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DTC codes / P26xx · Computer and output circuits / P2659

P2659'A' Rocker Arm Actuator Control Circuit High (Bank 2)

P2659 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the 'A' rocker arm actuator on bank 2 of the engine. This actuator is part of a variable valve timing or cylinder deactivation system that adjusts valve lift or rocker arm operation to optimize performance and efficiency. The high voltage suggests a short to power, an open circuit, or a faulty actuator, and the PCM may disable the system and illuminate the check engine light.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaComputer and output circuits

Symptoms you may notice

  • Illumination of the check engine light (malfunction indicator lamp).
  • Often no symptoms besides the warning light, especially if the fault is intermittent.
  • Reduced engine performance or power, particularly at higher RPMs.
  • Rough idle or misfire if the actuator fails to adjust valve timing properly.
  • Decreased fuel economy due to improper valve operation.
  • In some cases, the engine may enter limp mode to protect the valvetrain.

Common causes, most likely first

  1. Faulty rocker arm actuator solenoid or actuator assembly on bank 2.
  2. Damaged or corroded wiring harness or connector at the actuator.
  3. Short to power in the control circuit between the PCM and actuator.
  4. Open circuit in the control circuit, such as a broken wire or poor connection.
  5. Failed PCM driver for the actuator control circuit (rare).
  6. Oil sludge or debris obstructing the actuator, causing electrical feedback.
  7. Aftermarket electrical accessories improperly wired into the circuit.

How to diagnose and fix it

  1. Use an OBD-II scanner to verify P2659 and check for related codes; record freeze-frame data.
  2. Inspect the actuator connector and wiring for damage, corrosion, or loose pins; repair as needed.
  3. Measure resistance of the rocker arm actuator solenoid and compare to manufacturer specifications.
  4. Check for short to power or open circuit in the control wire using a multimeter and wiring diagram.
  5. Test the PCM output signal to the actuator with an oscilloscope or bidirectional scan tool if available.
  6. If electrical tests pass, remove and inspect the actuator for mechanical binding or sludge; clean or replace.
  7. Clear codes and perform a road test to confirm the repair; verify no pending codes return.

Rocker Arm Actuator Circuit Pitfalls

  • A high voltage code often results from an open circuit rather than a short, so a broken wire or disconnected connector is a common culprit that is frequently overlooked.
  • Oil contamination in the actuator connector can create high resistance and set this code without any mechanical failure of the actuator itself.
  • Some vehicles use the same actuator for both valve timing and cylinder deactivation, so a fault may cause drivability issues that seem unrelated to the valvetrain.
  • The PCM may set P2659 intermittently if the actuator coil is failing only when hot, so testing should include a heat soak or wiggle test of the harness.
  • Replacing the actuator without checking the circuit can lead to a repeat failure if the root cause is a chafed wire or faulty PCM driver.

Can I keep driving with P2659?

You can usually drive the vehicle with P2659 set, but avoid aggressive acceleration or heavy loads because the disabled actuator may cause reduced performance or increased emissions. If the engine runs rough or enters limp mode, seek service promptly to prevent potential valvetrain damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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