AutoCodes – Generic – P1691

P1691 Code - Fuel Injection Pump Controller Calibration Error

Quick Answer

P1691 indicates Fuel Injection Pump Controller Calibration Error. Common causes include AC Noise Across Fuel Transfer Pump, Other DTCs Present, Wiring & Connectors. 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: P1691 indicates Fuel Injection Pump Controller Calibration Error.
Common causes: Common causes include AC Noise Across Fuel Transfer Pump, Other DTCs Present, Wiring & Connectors.
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 23,536

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 Sep 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1691 Description

OBDII Code P1691 - Fuel Injection Pump Controller Calibration Error - AutoCodes.com — P1691 Code - Fuel Injection Pump Controller Calibration Error

What does this mean?

What are the Possible Causes of the DTC P1691?

AC Noise Across Fuel Transfer Pump
Other DTCs Present
Wiring & Connectors
Fuel Injection Pump Static Timing
Fuel Sync Signal Circuit Open
Fuel Sync Signal Circuit Short To Ground
Engine Control Module (ECM)

How to Fix the DTC P1691?

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 P1691 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 P1691 code?

Need more information on how to fix the P1691 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1691 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1691 Audi — Malfunction Indicator Lamp Open Circuit
P1691 Buick — Coolant Gauge Circuit Conditions
P1691 Cadillac — Coolant Gauge Circuit Conditions
P1691 Chevrolet — Coolant Gauge Circuit Conditions
P1691 Chrysler — Fuel Injection Pump Controller Calibration Error
P1691 Dodge — Fuel Injection Pump Controller Calibration Error
P1691 GMC — Coolant Gauge Circuit Conditions
P1691 Hyundai — Immobilizer Antenna Error
P1691 Volkswagen — Malfunction Indicator Lamp Open Circuit

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 P1691 Code

1. What are the common symptoms of OBDII code P1691 (Fuel Injection Pump Controller Calibration Error)?

- Common symptoms include rough idle, misfiring, decreased engine performance, and potentially stalling.

2. What can cause OBDII code P1691 to trigger?

- This code is typically triggered by a calibration error in the fuel injection pump controller, which can be caused by electrical issues or a faulty controller.

3. How serious is a P1691 fault code?

- A P1691 fault code should be addressed promptly as it can lead to poor engine performance and potential stalling, which may compromise driving safety.

4. How can I diagnose the cause of OBDII code P1691?

- Diagnosing the cause of P1691 may involve checking the wiring and connections to the fuel injection pump controller, as well as testing the controller itself for faults.

5. Can I drive my vehicle with the P1691 fault code?

- It is not recommended to drive the vehicle with the P1691 fault code, as it can lead to further damage to the engine and potential safety risks.

6. How can I repair OBDII code P1691?

- Repairing P1691 may involve resetting the fuel injection pump controller calibration, repairing any wiring or connection issues, or replacing the fuel injection pump controller if necessary.

7. Can a DIY enthusiast fix OBDII code P1691?

- While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing the root cause of P1691 may require professional automotive knowledge and tools.

8. Are there any preventative measures to avoid OBDII code P1691?

- Regular maintenance, such as checking and cleaning electrical connections, can help prevent calibration errors in the fuel injection pump controller that trigger P1691.

9. How much does it cost to repair OBDII code P1691?

- The cost of repairing P1691 can vary depending on the root cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

10. Can resetting the fault code clear OBDII code P1691 permanently?

- Resetting the fault code may temporarily clear P1691, but if the underlying issue causing the calibration error in the fuel injection pump controller is not addressed, the code is likely to reappear.