Home›Trouble Codes›P2659

P2659 — Rocker Arm Actuator Control Circuit High Bank 2

Manufacturer-specificPowertrain (engine & transmission)

P2659 indicates that the Powertrain Control Module (PCM) has detected a high voltage condition in the rocker‑arm (variable‑valve‑timing) actuator control circuit for Bank 2, meaning the circuit is showing a voltage higher than the expected range. This usually points to a fault in the actuator solenoid, its wiring, or the oil‑pressure supply that feeds it, rather than the PCM itself.

Symptoms

What causes it — most likely first

1. Failed rocker‑arm actuator solenoid (Bank 2)

The solenoid that controls the hydraulic rocker‑arm actuator can short internally, open, or seize, causing a high‑voltage reading on the control circuit.

2. Wiring or connector damage in the actuator circuit

A short to power, broken wire, corrosion, or loose connector can create an unexpectedly high voltage signal to the PCM.

3. Low or insufficient engine oil pressure

The actuator relies on oil pressure to operate; if pressure is too low, the solenoid may not function correctly, leading to circuit anomalies.

4. Faulty oil‑pressure sensor or switch (Bank 2 side)

An incorrect pressure reading can cause the PCM to misinterpret the actuator circuit voltage, although this is less common than a direct solenoid failure.

5. PCM internal circuitry fault (rare)

The PCM could misinterpret the sensor signal due to internal damage, but this accounts for a very small percentage of P2659 cases and should be ruled out only after all other components are verified.

How it's diagnosed

  1. Connect an OBD‑II scanner, record the freeze‑frame, then clear the code and perform a test drive to see if the code returns.
  2. Visually inspect the rocker‑arm actuator and its wiring harness on Bank 2 for damage, corrosion, or loose connectors.
  3. Measure the actuator’s resistance and compare it to the manufacturer’s specification; out‑of‑range values indicate a faulty solenoid.
  4. Check the circuit for shorts to power or ground using a multimeter, and verify that the correct voltage is present at the actuator connector.
  5. Verify engine oil pressure is within spec and that the oil‑pressure sensor readings are consistent with actual pressure.
  6. If all above checks pass, consider PCM reprogramming or replacement as a last resort, after confirming no other fault exists.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2650 — B Rocker Arm Actuator Control CircuitoP2651 — B Rocker Arm Actuator System PerformanP2652 — B Rocker Arm Actuator System Stuck BanP2653 — B Rocker Arm Actuator Control Circuit P2654 — B Rocker Arm Actuator Control Circuit P2655 — Rocker Arm Actuator Control Circuitope

Frequently asked

Is the PCM usually the cause of P2659?

No. While some sources may suggest replacing the PCM, the fault is far more often in the actuator solenoid, its wiring, or related oil‑pressure issues. The PCM should only be considered after those components have been ruled out.

Can I continue driving with a P2659 code?

You may be able to drive short distances, but the underlying problem can lead to reduced performance, poor fuel economy, and potential engine damage if oil pressure is insufficient. It is advisable to diagnose and repair the issue promptly.

What does 'Bank 2' mean?

Bank 2 refers to the engine bank that does not contain cylinder 1. In V‑type engines, it is the opposite side of Bank 1; in some inline‑four or inline‑six engines, it designates the secondary set of cylinders.

Will this code cause the engine light to flash?

The check‑engine light may illuminate steadily, and in some cases it can flash, especially if the fault is causing a noticeable misfire. A flashing light generally indicates a more serious condition that should be addressed quickly.