P2645: The engine computer sees an open circuit in the rocker arm actuator A (bank 1)

Rocker arm actuator A, bank 1, open circuit

Severity: Severity not verified — if the car runs badly, have it inspected

No source read for this code states how urgent it is, so the severity has not been verified.

P2645 in short

P2645 means the engine computer sees an open circuit in the circuit for the bank 1 rocker arm actuator A, the solenoid that switches the valve rocker arm. The likely causes are wiring or the actuator solenoid. How urgent it is has not been verified, so have a shop read the code.

Some engines use switching rocker arms to change valve lift or turn cylinders off. An electrical actuator, often a solenoid, tells each rocker arm what to do, and the computer checks the circuit for a break.

P2645 sets when the computer sees an open circuit for rocker arm actuator A on bank 1. TroubleCodes.net gives wiring or the actuator as the likely causes. A Chevrolet Impala owner was told by the dealer that it was the intake rocker arm control circuit solenoid.

A Toyota Corolla owner was told the computer needed an update, with P2645 and/or P265B documented. That is one owner's account and is not enough to say how common that is.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

Cause 1: Rocker arm actuator solenoid
Common general cause
Why it ranks here
TroubleCodes.net lists the actuator as a likely cause, and the Impala dealer named the intake rocker arm control solenoid.
What would change this
Rises if the solenoid's resistance reads open or out of specification. Falls if the solenoid tests good.
Cause 2: Open or damaged wiring or connector to the actuator
Common general cause
Why it ranks here
An open circuit is by definition a break somewhere, and TroubleCodes.net lists wiring first.
What would change this
Rises if a continuity check finds a break or a damaged connector. Falls if the wiring tests good.
Cause 3: Engine computer software (Toyota, one report)
Possible — needs testing
Why it ranks here
One Corolla owner was told an update or reboot was needed. This is a single report and the owner's account only.
What would change this
Rises if a dealer confirms an open update for your VIN. Falls if the software is current.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

Step 1: Read all stored codes and freeze-frame data, and note whether P265B or other valve control codes are stored with P2645.
Low riskTool: OBD-II scan tool
- IfOther valve control or rocker arm codes are stored
  It meansThe fault may be in a shared part of the circuit.
  Go to step 2
- IfP2645 is the only code
  It meansCheck the wiring and actuator.
  Go to step 2
Step 2: Have a shop check the actuator connector and wiring for damage or an open circuit, and test the actuator solenoid with a multimeter against the specification.
Best left to a shopTool: multimeter, wiring diagram
Warning:On many engines the actuator sits under the valve cover and needs engine oil and cover work; unplugging connectors with the ignition on can damage the computer.
- IfThe wiring has a break or damaged connector
  It meansRepair the wiring.
  Points to: Open or damaged wiring or connector to the actuator
- IfThe wiring is good but the solenoid reads open
  It meansReplace the actuator.
  Points to: Rocker arm actuator solenoid
- IfBoth test good
  It meansAsk a dealer about computer software.
  Points to: Engine computer software (Toyota, one report)

Symptoms

Check engine light

How to fix

Parts and cost context

Variable valve timing (VVT) oil control solenoid:The rocker arm actuator is a solenoid like a VVT solenoid, but a different part. Part cost and labour vary widely by engine; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Chevrolet

2014 · Impala
Possible — needs testing
One 2014 owner was told by a dealer that P2645 was the intake rocker arm control circuit solenoid.

Toyota

2014 · Corolla
Possible — needs testing
One 2014 owner reports a Toyota representative blaming computer software with P2645 and/or P265B.

No curated relationships for P2645 yet.

All Variable valve timing (VVT) codes

Sources and review

P2645 trouble code page — TroubleCodes.net
NHTSA complaint ODI 11327388 — NHTSA Office of Defects Investigation
NHTSA complaint ODI 10658735 — NHTSA Office of Defects Investigation

Last reviewed: October 16, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

Severity: Severity not verified — if the car runs badly, have it inspected

Most likely causes

Cause 1: Rocker arm actuator solenoid

Cause 2: Open or damaged wiring or connector to the actuator

Cause 3: Engine computer software (Toyota, one report)

What to test first

Step 1: Read all stored codes and freeze-frame data, and note whether P265B or other valve control codes are stored with P2645.

Step 2: Have a shop check the actuator connector and wiring for damage or an open circuit, and test the actuator solenoid with a multimeter against the specification.