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.
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 1 is the side of the engine with cylinder 1. Inline engines only have this bank.
Symptoms
- MIL on
- Rough idle or misfire if the B stage stays engaged
- Possible blown fuse on the solenoid supply
Most 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
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 P2654 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 6: Control modules and outputs
- 54: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2654?
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 P2654?
The most common causes are: 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.
Related codes
- P2650"B" Rocker Arm Actuator Control Circuit/Open (Bank 1)
- P2653"B" Rocker Arm Actuator Control Circuit Low (Bank 1)
- P2649"A" Rocker Arm Actuator Control Circuit High (Bank 1)
- P2664"B" Rocker Arm Actuator Control Circuit High (Bank 2)
Sources
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.