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DTC codes / P26xx · Computer and output circuits / P2660

P2660'B' Rocker Arm Actuator Control Circuit/Open (Bank 2)

P2660 is a generic OBD-II code that indicates the powertrain control module (PCM) has detected an open circuit in the control circuit for the 'B' rocker arm actuator on bank 2 of the engine. The PCM commands the actuator to change valve lift for improved efficiency, but the circuit's electrical path is broken, so the actuator cannot function as intended.

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

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • Reduced engine performance or power, especially at higher speeds or under load.
  • Rough idle or misfire-like sensations due to improper valve lift on bank 2.
  • Decreased fuel economy as the engine cannot optimize valve timing.
  • In some cases, the engine may enter limp mode to protect the valvetrain.

Common causes, most likely first

  1. Broken or chafed wire in the actuator control circuit, often near connectors or where the harness bends.
  2. Corroded or loose electrical connector at the rocker arm actuator or PCM.
  3. Failed rocker arm actuator solenoid (open coil).
  4. Faulty PCM driver for the actuator circuit (rare but possible).
  5. Damage to the actuator from oil sludge or debris, leading to an open circuit.
  6. Aftermarket or improper electrical modifications interfering with the circuit.

How to diagnose and fix it

  1. Use a scan tool to verify P2660 is active and check for related codes; clear the code and test-drive to see if it returns.
  2. Visually inspect the actuator harness and connector on bank 2 for damage, corrosion, or loose pins; repair as needed.
  3. Measure resistance of the rocker arm actuator solenoid with a multimeter and compare to manufacturer specifications; replace if out of range.
  4. Check for continuity and voltage drop in the control circuit between the PCM and actuator; repair open or high-resistance wiring.
  5. If the circuit and actuator test good, suspect the PCM; perform a wiggle test and check for intermittent faults before replacement.
  6. Replace the faulty rocker arm actuator if tests indicate an open coil or mechanical failure.
  7. After repair, clear codes and perform a relearn or drive cycle as required by the manufacturer to confirm the fix.

What most technicians overlook with P2660

  • A common oversight is assuming the actuator itself is at fault when the real problem is a chafed wire in the harness near the bank 2 valve cover, often caused by engine vibration or heat.
  • The code can be set intermittently by a poor connection at the actuator connector, so a wiggle test while monitoring live data is more reliable than a static resistance check.
  • Some vehicles use the same part number for bank 1 and bank 2 actuators, but swapping them to test can introduce new codes if the connectors are not identical; always verify part compatibility.
  • An open circuit can be caused by oil contamination in the connector, which may not be obvious until the connector is disassembled and cleaned.
  • P2660 does not always mean the actuator is dead; the PCM may set it if the circuit's resistance is slightly out of range due to corrosion, even if the actuator still functions.

Can I keep driving with P2660?

You can usually drive the vehicle with P2660, but avoid heavy acceleration and high speeds because the engine may lack power and fuel economy will suffer. Prolonged driving with the fault may cause increased emissions or stress on other valvetrain components, so schedule a diagnosis soon.

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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