AutoCodes – Fiat – P1D66 Fiat

P1D66 Fiat Code - Cylinder 2 Oil Supply Solenoid Valve Performance

Quick Answer

Multi-Air is an electronically controlled variable intake valve phase and lift system. Common causes include Faulty Variable Valve Actuator (VVA) Solenoid, Variable Valve Actuator Solenoid harness is open or shorted, Variable Valve Actuator Solenoid 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: P1D66 Fiat indicates Cylinder 2 Oil Supply Solenoid Valve Performance.
Common causes: Common causes include Faulty Variable Valve Actuator (VVA) Solenoid, Variable Valve Actuator Solenoid harness is open or shorted, Variable Valve Actuator Solenoid 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 411

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1D66 Fiat Description

Multi-Air is an electronically controlled variable intake valve phase and lift system. Unlike conventional intake valve phase and lift system which controls all the cylinder intake valves simultaneously and in the same proportion; Multi-Air, through the use of an electronically controlled hydraulic link between the camshaft and intake valve, allows for each intake valve to be controlled independently. The valve lift and timing can be adjusted infinitely.
The Multi-Air valve train has a mechanical camshaft lobe acting on a hydraulic pump located between the camshaft intake lobe and the intake valve. The pump provides oil under pressure to a two-way electro-hydraulic solenoid valve called the Variable Valve Actuator (VVA) Solenoid. The VVA Solenoid is electronically controlled during the specific intake cam lobe event by the Powertrain Control Module (PCM). During the event, the VVA Solenoid is commanded to either hold oil pressure or bleed oil. The VVA Solenoid is a normally open solenoid. The PCM provides 12 volts to close the solenoid. The position of the VVA Solenoid determines the intake valve timing and lift. This change on valve action is similar to creating a change in the camshaft lobe profile affecting the lift and duration of the valve opening.
The Diagnostic Trouble Code (DTC) will be set when the PCM detects a short circuit condition between the VVA Solenoid Control return circuit and the VVA Solenoid Control signal circuit.

OBDII Code P1D66 Fiat - Cylinder 2 Oil Supply Solenoid Valve Performance - AutoCodes.com — P1D66 Fiat Code - Cylinder 2 Oil Supply Solenoid Valve Performance

What does this mean?

What are the Possible Causes of the DTC P1D66 Fiat?

Faulty Variable Valve Actuator (VVA) Solenoid
Variable Valve Actuator Solenoid harness is open or shorted
Variable Valve Actuator Solenoid circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1D66 Fiat?

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 P1D66 Fiat 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 P1D66 Fiat code?

Need more information on how to fix the P1D66 Fiat code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1D66 Fiat 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 P1D66 Fiat Code

1. What are the common symptoms of OBDII code P1D66 in a Fiat related to the Cylinder 2 Oil Supply Solenoid Valve Performance?

The common symptoms include rough idling, loss of power, engine misfires, and potential stalling.

2. What are the possible causes of OBDII code P1D66 in a Fiat indicating an issue with the Cylinder 2 Oil Supply Solenoid Valve?

Potential causes may include a faulty solenoid valve, wiring issues, low oil pressure, or a clogged oil passage.

3. How can I diagnose the Cylinder 2 Oil Supply Solenoid Valve performance issue triggering OBDII code P1D66 in my Fiat?

Diagnosis typically involves checking the solenoid valve for proper operation, inspecting the wiring for damage, verifying oil pressure, and ensuring the oil passages are clear.

4. Is it safe to continue driving my Fiat with OBDII code P1D66 related to the Cylinder 2 Oil Supply Solenoid Valve Performance issue?

It is not recommended to drive the vehicle with this code active, as it can lead to further engine damage or issues if left unresolved.

5. Can I repair the Cylinder 2 Oil Supply Solenoid Valve issue triggering OBDII code P1D66 in my Fiat myself?

While some DIY enthusiasts may be able to address the issue by replacing the solenoid valve or checking the wiring, it is recommended to seek professional help for an accurate diagnosis and repair.

6. How much does it typically cost to repair OBDII code P1D66 in a Fiat caused by Cylinder 2 Oil Supply Solenoid Valve Performance problems?

The cost of repair can vary depending on the exact cause of the issue, but it may involve part replacement, labor costs, and potentially system flushes or other related services.

7. Are there any preventive maintenance steps I can take to avoid encountering OBDII code P1D66 related to the Cylinder 2 Oil Supply Solenoid Valve in my Fiat?

Regular oil changes, using high-quality oil, and following the manufacturer's recommended maintenance schedule can help prevent issues with the solenoid valve and oil supply system.

8. How urgent is it to address OBDII code P1D66 in a Fiat linked to Cylinder 2 Oil Supply Solenoid Valve Performance problems?

It is important to address this issue promptly to prevent further damage to the engine and ensure the vehicle operates safely and efficiently.

9. Are there any recalls or technical service bulletins related to OBDII code P1D66 and the Cylinder 2 Oil Supply Solenoid Valve issue in Fiat vehicles?

It's recommended to check with your local Fiat dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to this specific problem.

10. Can a faulty Cylinder 2 Oil Supply Solenoid Valve triggering OBDII code P1D66 affect the overall performance and fuel efficiency of my Fiat?

Yes, a malfunctioning solenoid valve can impact engine performance, fuel efficiency, and overall drivability of the vehicle, making it essential to address the issue promptly.