AutoCodes – Buick – P2691 Buick

P2691 Buick Code - Cylinder 6 Injector Data Incompatible

Quick Answer

The control functions for the fuel injection system are integrated into the Engine Control Module (ECM). Common causes include Program Injector, Faulty Engine Control Module (ECM). 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: P2691 Buick indicates Cylinder 6 Injector Data Incompatible.
Common causes: Common causes include Program Injector, Faulty Engine Control Module (ECM).
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 286

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 01, 2021

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P2691 Buick Description

The control functions for the fuel injection system are integrated into the Engine Control Module (ECM). Each injector's flow rate information and cylinder position are stored in the memory of both the Glow Plug Control Module (GPCM) and the ECM. The fuel injector flow rate programming must be done when any of the following procedures are performed: The ECM is replaced, the GPCM is replaced, or any fuel injectors are replaced.
If the ECM does not communicate, the flow rate information can be retrieved from the GPCM. If both control modules fail to communicate, the fuel injector flow rate information, or Injection Quantity Adjustment (IQA) flow rate numbers, will need to be retrieved from each injector. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the end of line injector adjustment code for cylinder 1 to 8 has not been programmed successfully after injector replacement.

OBDII Code P2691 Buick - Cylinder 6 Injector Data Incompatible - AutoCodes.com — P2691 Buick Code - Cylinder 6 Injector Data Incompatible

What does this mean?

What are the Possible Causes of the DTC P2691 Buick?

Program Injector
Faulty Engine Control Module (ECM)

How to Fix the DTC P2691 Buick?

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 does this mean?

Code Tech Notes

Programming Injector must perform with an OBDII scanner capable of programming injectors.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2691 Buick 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 P2691 Buick code?

Need more information on how to fix the P2691 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2691 Buick code diagnosed by a professional: Find a repair shop in your area

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 P2691 Buick Code

1. What are the common symptoms of OBDII code P2691 in a Buick related to Cylinder 6 Injector Data Incompatible?

- The common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potentially a noticeable decrease in overall engine performance.

2. What are some potential causes of the OBDII code P2691 in a Buick?

- Possible causes include a faulty fuel injector in cylinder 6, incorrect data being sent to the engine control module (ECM), wiring issues, or a malfunctioning ECM.

3. How can I diagnose the issue causing OBDII code P2691 in my Buick?

- It is recommended to perform a thorough inspection of the fuel injector in cylinder 6, check for any wiring issues or loose connections, and use a diagnostic scan tool to further pinpoint the exact cause.

4. Can I continue driving my Buick with OBDII code P2691 present?

- It is not advisable to continue driving the vehicle with this code active, as it can lead to further damage to the engine and potentially result in more costly repairs.

5. What are some repair tips for addressing OBDII code P2691 in a Buick?

- Repair tips may include replacing the fuel injector in cylinder 6, checking and repairing any wiring issues, and resetting the ECM to clear the error code.

6. Is it possible to reset the OBDII code P2691 in my Buick without addressing the underlying issue?

- While you can clear the error code temporarily, it is crucial to address the root cause to prevent the issue from recurring and potentially causing more severe problems.

7. How much does it typically cost to repair OBDII code P2691 in a Buick?

- Repair costs can vary depending on the exact cause of the issue, but it may involve the cost of a new fuel injector, potential wiring repairs, and labor fees, which can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast address OBDII code P2691 in a Buick, or is it best left to a professional mechanic?

- While some experienced DIY enthusiasts may be able to tackle this repair, it is recommended to consult with a professional mechanic due to the complexity of diagnosing and fixing issues related to fuel injectors and engine control modules.

9. How long does it typically take to repair OBDII code P2691 in a Buick?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose, replace parts, and clear the error code.

10. Are there any preventative measures to avoid encountering OBDII code P2691 in a Buick in the future?

- Regular maintenance, such as fuel system cleanings and using high-quality fuel, can help prevent issues with fuel injectors and potentially reduce the risk of encountering this specific error code in the future.