P2645

A Rocker Arm Actuator Control Circuit/Open Bank 1

Q: Is it safe to drive with P2645?

Usually yes, but with reduced performance. The engine loses its variable-lift function and may run rough, so drive gently and get it fixed to avoid drivability and economy losses.

Q: Can I just clear P2645?

It returns once the PCM re-tests the open circuit. Repair the wiring or solenoid first, then clear and re-test.

Variable valve lift / rocker actuator Generic OBD-II Medium

What it means

P2645 means the PCM detected an open (broken) electrical circuit to the 'A' rocker arm actuator on bank 1. This actuator is an oil-controlled solenoid that switches the engine's variable valve lift. With the circuit open the actuator can't operate, so the engine loses that mode and may run rough or down on power. It's an electrical/oil-control fault, not a no-start condition, and is usually caused by wiring or a failed solenoid.

Medium

Can I keep driving? Usually driveable — you may lose the variable-lift mode with reduced power or rough running, but fix it soon to protect drivability and fuel economy.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Reduced power or performance
Rough running or a misfire-like feel
Valvetrain tick or noise
Reduced fuel economy

Common causes

Most likely first

Open circuit — broken wiring or a poor connection to the actuator solenoidLikely
Faulty rocker arm actuator (oil control) solenoid on bank 1Common
Low or dirty engine oil affecting the actuatorCommon
Corroded or loose connector, or a bad groundLess often
Faulty PCMLess often

How to diagnose & fix

Work through it in order

Scan and confirm the code, then inspect the bank 1 actuator wiring and connector for an open.
Check the engine oil level and condition — these actuators are oil-operated.
Measure the solenoid's resistance and its supply/ground circuits.
Replace the actuator solenoid if it fails testing.
Repair wiring as needed, then clear the code and re-test.

FAQ

Quick answers

Is it safe to drive with P2645?+

Usually yes, but with reduced performance. The engine loses its variable-lift function and may run rough, so drive gently and get it fixed to avoid drivability and economy losses.

Can I just clear P2645?+

It returns once the PCM re-tests the open circuit. Repair the wiring or solenoid first, then clear and re-test.

Read & clear P2645 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX