P2655 "A" Rocker Arm Actuator Control Circuit/Open (Bank 2)

P2655 is the bank 2 twin of P2645: on a V or boxer engine with a separate rocker arm actuator per cylinder bank, the drive circuit of actuator A on the side without cylinder 1 is open, so the state the controller sets and the state it sees on the wire differ. No manufacturer documents P2655 publicly. As an analogy, GM's 2015 table 15OBDG05 runs the bank 1 version with 100 failures out of 120 samples at 250 ms intervals and a Type A MIL. A broken wire in the harness running across the engine, a backed-out terminal or an open coil are plausible. Only bank 2 then loses lift switching, which can make the banks run unevenly and cause rough running.

Likely causes

Symptoms

• MIL on
• Banks run unevenly, slight roughness
• Reduced power or economy

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.