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Engine-Codes – Generic – P1690

P1690 Code - Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor

Quick Answer

The P1690 code indicates that there is a disagreement between the Fuel Injection Pump Crankshaft Position (CKP) sensor and the Engine Control Module (ECM) CKP sensor. Common causes include Faulty CKP sensor, Wiring or connection issues, ECM malfunction. 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
P1690 indicates Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor.
Common causes
Common causes include Faulty CKP sensor, Wiring or connection issues, ECM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P1690 Description

The P1690 code indicates that there is a disagreement between the Fuel Injection Pump Crankshaft Position (CKP) sensor and the Engine Control Module (ECM) CKP sensor. The CKP sensor is responsible for monitoring the position and speed of the crankshaft, which is crucial for the proper functioning of the fuel injection system. When these sensors do not agree, it can lead to issues with fuel delivery, ignition timing, and overall engine performance. This discrepancy can result in rough idling, poor acceleration, misfires, and even stalling. Ignoring this code can potentially cause damage to the engine and other components over time.

OBDII Code P1690 - Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor
P1690 Code - Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor

Common Causes of P1690

  1. Faulty CKP sensor
  2. Wiring or connection issues
  3. ECM malfunction
  4. Incorrect sensor installation
  5. Mechanical issues with the crankshaft

Symptoms of P1690

  1. Rough idling
  2. Poor acceleration
  3. Engine misfires
  4. Stalling
  5. Check Engine Light illuminated

How to Fix P1690

  1. Perform a thorough inspection of the CKP sensors and wiring for any damage or loose connections.
  2. Test the CKP sensors using a multimeter to determine if they are functioning properly.
  3. Check the ECM for any fault codes and reset if necessary.
  4. Replace any faulty CKP sensors or repair/replace any damaged wiring.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1690

The cost of repairing a P1690 code can vary depending on the exact cause of the issue. In general, the cost of replacing a CKP sensor can range from $100 to $300, including parts and labor. Additional costs may be incurred if wiring needs to be repaired or if other components need to be replaced. It is recommended to consult with a mechanic to get an accurate estimate based on your specific vehicle.

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Code P1690 Information for Specific Makes

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 P1690 Code

1. What are the common symptoms of OBDII code P1690?

- Common symptoms include hard starting, rough idling, loss of power, and stalling while driving.

2. What are some possible causes of the Fuel Injection Pump CKP Sensor disagreement with the ECM CKP Sensor?

- Possible causes include a faulty CKP sensor, wiring issues, a malfunctioning ECM, or problems with the fuel injection pump.

3. How can I diagnose the source of the issue related to code P1690?

- Diagnosis typically involves checking the CKP sensor readings, inspecting the wiring for damage, and testing the fuel injection pump.

4. Can I drive my vehicle with OBDII code P1690?

- It is not recommended to drive your vehicle with this code as it can lead to further damage and potential safety hazards.

5. What are some repair tips for fixing the Fuel Injection Pump CKP Sensor disagreement?

- Repair tips may include replacing the CKP sensor, repairing damaged wiring, recalibrating the ECM, or servicing the fuel injection pump.

6. How much does it cost to repair OBDII code P1690?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $500 or more.

7. Can I reset the code P1690 without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is important to address the underlying problem to prevent further issues.

8. Will the Check Engine light turn off on its own after fixing the problem related to code P1690?

- In most cases, the Check Engine light will turn off after the issue is resolved and the vehicle goes through a few drive cycles.

9. Is it possible to prevent OBDII code P1690 from occurring in the future?

- Regular maintenance, such as checking and replacing sensors as needed, can help prevent the recurrence of this code.

10. Can a DIY enthusiast fix OBDII code P1690 at home?

- Depending on your skill level and access to tools, you may be able to address this code at home, but professional help is recommended for more complex issues.

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