AutoCodes – Generic – P2691

P2691 Code - Cylinder 6 Injector Data Incompatible

Quick Answer

Each injector has a code stored in Electrically Erasable Programmable Read-Only Memory (EEPROM) that provides information to the Electronic Control Unit (ECU) about deviations of that injector from a theoretical average injector. Common causes include Program Injector. 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 indicates Cylinder 6 Injector Data Incompatible.
Common causes: Common causes include Program Injector.
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 8,311

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 26, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2691 Description

Each injector has a code stored in Electrically Erasable Programmable Read-Only Memory (EEPROM) that provides information to the Electronic Control Unit (ECU) about deviations of that injector from a theoretical average injector. The Powertrain Control Module (PCM) sets the OBDII code if the injector code is missing or invalid.

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

What does this mean?

What are the Possible Causes of the DTC P2691?

Program Injector

How to Fix the DTC P2691?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

P2691 Buick — Cylinder 6 Injector Data Incompatible
P2691 Cadillac — Cylinder 6 Injector Data Incompatible
P2691 Chevrolet — Cylinder 6 Injector Data Incompatible
P2691 Dodge — Cylinder 6 Injector Data Incompatible
P2691 Ford — Cylinder 6 Injector Data Incompatible
P2691 GMC — Cylinder 6 Injector Data Incompatible

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 Code

1. What are the common symptoms of OBDII code P2691 (Cylinder 6 Injector Data Incompatible)?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and the illumination of the check engine light.

2. What can cause OBDII code P2691 to trigger?

- This code can be triggered by issues such as a faulty fuel injector, wiring problems, a malfunctioning Engine Control Module (ECM), or incorrect injector calibration data.

3. How can I diagnose the cause of OBDII code P2691?

- Diagnosing the cause typically involves conducting a thorough inspection of the cylinder 6 fuel injector, checking the wiring connections, and using a diagnostic scanner to analyze the injector data.

4. What are the potential repair options for OBDII code P2691?

- Repair options may include replacing the faulty fuel injector, repairing any damaged wiring, reprogramming the ECM, or updating the injector calibration data.

5. Can I drive my vehicle with OBDII code P2691 active?

- It is not recommended to drive with this code active, as it can lead to engine performance issues and potential damage if left unresolved. It's best to address the underlying problem promptly.

6. How much does it typically cost to repair OBDII code P2691?

- The cost of repairs can vary depending on the specific cause of the code and the labor rates in your area. It's advisable to consult with a qualified mechanic for an accurate estimate.

7. Are there any preventive maintenance measures to avoid OBDII code P2691 in the future?

- Regularly servicing and inspecting your vehicle, including the fuel system components, can help prevent issues that may trigger this code. Using high-quality fuel and following the manufacturer's maintenance schedule is also recommended.

8. Can a DIY enthusiast fix OBDII code P2691 at home?

- While some basic troubleshooting steps can be performed at home, diagnosing and repairing this code often requires specialized tools and expertise. It's best to consult a professional mechanic for proper diagnosis and repair.

9. Is it safe to clear the OBDII code P2691 without fixing the underlying issue?

- Clearing the code without addressing the underlying problem may temporarily turn off the check engine light, but it won't fix the root cause. Ignoring the issue can lead to further damage and potentially more costly repairs.

10. How long does it take to repair OBDII code P2691?

- The repair time can vary based on the cause of the code, the availability of parts, and the expertise of the mechanic. Some repairs can be completed within a few hours, while others may take longer, so it's best to inquire with your mechanic.