AutoCodes – Generic – P1D66

P1D66 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 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 317

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

What does this mean?

What are the Possible Causes of the DTC P1D66?

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?

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 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 code?

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Information for Specific Makes

P1D66 Chrysler — Cylinder 2 Oil Supply Solenoid Valve Performance
P1D66 Dodge — Cylinder 2 Oil Supply Solenoid Valve Performance
P1D66 Fiat — Cylinder 2 Oil Supply Solenoid Valve Performance
P1D66 Jeep — Cylinder 2 Oil Supply Solenoid Valve Performance

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 Code

1. What does the OBDII code P1D66 mean?

P1D66 refers to a Cylinder 2 Oil Supply Solenoid Valve Performance issue, indicating a problem with the solenoid valve that controls oil flow to cylinder 2 in variable valve timing or cylinder deactivation systems.

2. What are the common symptoms of code P1D66?

Symptoms may include poor engine performance, reduced fuel efficiency, rough idling, misfires, or an illuminated check engine light.

3. What causes the P1D66 code to appear?

Common causes include a faulty oil supply solenoid valve, low or dirty engine oil, clogged oil passages, wiring issues, or a malfunctioning engine control module (ECM).

4. Can dirty engine oil cause the P1D66 code?

Yes, dirty or low engine oil can restrict oil flow to the solenoid, leading to poor performance and triggering the code.

5. How is code P1D66 diagnosed?

Diagnosis involves checking the solenoid valve, inspecting oil levels and quality, testing the wiring and connectors, and using a scan tool to verify the fault.

6. Is it safe to drive with the P1D66 code active?

Driving with this code is not recommended, as it can lead to reduced engine performance and potential damage to internal components.

7. How do you fix the P1D66 code?

Repairs may involve replacing the oil supply solenoid valve, changing the engine oil, cleaning oil passages, or repairing wiring and connectors.

8. Can a bad oil supply solenoid valve cause engine damage?

Yes, if left unaddressed, a faulty solenoid can lead to improper oil flow, which may damage the engine over time.

9. How much does it cost to repair a P1D66 code?

Repair costs vary but typically range from $150 to $400, depending on whether the solenoid, oil, or additional components need replacement.

10. Can a faulty ECM cause the P1D66 code?

While rare, a malfunctioning ECM can misinterpret sensor data and trigger the code. This should only be considered after ruling out mechanical and wiring issues.