Powertrain, generic (extended)

P2654 "B" Rocker Arm Actuator Control Circuit High (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2654 reports a voltage that is too high on the wire that drives rocker solenoid B, bank 1, typically when the line touches a battery-fed wire or the driver's ground side is bridged. With a ground-switched solenoid, that kind of short can energise the valve permanently, so the B stage may stay engaged regardless of the command, which the engine feels as rough idle or misfire at low speed. No carmaker publishes this code with details. GM checks the matching A circuit (P2649) on its 2015 four-cylinders using an output test that needs at least 11 V and declares a Type A fault once 100 of 120 checks fail. CARB counts a short to power among the circuit faults a lift system must catch. Related: P2653 for the low side, P2650 for an open circuit, P2664 on bank 2.

Likely causes

Solenoid B control wire shorted to a battery-fed circuit
Internal short in solenoid B lowering its resistance
Shorted output transistor in the engine control module

Symptoms

  • MIL on
  • Rough idle or misfire if the B stage stays engaged
  • Possible blown fuse on the solenoid supply

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–600
Time0.5–2.5 h

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

Parts involved

rocker arm actuator b b1oil control valvewiring harness

Related codes

P2650P2653P2649P2664

References: law.cornell.edu, gsi.ext.gm.com.