AutoCodes – Chevrolet – P15A0 Chevrolet

P15A0 Chevrolet Code - Fuel Economy Mode Switch Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) supplies 5 V reference voltage, through the 5 V reference voltage circuit, to the S87 fuel economy mode switch. Common causes include Faulty Fuel Economy Mode Switch, Fuel Economy Mode Switch harness is open or shorted, Fuel Economy Mode Switch 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: P15A0 Chevrolet indicates Fuel Economy Mode Switch Circuit High Voltage.
Common causes: Common causes include Faulty Fuel Economy Mode Switch, Fuel Economy Mode Switch harness is open or shorted, Fuel Economy Mode Switch 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 9,761

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 P15A0 Chevrolet Description

The Engine Control Module (ECM) supplies 5 V reference voltage, through the 5 V reference voltage circuit, to the S87 fuel economy mode switch. The 5 V reference voltage causes current to flow through a series of resistors in the switch to the switch ground circuit. The ECM monitors the reference voltage through a discrete fuel economy mode switch signal circuit. When the switch button is momentarily pressed, the switch contacts allow the 5 V reference voltage to by-pass one of the resistors. The ECM detects the resulting voltage drop as a fuel economy mode request and sends a GMLAN message to the Transmission Control Module (TCM) indicating the request. When the TCM receives the request, throttle progressions and transmission shift points are modified to optimize fuel efficiency. The Instrument Panel Cluster (IPC) also receives the fuel economy mode request message from the ECM and illuminates the fuel economy mode indicator lamp. The fuel economy mode switch must be pressed for between 0.094-1.5 s to activate the fuel economy mode.

OBDII Code P15A0 Chevrolet - Fuel Economy Mode Switch Circuit High Voltage - AutoCodes.com — P15A0 Chevrolet Code - Fuel Economy Mode Switch Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P15A0 Chevrolet?

Faulty Fuel Economy Mode Switch
Fuel Economy Mode Switch harness is open or shorted
Fuel Economy Mode Switch circuit poor electrical connection

How to Fix the DTC P15A0 Chevrolet?

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 P15A0 Chevrolet 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 P15A0 Chevrolet code?

Need more information on how to fix the P15A0 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P15A0 Chevrolet Code

1. What does the OBDII code P15A0 on a Chevrolet indicate?

The code P15A0 on a Chevrolet indicates a Fuel Economy Mode Switch Circuit High Voltage issue.

2. What are the common symptoms of the P15A0 code on a Chevrolet?

Common symptoms of the P15A0 code on a Chevrolet may include poor fuel economy, reduced engine performance, and the illuminated check engine light.

3. What are the potential causes of the P15A0 code on a Chevrolet?

Potential causes of the P15A0 code on a Chevrolet include a faulty fuel economy mode switch, damaged wiring or connectors in the circuit, or a malfunctioning PCM (powertrain control module).

4. How can I diagnose the P15A0 code on my Chevrolet?

Diagnosing the P15A0 code on your Chevrolet may involve using an OBDII scanner to retrieve the code, inspecting the fuel economy mode switch and its wiring for any visible damage, and testing the circuit for continuity and proper voltage.

5. Can I still drive my Chevrolet with the P15A0 code present?

It is generally not recommended to drive your Chevrolet with the P15A0 code present, as it can lead to decreased fuel efficiency and potential engine performance issues.

6. How can I repair the P15A0 code on my Chevrolet?

Repairing the P15A0 code on your Chevrolet may involve replacing the fuel economy mode switch, repairing or replacing damaged wiring or connectors, and clearing the code with an OBDII scanner.

7. Can I reset the P15A0 code on my Chevrolet without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the P15A0 code to prevent further problems.

8. How much does it cost to fix the P15A0 code on a Chevrolet?

The cost to fix the P15A0 code on a Chevrolet can vary depending on the specific cause of the issue, parts needed for repair, and labor costs at a repair shop.

9. Is the P15A0 code a serious issue on a Chevrolet?

While the P15A0 code may not cause immediate harm to your Chevrolet, it can impact fuel efficiency and engine performance if left unresolved.

10. Can a DIY enthusiast fix the P15A0 code on a Chevrolet?

A DIY enthusiast with the necessary tools and knowledge of automotive repair may be able to fix the P15A0 code on a Chevrolet, especially if the issue is with the fuel economy mode switch or wiring.