What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

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Home » OBD2 Codes » P1850

Code P1850

Symptoms

• Check engine light is on

• Difficulty in shifting gears

• Transmission may enter limp mode

Common Causes

• Faulty gate select sensor

• Wiring issues in the sensor circuit

• Faulty PCM or transmission control module

Glossary

PCM: Powertrain Control Module

Limp Mode: A safety feature that limits vehicle performance to prevent damage

Related Codes

• P1851

• P1852

Official description

Gate Select Sensor Circuit High

Laymans terms

The car's computer is saying that a sensor that helps the car know which gear you're trying to select is not working properly.

Explanation

This code indicates that the voltage in the gate select sensor circuit is higher than expected.

Technical description

The P1850 code is triggered when the powertrain control module (PCM) detects a high voltage condition in the gate select sensor circuit. This sensor is responsible for providing feedback to the transmission control module about the position of the gear selector.

Diagnosis steps

• Inspect the wiring and connectors in the gate select sensor circuit.

• Test the gate select sensor for proper operation.

• Check the PCM and transmission control module for faults.

Repair procedures

• Repair or replace damaged wiring or connectors.

• Replace the faulty gate select sensor.

• Reprogram or replace the PCM if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Ford Focus

• Mazda 3

• Volkswagen Jetta

Preventive measures

• Regular maintenance checks on transmission components

• Ensure proper wiring connections

• Avoid harsh driving conditions

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the check engine light.

• Have the vehicle inspected by a professional mechanic.

Warranty information

Check with your vehicle manufacturer for specific warranty coverage on transmission components.

Historical data

This code has been associated with transmission issues in vehicles with electronic gear selectors.

Urgency level

Moderate – Should be addressed soon to avoid potential transmission damage.

Legal and safety notice

Driving with a malfunctioning transmission sensor can lead to unsafe driving conditions.

Testing conditions

• Vehicle in park or neutral

• Engine running

Component location

The gate select sensor is usually located on or near the transmission housing.

FAQs

Q: Can I drive with a P1850 code?
A: It's not recommended as it can lead to transmission issues and unsafe driving conditions.

Q: How is the gate select sensor tested?
A: A multimeter can be used to check the voltage and resistance of the sensor circuit.

Last updated: Oct 7, 2025 • Source: internal database

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