P2659

Code

Generic P — Powertrain

A Rocker Arm Actuator Control Circuit High Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 60 RU: 24

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Page language: EN

Causes

Wiring shorted to battery voltage (short-to-power) on the bank 2 rocker arm actuator control circuit
Open or corroded connector/poor pin contact at the actuator or ECM
Internal failure or short inside the rocker arm actuator/solenoid
PCM/ECM driver output fault
Poor ground or shared-ground problem affecting the circuit
Damage from heat, chafing, or previous repairs

Symptoms

Malfunction Indicator Lamp (MIL) illuminated (check engine light)
P0300-series misfires or rough idle if VVT control is affected
Reduced engine power, hesitation or poor throttle response
Reduced fuel economy and increased emissions
Possible limp-in mode or reduced torque if ECM limits VVT function

What to check

Read and record stored codes and freeze-frame data with a scan tool; note conditions when code set
Verify code is current/repeatable: clear code, perform drive cycle to re-check
Visual inspection of wiring and connectors for bank 2 rocker arm actuators (burns, pin corrosion, crushed/abraded wiring)
Backprobe actuator connector and measure voltage with key on/engine off and while cranking/running using a multimeter or scope
Measure coil/solenoid resistance with connector disconnected (key off) and compare to specifications
Check for continuity between actuator control pin and ECM pin; check for unintended continuity to battery (+) or ground

Signal parameters

Control type: PCM-driven PWM (pulse-width) or switched ground in many systems
Expected inactive voltage: near 0–1 V (or open circuit) when PCM is not commanding; not held at battery voltage
Active signal: pulsed waveform up to battery voltage; duty cycle varies with VVT demand (0–100%)
Typical solenoid coil resistance: commonly 6–30 ohms (varies by manufacturer) — measure unplugged and compare to spec
No steady battery voltage at control pin with actuator connected and PCM not commanding (steady high indicates short-to-power)

Diagnostic algorithm

Connect a scan tool, record codes and freeze-frame; note engine conditions. Clear code and attempt to reproduce.
Visually inspect wiring/connectors on bank 2 rocker arm actuator(s): repair rubbed, melted or corroded sections. Ensure connectors are fully seated and pins straight.
With ignition off, disconnect actuator connector(s). Measure solenoid coil resistance across the actuator terminals; compare to spec. Very low or infinite resistance indicates a failed solenoid.
With harness disconnected, check for unintended continuity between the control wire and battery positive (short-to-power) and to ground. Repair any shorts.
Backprobe the actuator control pin at the harness with the ignition ON (engine OFF) and with engine running; observe voltage with a multimeter and, if available, an oscilloscope to inspect PWM. A steady battery voltage or other abnormal signal indicates wiring short or ECM fault.
If wiring checks OK and actuator resistance is within spec, swap in a known-good actuator (if available) or replace the actuator and retest.
If replaced actuator cures code, reassemble and clear codes; road test. If code returns and wiring to ECM is good, suspect PCM driver fault and consult OEM procedures for PCM testing/replacement.
Safety notes: avoid shorting pins when backprobing; disconnect battery when making wiring repairs.

Likely causes

Short to battery on the actuator control wire between actuator and ECM
Corroded/loose connector at actuator or ECM causing intermittent high voltage readings
Failed rocker arm actuator/solenoid with internal short
PCM driver transistor failure after other repairs or electrical event

Fault status

⚠️ Status

P2659 — Rocker Arm Actuator Control Circuit High (Bank 2). PCM detected higher-than-expected voltage on the bank 2 VVT/rocker arm actuator control circuit. Inspect wiring, connector, actuator and PCM output.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours