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 » P2663

Code P2663

Symptoms

• Check Engine Light is on

• Reduced engine performance

• Poor fuel economy

Common Causes

• Faulty rocker arm actuator

• Wiring issues or poor connections in the circuit

• Faulty ECM

Glossary

ECM: Engine Control Module

VVT: Variable Valve Timing

Related Codes

• P2646

• P2650

Laymans terms

This code means that there's a problem with a part of the engine that helps control how the car runs. It's like a switch that isn't working right on one side of the engine.

Explanation

The P2663 code indicates that the engine control module (ECM) has detected a low voltage condition in the rocker arm actuator control circuit on bank 2.

Technical description

The rocker arm actuator is part of the variable valve timing (VVT) system, which helps optimize engine performance and efficiency. Bank 2 refers to the side of the engine opposite to bank 1 in a V-type engine. A low circuit condition suggests insufficient voltage or a poor connection in the actuator's control circuit.

Diagnosis steps

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

• Inspect the wiring and connectors for damage or corrosion.

• Test the rocker arm actuator for proper operation.

Repair procedures

• Repair or replace damaged wiring or connectors.

• Replace the faulty rocker arm actuator.

• Reprogram or replace the ECM if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Honda Accord

• Acura TL

• Chevrolet Silverado

Preventive measures

• Regular maintenance and inspections

• Ensure proper oil levels and quality

• Address wiring issues promptly

Error code type

Engine Performance

User experience recommendations

• Do not ignore the Check Engine Light.

• Have the vehicle inspected by a professional if unsure.

Warranty information

Check with the manufacturer for specific warranty coverage related to engine components.

Historical data

This code has been associated with issues in vehicles with advanced VVT systems, particularly in models from the early 2000s.

Urgency level

Moderate – It should be addressed soon to avoid potential engine performance issues.

Legal and safety notice

Driving with a malfunctioning engine component can lead to increased emissions and potential safety risks.

Testing conditions

• Engine at operating temperature

• Vehicle in park or neutral

Component location

The rocker arm actuator is located on the cylinder head of bank 2, typically near the camshaft.

FAQs

Q: What happens if I ignore this code?
A: Ignoring this code can lead to reduced engine performance and potential damage over time.

Q: Can I drive my car with a P2663 code?
A: While you may be able to drive for a short period, it's best to address the issue soon to avoid further damage.

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

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