Range/Performance means the bank 1 feedback sensor for actuator A delivers a signal inside its electrical limits that still does not fit what the engine expects, for example a position that lags or overshoots the commanded one, or that fails to move when the actuator is driven. CARB requires valve lift systems to catch target errors and slow response before emissions exceed set limits. No manufacturer documents P264B publicly; the closest documented case is Toyota's P265B on Valvematic engines (2014 Corolla, 2018–19 C-HR, 2020 Corolla), cured by ECM reprogramming or a new continuously variable lift controller. Worn linkage, a loose sensor, or a dragging actuator are plausible causes.
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 after a drive cycle
- Hesitation or uneven power delivery
- Idle speed fluctuating
Most likely causes
- Actuator or linkage moving sluggishly
- Sensor loose or misaligned on its mount
- Control software needing an update
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P264B means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 6: Control modules and outputs
- 4B: Specific fault in that system
Frequently asked questions
Can I keep driving with code P264B?
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 P264B?
The most common causes are: actuator or linkage moving sluggishly; sensor loose or misaligned on its mount; control software needing an update.
Related codes
- P264A"A" Rocker Arm Actuator Position Sensor Circuit (Bank 1)
- P2646"A" Rocker Arm Actuator System Performance/Stuck Off (Bank 1)
- P266B"A" Rocker Arm Actuator Position Sensor Circuit Range/Performance (Bank 2)
- P265B"B" Rocker Arm Actuator Position Sensor Circuit Range/Performance (Bank 1)
Sources
- law.cornell.edu: 13 CCR 1968.2
- static.nhtsa.gov: MC 10111178 9999
- static.nhtsa.gov: MC 10164873 9999
- 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.