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 » P27EC

Code P27EC

Symptoms

• Check Engine Light is on

• Transmission may not shift properly

• Vehicle may not start in certain gear positions

Common Causes

• Faulty transmission range position sensor

• Wiring issues or poor connections

• Faulty PCM

Glossary

PCM: Powertrain Control Module, the computer that manages engine and transmission functions.

OBD-II: On-Board Diagnostics, a standardized system in vehicles for self-diagnostics and reporting.

Related Codes

• P0705

• P0706

Laymans terms

This code means that the car's computer is having trouble understanding what gear the car is in. It's like if you were playing a game and the controller couldn't tell if you pressed the jump button or the run button.

Explanation

The P27EC code indicates an issue with the transmission range position sensor or switch, which is responsible for detecting the gear position of the transmission.

Technical description

The transmission range control position sensor/switch provides input to the vehicle's powertrain control module (PCM) regarding the current gear selection. If the PCM detects a range or performance issue with this sensor, it triggers the P27EC code.

Diagnosis steps

• Use an OBD-II scanner to check for codes.

• Inspect the transmission range position sensor and its wiring.

• Test the sensor for proper operation.

Repair procedures

• Replace the transmission range position sensor.

• Repair or replace damaged wiring or connectors.

• Reprogram or replace the PCM if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Screwdriver set

Estimated repair cost

$150 - $400

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regularly inspect and maintain transmission components.

• Ensure all electrical connections are secure.

• Avoid harsh driving conditions that may stress the transmission.

Error code type

Sensor Issue

User experience recommendations

• Have the vehicle inspected by a professional mechanic.

• Avoid driving the vehicle if it is not shifting properly.

Warranty information

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

Historical data

This code has been reported in vehicles with electronic transmission controls, especially in models with high mileage.

Urgency level

Moderate – It should be addressed soon to prevent further transmission issues.

Legal and safety notice

Driving with a malfunctioning transmission can be unsafe and may lead to further damage.

Testing conditions

• Vehicle in park or neutral.

• Engine running at idle.

Component location

The transmission range position sensor is typically located on the side of the transmission housing.

FAQs

Q: Can I drive with a P27EC code?
A: It's not recommended to drive for long periods with this code as it can lead to transmission issues.

Q: How do I reset the P27EC code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.

Last updated: Jun 9, 2026 • Source: internal database

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