P1691 Code - Fuel Injection Pump Controller Calibration Error
Quick Answer
The P1691 diagnostic trouble code indicates that there is a fuel injection pump controller calibration error in the vehicle's engine control module. Common causes include Corrupted or incorrect calibration values in the fuel injection pump controller, Faulty wiring or connectors in the fuel injection pump controller circuit, Issues with the engine control module communication. 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 Corrupted or incorrect calibration values in the fuel injection pump controller, Faulty wiring or connectors in the fuel injection pump controller circuit, Issues with the engine control module communication.
- 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 P1691 Description
The P1691 diagnostic trouble code indicates that there is a fuel injection pump controller calibration error in the vehicle's engine control module. This error usually occurs when the calibration values stored in the fuel injection pump controller do not match the values expected by the engine control module. This discrepancy can lead to improper fuel delivery, affecting the engine's performance and efficiency.
Common Causes of P1691
- Corrupted or incorrect calibration values in the fuel injection pump controller
- Faulty wiring or connectors in the fuel injection pump controller circuit
- Issues with the engine control module communication
- Mechanical issues with the fuel injection pump itself
- Electrical interference or grounding problems
Symptoms of P1691
- Rough idling
- Hesitation or lack of responsiveness
- Reduced power output
- Poor fuel economy
- Stalling or difficulty starting the engine
How to Fix P1691
- Use a diagnostic scan tool to retrieve the error code and identify the specific calibration error in the fuel injection pump controller.
- Inspect the wiring and connectors in the fuel injection pump controller circuit for any damage or corrosion. Repair or replace as necessary.
- Verify the calibration values stored in the fuel injection pump controller and reprogram them to match the values expected by the engine control module.
- Test the vehicle to ensure that the calibration error has been resolved and that the engine is running smoothly without any performance issues.
- Clear the error code from the engine control module memory using the diagnostic scan tool.
Cost to Fix P1691
The typical repair costs for addressing a fuel injection pump controller calibration error can vary depending on the extent of the issue and the specific repairs needed. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's best to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your specific circumstances.
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Code P1691 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
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.
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