AutoCodes – Chevrolet – P16A7 Chevrolet

P16A7 Chevrolet Code - Engine Controls Ignition Relay Feedback Circuit 2

Quick Answer

There are 3 ignition voltage circuits supplied to the Engine Control Module (ECM). Common causes include Faulty Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay 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: P16A7 Chevrolet indicates Engine Controls Ignition Relay Feedback Circuit 2.
Common causes: Common causes include Faulty Engine Controls Ignition Relay, Engine Controls Ignition Relay harness is open or shorted, Engine Controls Ignition Relay 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 10,214

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 Aug 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16A7 Chevrolet Description

There are 3 ignition voltage circuits supplied to the Engine Control Module (ECM). Two are supplied by the engine controls ignition relay, and the other is supplied by the ignition main relay. The ECM monitors and compares the ignition voltage supplied by the 2 relays. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the voltage level difference is greater than 3 V between the 2 ignition voltage circuits for greater than 1 s.

OBDII Code P16A7 Chevrolet - Engine Controls Ignition Relay Feedback Circuit 2 - AutoCodes.com — P16A7 Chevrolet Code - Engine Controls Ignition Relay Feedback Circuit 2

What does this mean?

What are the Possible Causes of the DTC P16A7 Chevrolet?

Faulty Engine Controls Ignition Relay
Engine Controls Ignition Relay harness is open or shorted
Engine Controls Ignition Relay circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P16A7 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 P16A7 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 P16A7 Chevrolet code?

Need more information on how to fix the P16A7 Chevrolet code? Get Access to Factory Service Manuals

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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 P16A7 Chevrolet Code

1. What are common symptoms of OBDII code P16A7 in a Chevrolet related to the Engine Controls Ignition Relay Feedback Circuit 2?

- Common symptoms include rough idling, engine stalling, poor acceleration, and potential failure to start.

2. What are possible causes of OBDII code P16A7 in a Chevrolet?

- Possible causes include a faulty ignition relay, damaged wiring or connectors in the feedback circuit, or a malfunctioning engine control module.

3. How can I diagnose the OBDII code P16A7 in my Chevrolet?

- You can diagnose this code by performing a thorough inspection of the ignition relay, checking the wiring and connectors for any damage, and using a diagnostic scan tool to identify the specific issue.

4. Can I still drive my Chevrolet with OBDII code P16A7 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further engine damage or safety hazards. It is best to address the issue promptly.

5. How do I repair OBDII code P16A7 in my Chevrolet?

- The repair process may involve replacing the faulty ignition relay, repairing any damaged wiring or connectors, or reprogramming the engine control module to resolve the issue.

6. Will resetting the OBDII code P16A7 in my Chevrolet make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem.

7. Are there any precautions I should take when working on OBDII code P16A7 in my Chevrolet?

- It is recommended to disconnect the battery before working on any electrical components to prevent damage or injury. Additionally, following proper diagnostic procedures is crucial for an accurate repair.

8. Can a DIY enthusiast fix OBDII code P16A7 in a Chevrolet, or should I seek professional help?

- While some DIY enthusiasts may be able to diagnose and repair this code, it is recommended to seek professional help if you are not experienced with automotive electrical systems to ensure a proper fix.

9. What is the typical cost to repair OBDII code P16A7 in a Chevrolet at a mechanic or dealership?

- The cost to repair this code can vary depending on the specific issue and labor rates, but it may range from $100 to $300 for parts and labor at a mechanic or dealership.

10. How often does OBDII code P16A7 occur in Chevrolet vehicles, and is it a common issue?

- This code is relatively uncommon compared to other OBDII codes, but it can still occur in Chevrolet vehicles due to various factors such as electrical faults or component wear over time.