AutoCodes – Generic – P1900

P1900 Code - Output Shaft Speed Circuit Intermittent Malfunction

Quick Answer

The Output Shaft Speed (OSS) sensor provides the Powertrain Control Module (PCM) with information about the rotational speed of an output shaft. Common causes include Output Shaft Speed (OSS) not installed properly, Faulty Output Shaft Speed sensor, Output Shaft Speed sensor harness is open or shorted. 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: P1900 indicates Output Shaft Speed Circuit Intermittent Malfunction.
Common causes: Common causes include Output Shaft Speed (OSS) not installed properly, Faulty Output Shaft Speed sensor, Output Shaft Speed sensor harness is open or shorted.
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 30,789

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 Jul 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1900 Description

The Output Shaft Speed (OSS) sensor provides the Powertrain Control Module (PCM) with information about the rotational speed of an output shaft. The PCM uses the information to control and diagnose powertrain behavior. In some applications, the sensor is also used as the source of vehicle speed. The sensor may be physically located in different places on the vehicle, depending upon the specific application. The design of each speed sensor is unique and depends on which powertrain control feature uses the information that is generated. The Diagnostic Trouble Code (DTC) will set when the OSS sensor signal to the PCM is irregular or interrupted.

OBDII Code P1900 - Output Shaft Speed Circuit Intermittent Malfunction - AutoCodes.com — P1900 Code - Output Shaft Speed Circuit Intermittent Malfunction

What does this mean?

What are the Possible Causes of the DTC P1900?

Output Shaft Speed (OSS) not installed properly
Faulty Output Shaft Speed sensor
Output Shaft Speed sensor harness is open or shorted
Output Shaft Speed sensor circuit poor electrical connection

How to Fix the DTC P1900?

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 P1900 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 P1900 code?

Need more information on how to fix the P1900 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1900 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1900 Audi — Engine Coolant Blower Motor Speed 2 Open Circuit/Short To Ground
P1900 Ford — Output Shaft Speed Circuit Intermittent Malfunction
P1900 Infiniti — Radiator Cooling Fan Motor Control
P1900 Lincoln — Output Shaft Speed Circuit Intermittent Malfunction
P1900 Mazda — Turbine Shaft Speed Sensor Intermittent
P1900 Mercury — Output Shaft Speed Circuit Intermittent Malfunction
P1900 Nissan — Radiator Cooling Fan Motor Control

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 P1900 Code

1. What are the common symptoms of OBDII code P1900?

- Common symptoms include erratic shifting, harsh shifting, transmission slipping, and the vehicle going into limp mode.

2. What are some possible causes of the Output Shaft Speed Circuit Intermittent Malfunction (P1900) code?

- Possible causes include a faulty output shaft speed sensor, damaged wiring or connectors in the circuit, a malfunctioning transmission control module (TCM), or internal transmission issues.

3. How can I diagnose the cause of the P1900 code?

- To diagnose the issue, you can use a scan tool to read the code and check for any related codes. Then, inspect the output shaft speed sensor and its wiring for damage, test the sensor's resistance, and check the TCM for proper operation.

4. Can I continue driving my vehicle with the P1900 code present?

- It is not recommended to drive the vehicle with the P1900 code present, as it can lead to further damage to the transmission and other components. It is best to address the issue promptly.

5. How can I repair the Output Shaft Speed Circuit Intermittent Malfunction (P1900) code?

- Repair methods may include replacing the output shaft speed sensor, repairing damaged wiring or connectors, resetting the TCM, or addressing any internal transmission problems. Consult a professional mechanic for accurate diagnosis and repair.

6. Will resetting the trouble codes make the P1900 code disappear permanently?

- Resetting the trouble codes may temporarily clear the P1900 code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is essential to diagnose and repair the root cause of the problem.

7. Can a DIY enthusiast fix the Output Shaft Speed Circuit Intermittent Malfunction (P1900) code?

- While some aspects of diagnosing and repairing the P1900 code may be within reach of a knowledgeable DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and repair, especially when dealing with transmission-related issues.

8. How much does it typically cost to repair the P1900 code?

- The cost of repairing the P1900 code can vary depending on the underlying cause of the issue, the labor rates in your area, and the cost of parts needed for the repair. It is advisable to obtain multiple quotes from reputable mechanics for an accurate estimate.

9. Are there any preventative measures to avoid the P1900 code from recurring?

- Regular maintenance of your vehicle, including checking and replacing transmission fluid at the recommended intervals, can help prevent issues that may trigger the P1900 code. Additionally, addressing any warning signs promptly can prevent further damage.

10. Is the P1900 code specific to certain vehicle makes and models?

- The P1900 code, indicating an Output Shaft Speed Circuit Intermittent Malfunction, can be found in various vehicle makes and models, particularly those equipped with OBDII systems and automatic transmissions. It is essential to consult your vehicle's specific diagnostic manual for accurate information.