P2B35: A Camshaft Profile Actuator B Control Circuit High Bank 1

P2B35 is the short-to-voltage counterpart for intake-side actuator B on bank 1, the second of the sleeve-shifting solenoids on camshaft A. In GM's L3B tables (2019 and again 2025) this test runs while the output is off: if the control line shows 0.5 Ω or less towards the controller supply, a short to power is assumed, and 4 hits in 5 samples set a Type A code with the warning lamp on in the same drive. A wire rubbing against a powered circuit in the harness or an internal short in the solenoid are typical reasons. Because the control line no longer behaves as commanded, the cam sleeve cannot be moved reliably and this actuator drops out of lift switching. Open and ground faults are covered by P2B33 and P2B34.

Medium severity. Can I keep driving?Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.

Bank 1 is the side of the engine with cylinder 1. Inline engines only have this bank.

Symptoms

MIL on during the drive in which the fault appears
Intake lift profile no longer changes as commanded
Higher fuel use because cylinder deactivation is blocked

Most likely causes

Control wire chafed against a powered circuit in the engine harness
Internal short in actuator B
Output stage in the engine control module faulty

What to check, in order

Start with the simplest. You can tick off each step.

Check the oil level and condition before anything else
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Check the solenoid valve's connector
Compare commanded and actual angles in live data
Test the solenoid valve and its filter, if it has one
Check the engine timing if there is chain noise

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2B35 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
B: Subsystem depends on the code range
35: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2B35?

Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.

What causes code P2B35?

The most common causes are: control wire chafed against a powered circuit in the engine harness; internal short in actuator B; output stage in the engine control module faulty.

Related codes

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.