P1011 Code: Intake Camshaft Position Actuator Park Position, Bank 1 (GM Diagnosis & Repair Guide)

P1011 is a GM-specific code tied to the intake camshaft actuator's locking mechanism. It's most common on Gen IV and Gen V small block V8 engines and tends to show up right after cold starts.

What P1011 Means

P1011 is defined as "Intake Camshaft Position Actuator Park Position (Bank 1)." GM's cam phasers include a locking pin that holds the phaser in place until oil pressure builds enough to safely control it. This code sets when the ECM detects that the intake cam phaser wasn't in its locked/park position at startup as expected.

Symptoms of P1011

• Check engine light illuminated
• Hard or rough starts
• Rough running or hesitation right after a cold start
• Reduced fuel economy
• Rattling noise from the timing chain area on startup

Common Causes of P1011

• Intake oil control valve (OCV) solenoid stuck or clogged with sludge
• Thick, degraded, or low engine oil restricting flow to the phaser
• Worn or stuck phaser locking pin
• Clogged oil passages from sludge buildup
• Camshaft phaser wear or failure

GM Vehicles Affected by P1011

P1011 is documented on Chevrolet Silverado, Suburban, Tahoe, Impala, and Malibu; GMC Sierra and Yukon; and Cadillac Escalade and CTS models equipped with Gen IV/V small block V8 engines (5.3L, 6.0L, 6.2L) built from 2007 onward, along with some V6 applications.

How to Diagnose P1011

1. Confirm the code with a scan tool.
2. Check oil level, condition, and change interval — this is the most common root cause.
3. Remove and inspect the intake OCV solenoid (bank 1) for sludge or sticking.
4. Command the solenoid via scan tool and watch the cam position PID for a proper response.
5. Check cam/crank correlation for evidence of a worn phaser.

Step-by-Step Repair for P1011

1. Confirm the code and check oil life/condition; perform an oil and filter change with correct dexos1 5W-30 oil if overdue or dirty.
2. Remove the intake camshaft position actuator solenoid (bank 1) and inspect the screen and wiring.
3. Clean sludge or replace the solenoid if it's sticking or has failed.
4. Recheck the actuator's response with a scan tool bidirectional test.
5. If the phaser itself is worn or failing, replace the camshaft phaser or camshaft assembly.
6. Reassemble, refill oil, and clear codes.
7. Road test through several cold starts to confirm the code doesn't return.

OEM Part Numbers (Representative — Confirm for Your VIN)

• Intake camshaft position solenoid: GM #12655420 — approx. $45-$90
• Camshaft phaser assembly (Gen IV/V V8): approx. $250-$450
• Timing chain kit (if needed): approx. $300-$600

Labor Time

• Solenoid replacement: 0.5 – 1.0 hour
• Phaser/camshaft replacement: 6.0 – 10.0 hours (front cover/timing chain access on V8s)

Estimated Repair Cost for P1011

• Oil service + solenoid: $200 – $400
• Full phaser/camshaft job: $1,200 – $2,200

Frequently Asked Questions

Why does P1011 tend to show up after cold starts specifically?

The phaser's locking pin needs oil pressure to release and control cam timing properly. Right after a cold start, oil hasn't fully circulated yet, which is exactly when a sludged solenoid or worn locking pin is most likely to trip the code.

Can I prevent P1011 with regular maintenance?

Yes — since degraded oil restricting flow to the phaser is the most common cause, staying current on oil changes with the correct dexos1 5W-30 oil is the single most effective way to avoid this code on Gen IV/V small block V8s.

Is P1011 related to AFM/DFM lifter problems?

They're separate systems, but both rely on clean oil flow through small internal passages, and both are more common on higher-mileage Gen IV/V V8s that have gone long stretches without an oil change. Addressing oil quality helps protect against both issues.

How much does it cost if the phaser itself needs replacement?

A full phaser or camshaft job runs $1,200–$2,200 with parts and labor, since it typically requires front cover or timing chain access on V8 engines. That's why it's worth ruling out the cheaper oil and solenoid causes first.

Because this code is so closely tied to oil condition, staying on a proper oil change schedule with the correct dexos1 5W-30 oil is the single best way to prevent it from recurring. For general diagnostic and roadside support, check out the Buture Beta09 Jump Starter/Air Compressor Kit at www.gmserviceguy.shop.

Repair costs and labor times are estimates based on average national rates and can vary by region, shop, vehicle model year, and mileage. Always confirm exact OEM part numbers for your specific VIN before ordering.