AutoCodes – Cadillac – P2066 Cadillac

P2066 Cadillac Code - Fuel Level Sensor 2 Performance

Quick Answer

The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor circuit poor electrical connection. 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: P2066 Cadillac indicates Fuel Level Sensor 2 Performance.
Common causes: Common causes include Faulty Fuel Level Sensor, Fuel Level Sensor harness is open or shorted, Fuel Level Sensor circuit poor electrical connection.
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 815

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 Jun 29, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2066 Cadillac Description

The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The Engine Control Module (ECM) monitors the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to determine the fuel level. When the fuel tank is full, the resistances of both fuel level sensors are low, and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sensor and the secondary fuel level sensor. When the fuel tank is empty, the resistances of the fuel level sensors are high, and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via the serial data circuit to the instrument cluster in order to control the fuel gauge.
The Diagnostic Trouble Code (DTC) will be set if the ECM detects a change in fuel level of less than a specified amount (typically 3 - 10 L or 0.8 - 2.6 gal) over

OBDII Code P2066 Cadillac - Fuel Level Sensor 2 Performance - AutoCodes.com — P2066 Cadillac Code - Fuel Level Sensor 2 Performance

What does this mean?

What are the Possible Causes of the DTC P2066 Cadillac?

Faulty Fuel Level Sensor
Fuel Level Sensor harness is open or shorted
Fuel Level Sensor circuit poor electrical connection
Faulty Instrument Cluster
Faulty Engine Control Module (ECM)

How to Fix the DTC P2066 Cadillac?

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

A low fuel level can trigger this code. Before replacing any parts, try filling up the fuel tank and erasing the engine code. If the problem persists, it may be necessary to replace the fuel level sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2066 Cadillac 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 P2066 Cadillac code?

Need more information on how to fix the P2066 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2066 Cadillac 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 P2066 Cadillac Code

1. What are common symptoms of OBDII code P2066 in a Cadillac related to Fuel Level Sensor 2 Performance?

- Common symptoms include inaccurate fuel level readings on the dashboard, fluctuating fuel gauge, and potential stalling issues.

2. What could cause the OBDII code P2066 to appear in a Cadillac?

- The code P2066 typically indicates a problem with the fuel level sensor 2, which may be caused by a faulty sensor, wiring issues, or a problem with the fuel tank itself.

3. How can I diagnose the issue causing OBDII code P2066 in my Cadillac?

- To diagnose the issue, you can use a diagnostic scan tool to read the code, inspect the fuel level sensor wiring for any damage, and test the sensor's resistance to determine if it is functioning correctly.

4. Can I still drive my Cadillac with the OBDII code P2066 present?

- It is not recommended to drive the vehicle with the code P2066 as it can lead to inaccurate fuel level readings, potentially causing you to run out of fuel unexpectedly.

5. What are some repair tips for fixing OBDII code P2066 in a Cadillac?

- Repair tips include replacing the faulty fuel level sensor 2, repairing any damaged wiring, ensuring proper connection of the sensor, and clearing the fault code with a scan tool.

6. How much does it typically cost to repair OBDII code P2066 related to Fuel Level Sensor 2 Performance in a Cadillac?

- The cost of repair can vary depending on the extent of the issue, but replacing the fuel level sensor 2 in a Cadillac can range from $150 to $300, including parts and labor.

7. Can a DIY enthusiast fix OBDII code P2066 in a Cadillac, or is it better to take it to a professional mechanic?

- While some DIY enthusiasts may be able to replace the fuel level sensor 2 themselves, it is recommended to consult a professional mechanic for accurate diagnosis and repair to ensure the issue is properly resolved.

8. Are there any preventive measures to avoid OBDII code P2066 in a Cadillac related to Fuel Level Sensor 2 Performance?

- Regularly checking the fuel level gauge for accuracy, avoiding overfilling the fuel tank, and addressing any fuel system issues promptly can help prevent the occurrence of code P2066.

9. How urgent is it to address OBDII code P2066 in a Cadillac?

- While the vehicle may still be operable with the code present, it is important to address OBDII code P2066 promptly to avoid potential fuel-related issues and ensure accurate fuel level readings.

10. Is OBDII code P2066 related to Fuel Level Sensor 2 Performance a common issue in Cadillacs?

- Yes, OBDII code P2066 related to Fuel Level Sensor 2 Performance is a known issue in Cadillacs, particularly in older models, and can occur due to sensor wear or electrical faults.