P1523 on Chevrolet
Variable Cam Timing (VCT/IVC) Solenoid Stuck / Circuit Malfunction
P1523 on Chevrolet vehicles indicates variable cam timing (vct/ivc) solenoid stuck / circuit malfunction. Au7o has documented this code across 1 Chevrolet model — most commonly on TrailBlazer. This is a manufacturer-specific code (commonly Ford) generally pointing to a problem in the variable cam timing system, often described as an intake valve control (IVC) solenoid that is stuck or whose circuit has malfunctioned. The VCT actuator uses oil pressure to advance or retard camshaft timing, and a stuck or electrically faulty solenoid prevents it from responding to commands. Symptoms can include rough idle, reduced power, and a check engine light. Contaminated oil or a sticking solenoid is a frequent cause; confirm the precise definition for the specific vehicle. Typical repair costs on Chevrolet range from $150 to $700, depending on the specific model and root cause.
Common Causes of P1523
- •Sticking or stuck VCT/IVC solenoid (often from sludge)
- •Dirty, degraded, or wrong-viscosity engine oil
- •Low oil pressure or low oil level
- •Faulty VCT solenoid (electrical failure)
- •Wiring or connector fault at the solenoid
- •Worn VCT actuator/phaser
P1523 on Chevrolet by Model
Chevrolet TrailBlazer(1 issue)
- Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P21352002-2009
The GMT360 TrailBlazer uses a drive-by-wire throttle actuator control system with dual redundant sensors in both the throttle body and the accelerator pedal. When the two throttle position signals disagree the PCM sets P2135 and drops the truck into Reduced Engine Power limp mode — the vehicle will barely accelerate, which is dangerous when it happens pulling into traffic. Usual root causes are an internally failed electronic throttle body, a corroded or loose crimp in the throttle body connector, or moisture intrusion in the harness. Related codes P0641 (5V reference) and P1523 (throttle closed position performance) show up alongside it.
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View P1523 across all makes →Frequently Asked Questions
What does P1523 mean on Chevrolet?▼
P1523 stands for "Variable Cam Timing (VCT/IVC) Solenoid Stuck / Circuit Malfunction." This is a manufacturer-specific code (commonly Ford) generally pointing to a problem in the variable cam timing system, often described as an intake valve control (IVC) solenoid that is stuck or whose circuit has malfunctioned. The VCT actuator uses oil pressure to advance or retard camshaft timing, and a stuck or electrically faulty solenoid prevents it from responding to commands. Symptoms can include rough idle, reduced power, and a check engine light. Contaminated oil or a sticking solenoid is a frequent cause; confirm the precise definition for the specific vehicle. On Chevrolet specifically, this code is documented across 1 model.
What causes P1523 on Chevrolet vehicles?▼
Common causes on Chevrolet: Sticking or stuck VCT/IVC solenoid (often from sludge), Dirty, degraded, or wrong-viscosity engine oil, Low oil pressure or low oil level, Faulty VCT solenoid (electrical failure), Wiring or connector fault at the solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1523 on a Chevrolet?▼
Repair costs on Chevrolet range from $150 to $700, depending on the specific model and root cause.
Which Chevrolet models have P1523 documented?▼
Au7o has documented P1523 on 1 Chevrolet model: TrailBlazer.