AutoCodes – Fiat – P104C Fiat

P104C Fiat Code - Cylinder 4 Oil Supply Solenoid Valve Overcurrent

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: P104C Fiat indicates Cylinder 4 Oil Supply Solenoid Valve Overcurrent.
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 1,473

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 P104C 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 Variable Valve Actuator (VVA) solenoid current feedback level in voltage is out of range.

OBDII Code P104C Fiat - Cylinder 4 Oil Supply Solenoid Valve Overcurrent - AutoCodes.com — P104C Fiat Code - Cylinder 4 Oil Supply Solenoid Valve Overcurrent

What does this mean?

What are the Possible Causes of the DTC P104C 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 P104C 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 P104C 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 P104C Fiat code?

Need more information on how to fix the P104C Fiat code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P104C 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 P104C Fiat Code

1. What are the common symptoms of OBDII code P104C in a Fiat related to the Cylinder 4 Oil Supply Solenoid Valve Overcurrent issue?

The common symptoms include engine misfires, rough idling, decreased fuel efficiency, and potentially an illuminated check engine light.

2. What are the possible causes of OBDII code P104C in a Fiat?

Possible causes may include a faulty oil supply solenoid valve, wiring issues in the solenoid circuit, engine oil pressure problems, or a defective Engine Control Module (ECM).

3. How can I diagnose the Cylinder 4 Oil Supply Solenoid Valve Overcurrent issue in my Fiat?

Diagnosis typically involves using an OBDII scanner to retrieve the P104C code, conducting a visual inspection of the solenoid valve and its wiring, and testing the circuit for proper voltage and continuity.

4. Can I drive my Fiat with OBDII code P104C present?

It is not recommended to drive the vehicle with this code present, as it can lead to further engine damage and potential safety hazards. It's best to address the issue promptly.

5. Is it safe to continue driving my Fiat if the check engine light is flashing along with code P104C?

A flashing check engine light indicates a severe misfire that can cause damage to the catalytic converter. It is not safe to continue driving in this condition and the vehicle should be inspected immediately.

6. How can I repair the Cylinder 4 Oil Supply Solenoid Valve Overcurrent issue in my Fiat?

Repairing the issue may involve replacing the faulty solenoid valve, repairing any damaged wiring, addressing engine oil pressure problems, or reprogramming the ECM if necessary.

7. Are there any maintenance tips to prevent OBDII code P104C from occurring in my Fiat?

Regularly servicing the engine oil system, checking for oil leaks, and ensuring proper maintenance of the oil supply components can help prevent issues leading to code P104C.

8. Can a DIY enthusiast fix the Cylinder 4 Oil Supply Solenoid Valve Overcurrent problem in a Fiat?

While some may have the skills to diagnose and replace the solenoid valve, this repair may require advanced knowledge and tools. It's recommended to consult a professional mechanic for proper diagnosis and repair.

9. Will resetting the check engine light make OBDII code P104C go away in my Fiat?

Resetting the check engine light will clear the code temporarily, but if the underlying issue causing code P104C is not addressed, the light will likely come back on after some driving cycles.

10. How much can I expect to pay to repair OBDII code P104C in a Fiat at a repair shop?

The cost of repair can vary depending on the exact cause of the issue and labor rates in your area. It's best to get a diagnostic from a trusted mechanic to determine the specific repair cost.