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 » P1265

Code P1265

Symptoms

• Check Engine Light is on

• Poor engine performance

• Increased emissions

Common Causes

• Faulty EGR positioner

• Wiring issues such as short circuits or open circuits

• Faulty ECM

Glossary

EGR: Exhaust Gas Recirculation

ECM: Engine Control Module

Related Codes

• P0400

• P0401

Laymans terms

This code means that there is a problem with the part of the car that helps control pollution. It's like a switch that tells the car how much air to let out, and it's not working right.

Explanation

The EGR (Exhaust Gas Recirculation) positioner circuit is sending a high voltage signal, indicating a potential issue with the circuit or the EGR positioner itself.

Technical description

The P1265 code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the EGR positioner circuit on bank 2. This could be due to an electrical fault, such as a short circuit, or a malfunctioning EGR positioner.

Diagnosis steps

• Use an OBD-II scanner to confirm the code.

• Inspect the EGR positioner and its wiring for damage.

• Test the voltage and ground signals at the EGR positioner.

Repair procedures

• Repair or replace damaged wiring or connectors.

• Replace the EGR positioner if faulty.

• Reprogram or replace the ECM if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Wrench set

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regular maintenance checks

• Ensure proper EGR system cleaning

• Check wiring and connectors periodically

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the Check Engine Light.

• Have a professional diagnose the issue if unsure.

• Regularly maintain your vehicle to prevent such issues.

Warranty information

Check with your vehicle manufacturer for warranty coverage on emission-related components.

Historical data

The P1265 code has been commonly associated with EGR system faults in vehicles with high mileage.

Urgency level

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

Legal and safety notice

Ignoring emission-related issues can lead to failing emissions tests and increased pollution.

Testing conditions

• Engine must be running

• Vehicle must be at operating temperature

Component location

The EGR positioner is typically located near the engine's intake manifold on bank 2.

FAQs

Q: What is an EGR positioner?
A: An EGR positioner helps control the amount of exhaust gases recirculated back into the engine to reduce emissions.

Q: Can I drive with a P1265 code?
A: It's not recommended to drive for long periods with this code as it can lead to increased emissions and engine performance issues.

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

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