AutoCodes – Fiat – P1C99 Fiat

P1C99 Fiat Code - Gear Shift Position Sensor 1 Circuit

Quick Answer

This diagnostic compares the output signal of the sensor to threshold values of normal operations. Common causes include Faulty Gear Shift Position Sensor 1, Gear Shift Position Sensor 1 harness is open or shorted, Gear Shift Position Sensor 1 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: P1C99 Fiat indicates Gear Shift Position Sensor 1 Circuit.
Common causes: Common causes include Faulty Gear Shift Position Sensor 1, Gear Shift Position Sensor 1 harness is open or shorted, Gear Shift Position Sensor 1 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 3,778

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 Apr 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1C99 Fiat Description

This diagnostic compares the output signal of the sensor to threshold values of normal operations. When the signal is out of range the diagnostic will be considered failing. The sensor is mounted next to the 1st - 3rd gear engagement actuator to detect a linear movement of the piston. For this purpose, a permanent magnet is mounted on the piston which is moved over a complete travel stroke. The magnet position generates a saturation area in the internal ferromagnetic core of the sensor which is transformed to an output position signal. The sensor provides an output signal with Pulse Width Modulation (PWM) at a fixed frequency and duty cycle proportional to the piston position of the actuator.

OBDII Code P1C99 Fiat - Gear Shift Position Sensor 1 Circuit - AutoCodes.com — P1C99 Fiat Code - Gear Shift Position Sensor 1 Circuit

What does this mean?

What are the Possible Causes of the DTC P1C99 Fiat?

Faulty Gear Shift Position Sensor 1
Gear Shift Position Sensor 1 harness is open or shorted
Gear Shift Position Sensor 1 circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P1C99 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 P1C99 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 P1C99 Fiat code?

Need more information on how to fix the P1C99 Fiat code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1C99 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 P1C99 Fiat Code

1. What are the common symptoms of OBDII code P1C99 in a Fiat related to the Gear Shift Position Sensor 1 Circuit?

The common symptoms include issues with shifting gears, the gear indicator not matching the actual gear, and possible problems starting the vehicle.

2. What are the possible causes of OBDII code P1C99 in a Fiat related to the Gear Shift Position Sensor 1 Circuit?

Potential causes of this code include a faulty gear shift position sensor, damaged wiring or connectors, or issues with the transmission control module.

3. How can I diagnose the Gear Shift Position Sensor 1 Circuit issue in my Fiat when experiencing OBDII code P1C99?

Diagnosis typically involves a thorough inspection of the gear shift position sensor, checking the wiring and connectors for damage, and using a scan tool to gather more data from the transmission control module.

4. Can I still drive my Fiat with OBDII code P1C99 related to the Gear Shift Position Sensor 1 Circuit?

It is not recommended to drive your Fiat with this code present, as it may lead to shifting issues and potential safety concerns. It's best to address the issue promptly.

5. Is it possible to reset the OBDII code P1C99 in a Fiat related to the Gear Shift Position Sensor 1 Circuit?

Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the code. It's essential to diagnose and repair the problem.

6. How much does it typically cost to repair OBDII code P1C99 in a Fiat related to the Gear Shift Position Sensor 1 Circuit?

The cost of repair can vary depending on the exact cause of the issue. It may involve replacing the gear shift position sensor, repairing wiring, or addressing problems with the transmission control module.

7. Are there any DIY repair tips for OBDII code P1C99 related to the Gear Shift Position Sensor 1 Circuit in a Fiat?

While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, diagnosing and repairing this issue often requires specialized tools and expertise. It's recommended to consult a professional mechanic.

8. How urgent is it to address OBDII code P1C99 in a Fiat related to the Gear Shift Position Sensor 1 Circuit?

It's essential to address this code promptly to prevent further transmission-related issues and ensure the safe operation of your vehicle. Ignoring the problem may lead to more significant repairs down the line.

9. Can extreme weather conditions affect the occurrence of OBDII code P1C99 related to the Gear Shift Position Sensor 1 Circuit in a Fiat?

Extreme temperatures or moisture can potentially impact the functioning of the gear shift position sensor and related components, leading to the triggering of this OBDII code.

10. Will fixing OBDII code P1C99 related to the Gear Shift Position Sensor 1 Circuit in a Fiat improve overall driving performance?

Addressing this code can restore proper gear shifting functionality, improve transmission performance, and enhance the overall driving experience in your Fiat.