AutoCodes – Generic – P16A4

P16A4 Code - Engine Control Module Internal Malfunction

Quick Answer

The Engine Control Module (ECM) monitors it's internal Electrically Erasable Programmable Read-Only Memory (EEPROM). Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: P16A4 indicates Engine Control Module Internal Malfunction.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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 19,422

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 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16A4 Description

The Engine Control Module (ECM) monitors it's internal Electrically Erasable Programmable Read-Only Memory (EEPROM). The ECM sets the OBDII code when the internal (EPROM is not to factory specifications.

OBDII Code P16A4 - Engine Control Module Internal Malfunction - AutoCodes.com — P16A4 Code - Engine Control Module Internal Malfunction

What does this mean?

What are the Possible Causes of the DTC P16A4?

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

How to Fix the DTC P16A4?

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 P16A4 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 P16A4 code?

Need more information on how to fix the P16A4 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16A4 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P16A4 Acura — Engine Control Module Internal Malfunction
P16A4 BMW — Time Out Control Module Knock Sensor Bus
P16A4 Honda — Engine Control Module Internal Malfunction
P16A4 MINI — Time Out Control Module Knock Sensor Bus

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 P16A4 Code

1. What are the common symptoms of OBDII code P16A4 (Engine Control Module Internal Malfunction)?

- Common symptoms include check engine light illumination, engine performance issues, and potential stalling or rough idling.

2. What are the possible causes of OBDII code P16A4?

- The code P16A4 can be caused by issues such as a faulty engine control module (ECM), damaged wiring, poor electrical connections, or software glitches.

3. How can I diagnose the OBDII code P16A4?

- Diagnosis typically involves using an OBDII scanner to read the code, checking for related symptoms, inspecting wiring and connections, and potentially testing the ECM.

4. Is it safe to continue driving with OBDII code P16A4 present?

- It is generally not recommended to drive with the code P16A4 present, as it can lead to further engine damage or performance issues.

5. How can I repair OBDII code P16A4?

- Repairing the code P16A4 may involve replacing the ECM, repairing damaged wiring or connections, updating software, or seeking assistance from a professional mechanic.

6. Can a DIY enthusiast fix OBDII code P16A4?

- While some minor repairs related to the code P16A4 may be possible for experienced DIY enthusiasts, it is recommended to seek professional help for diagnosing and repairing this issue.

7. Are there any quick fixes or temporary solutions for OBDII code P16A4?

- Quick fixes for the code P16A4 are generally not recommended, as addressing the root cause of the issue is essential for long-term vehicle health and safety.

8. How much does it typically cost to repair OBDII code P16A4?

- The cost of repairing the code P16A4 can vary depending on the extent of the issue, the needed repairs, and the labor rates of the mechanic or repair shop.

9. Can OBDII code P16A4 cause damage to other vehicle components?

- If left unresolved, the code P16A4 can potentially cause damage to other engine components or lead to more severe performance issues over time.

10. Does resetting the OBDII code P16A4 clear the issue permanently?

- Resetting the code may temporarily clear the check engine light, but if the root cause of the issue is not addressed, the code is likely to reappear.