AutoCodes – Fiat – P104B Fiat

P104B Fiat Code - Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range

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: P104B Fiat indicates Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range.
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 831

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 P104B 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 Variable Valve Actuator (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 calculates that the delay in the measurement of current samples is greater that the required sampling period.

OBDII Code P104B Fiat - Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range - AutoCodes.com — P104B Fiat Code - Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range

What does this mean?

What are the Possible Causes of the DTC P104B 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 P104B 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 P104B 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 P104B Fiat code?

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Need Help with the Code?

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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 P104B Fiat Code

1. What are the common symptoms of OBDII code P104B in a Fiat related to the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range?

- Common symptoms include rough idle, engine misfires, decreased performance, and possible stalling.

2. What are the possible causes of the P104B error code in a Fiat indicating an issue with the Cylinder 4 Oil Supply Solenoid Valve Voltage?

- Causes may include a faulty oil supply solenoid valve, electrical connection issues, wiring problems, or a malfunctioning PCM.

3. How can I diagnose the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range issue in my Fiat when experiencing the P104B trouble code?

- Diagnose the problem by inspecting the solenoid valve, checking the electrical connections, testing the wiring for continuity, and scanning for other related codes.

4. Is it safe to continue driving my Fiat with the OBDII code P104B pertaining to the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range?

- It is not recommended to drive the vehicle with this issue as it can lead to further engine damage or potential safety hazards.

5. Can I reset the OBDII code P104B related to the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range in my Fiat without fixing the underlying problem?

- While you can clear the code temporarily, it will likely reappear until the root cause is diagnosed and repaired.

6. Are there any DIY repair tips for addressing the P104B error code in a Fiat linked to the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range?

- DIY tips include checking and cleaning electrical connections, inspecting for visible damage, and ensuring proper installation of the solenoid valve.

7. How much does it typically cost to fix the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range issue triggering the P104B code in a Fiat?

- The cost of repair can vary depending on the specific problem, but it may involve replacing the solenoid valve, repairing wiring, or reprogramming the PCM.

8. Will the P104B trouble code in a Fiat related to the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range cause permanent damage if not addressed promptly?

- Ignoring the issue can potentially lead to engine damage or poor performance, so it is advisable to address the problem promptly.

9. Can a professional mechanic easily diagnose and repair the OBDII code P104B associated with the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range in a Fiat?

- Yes, a qualified mechanic with the right diagnostic tools and expertise can efficiently diagnose and repair the underlying cause of the P104B trouble code.

10. Are there any recalls or service bulletins related to the OBDII code P104B concerning the Cylinder 4 Oil Supply Solenoid Valve Voltage Out Of Range in Fiat vehicles?

- It is recommended to check with Fiat dealerships or online resources for any relevant recalls or service bulletins regarding this specific issue.