Failed rocker arm actuator solenoid or its internal coil shorted on; Shorted or chafed wiring in the actuator control circuit touching ground or power; Corroded or loose electrical connector at the actuator or PCM; Stuck rocker arm actuator mechanism due to sludge or mechanical binding; PCM driver failure holding the circuit energized; Oil contamination or low oil pressure preventing the actuator from releasing

DTC codes / P26xx · Computer and output circuits / P2652

P2652'B' Rocker Arm Actuator System Stuck On (Bank 1)

Q: What does code P2652 mean?

'B' Rocker Arm Actuator System Stuck On (Bank 1). P2652 means the powertrain control module (PCM) has detected that the bank 1 'B' rocker arm actuator circuit is stuck in the on state, so the actuator is being commanded off but the circuit remains energized. The PCM monitors the actuator control circuit for expected voltage changes and sets this code when the feedback does not match the commanded state.

P2652 means the powertrain control module (PCM) has detected that the bank 1 'B' rocker arm actuator circuit is stuck in the on state, so the actuator is being commanded off but the circuit remains energized. The PCM monitors the actuator control circuit for expected voltage changes and sets this code when the feedback does not match the commanded state.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or misfire felt as shaking or a stumble at stoplights
Reduced engine power or poor acceleration because the affected cylinders are not breathing correctly
Increased fuel consumption due to inefficient combustion
Audible ticking or tapping from the top of the engine if the actuator is stuck in the high-lift position
In rare cases, the engine may enter limp mode to protect the valvetrain

Common causes, most likely first

Failed rocker arm actuator solenoid or its internal coil shorted on
Shorted or chafed wiring in the actuator control circuit touching ground or power
Corroded or loose electrical connector at the actuator or PCM
Stuck rocker arm actuator mechanism due to sludge or mechanical binding
PCM driver failure holding the circuit energized
Oil contamination or low oil pressure preventing the actuator from releasing

How to diagnose and fix it

Scan all modules for stored and pending codes, then clear codes and test-drive to confirm P2652 returns
Inspect the actuator connector and wiring harness for damage, corrosion, or chafing, and repair as needed
Measure resistance and voltage on the actuator control circuit and compare to manufacturer specifications
Command the actuator on and off with a scan tool while watching circuit feedback to see if it responds
Swap the bank 1 'B' actuator with a known-good unit from another position to see if the code moves
Check engine oil condition and level, and verify oil pressure is within specification
If the circuit and actuator test good, diagnose the PCM driver circuit or replace the PCM after confirming all other causes

What a stuck-on actuator really means

A stuck-on actuator often leaves the valve in high-lift mode, which can cause a misfire that feels like an ignition fault but is actually a valvetrain issue.
Many technicians replace the actuator only to find the real problem is a rubbed-through wire behind the engine that shorts to ground intermittently.
P2652 can be set by a low oil level or degraded oil that prevents the actuator from releasing, so always check oil condition before condemning parts.
The PCM may set this code without any driveability complaint because the actuator can be stuck on at low load and only affect emissions.
Do not overlook the possibility of a faulty PCM driver; it is rare, but it happens and is often misdiagnosed as a bad actuator.

Can I keep driving with P2652?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration or towing because the stuck actuator can cause misfires and overheating of the affected cylinders. If the check engine light is flashing or the engine runs very rough, stop driving and have it towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.