensor Circuit

Quick Answer

The G Sensor has a semiconductor acceleration sensor and detects longitudinal G and tilt angle of the vehicle based on gravitational acceleration. Common causes include Faulty G Sensor, G Sensor harness is open or shorted, G Sensor 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: P159A indicates G Sensor Circuit.
Common causes: Common causes include Faulty G Sensor, G Sensor harness is open or shorted, G Sensor 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.

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Code Popularity 4,647

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P159A Description

The G Sensor has a semiconductor acceleration sensor and detects longitudinal G and tilt angle of the vehicle based on gravitational acceleration.
In addition, the G sensor converts a detected tilt angle into an electric signal and transmits it to Engine Control Module (ECM).

OBDII Code P159A - G Sensor Circuit - AutoCodes.com — P159A Code - G Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P159A?

Faulty G Sensor
G Sensor harness is open or shorted
G Sensor circuit poor electrical connection

How to Fix the DTC P159A?

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 P159A 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.

Need more information about the P159A code?

Need more information on how to fix the P159A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P159A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P159A BMW — Idle Air Control Actuator 2 Limp Home Mode Initiated
P159A Infiniti — G Sensor Circuit
P159A MINI — Idle Air Control Actuator 2 Limp Home Mode Initiated
P159A Nissan — G Sensor Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P159A Code

1. What are the common symptoms of OBDII code P159A (G Sensor Circuit)?

The common symptoms of code P159A include issues with vehicle stability control, traction control, or the anti-lock braking system (ABS) functionality.

2. What can cause the OBDII code P159A to trigger?

The OBDII code P159A (G Sensor Circuit) is often triggered by a malfunction in the G sensor circuit, which measures the vehicle's lateral and longitudinal acceleration.

3. How serious is the OBDII code P159A?

While the severity of code P159A can vary, it is important to address this issue promptly to ensure proper functioning of the vehicle's safety systems.

4. How can I diagnose the OBDII code P159A at home?

Diagnosing code P159A typically involves checking the wiring and connections related to the G sensor circuit, as well as testing the sensor itself for proper operation.

5. Can I continue driving with the OBDII code P159A present?

It is not recommended to continue driving with the OBDII code P159A illuminated, as it may affect the performance of safety systems such as stability control and ABS.

6. How much does it cost to repair OBDII code P159A?

The cost of repairing code P159A can vary depending on the underlying cause of the issue, but it may involve replacing the G sensor or addressing wiring issues.

7. Are there any DIY repair tips for fixing the OBDII code P159A?

DIY repair tips for code P159A may include checking and cleaning the sensor connections, inspecting wiring for damage, and ensuring proper sensor calibration.

8. Can a faulty G sensor cause other issues besides triggering code P159A?

Yes, a faulty G sensor can potentially cause other issues such as inaccurate vehicle stability control, traction control, or ABS operation.

9. How long does it typically take to repair OBDII code P159A?

The repair time for code P159A can vary depending on the extent of the issue, but it may take a few hours to a day to diagnose and fix the problem.

10. Is it necessary to clear the OBDII code P159A after repairs are made?

Yes, it is important to clear the OBDII code P159A after repairs are made to reset the vehicle's diagnostic system and ensure the issue has been resolved.