P2660 concerns V-type or boxer engines with switchable rocker arms on both cylinder banks: the controller sees the drive circuit of solenoid B on bank 2, the side without cylinder 1, as broken. An open coil, a disconnected plug after valve cover work, or a cut wire leaves the output without load, so the command and the electrical feedback disagree. No manufacturer documents P2660 publicly, and the Honda V6 cases on record involve bank 1 only. GM's 2015 table 15OBDG05 illustrates the method on actuator A with a driver check from 11 V upward and 100 failures in 120 samples. CARB requires circuit monitoring on every lift system output. The bank 1 equivalent is P2650; shorts on this line are P2663 and P2664.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Symptoms
- MIL on
- Bank 2 B stage inactive, uneven running between banks possible
Most likely causes
- Solenoid B plug on bank 2 left unplugged or not latched after repairs
- Open coil in bank 2 solenoid B
- Cut or broken wire on the bank 2 harness branch
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P2660 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 6: Control modules and outputs
- 60: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2660?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P2660?
The most common causes are: solenoid B plug on bank 2 left unplugged or not latched after repairs; open coil in bank 2 solenoid B; cut or broken wire on the bank 2 harness branch.
Related codes
- P2663"B" Rocker Arm Actuator Control Circuit Low (Bank 2)
- P2664"B" Rocker Arm Actuator Control Circuit High (Bank 2)
- P2661"B" Rocker Arm Actuator System Performance/Stuck Off (Bank 2)
- P2650"B" Rocker Arm Actuator Control Circuit/Open (Bank 1)
- P2655"A" Rocker Arm Actuator Control Circuit/Open (Bank 2)
Sources
- law.cornell.edu: 13 CCR 1968.2
- gsi.ext.gm.com: 15OBDG05 Engine Diagnostics
- en.wikipedia.org: Variable valve lift
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.