AutoCodes – Buick – P16D1 Buick

P16D1 Buick Code - Intake Rocker Arm Solenoid Valve 2 Stuck On

Quick Answer

The rocker arm actuator system enables the Engine Control Module (ECM) to change the camshaft lift and duration while the engine is operating. Common causes include Faulty Intake Rocker Arm Solenoid Valve 2, Intake Rocker Arm Solenoid Valve 2 harness is open or shorted, Intake Rocker Arm Solenoid Valve 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P16D1 Buick indicates Intake Rocker Arm Solenoid Valve 2 Stuck On.
Common causes: Common causes include Faulty Intake Rocker Arm Solenoid Valve 2, Intake Rocker Arm Solenoid Valve 2 harness is open or shorted, Intake Rocker Arm Solenoid Valve 2 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 929

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P16D1 Buick Description

The rocker arm actuator system enables the Engine Control Module (ECM) to change the camshaft lift and duration while the engine is operating. The camshaft has 3 lobes for each intake valve. The inner lobe is for low lift and the 2 outer lobes are for high lift. The rocker arm solenoid valve controls the 2-step lift by controlling the oil flow to the rocker arm. In default mode, a locking pin locks the inner and outer mechanisms of the rocker arm together to provide high lift. When low lift is commanded, oil pressure retracts a locking pin within the rocker arm.
The rocker arm solenoid valve receives a signal from the ECM. The ECM controls the rocker arm solenoid valve by supplying a 12 V PWM signal. The ECM supplies a ground to the low reference circuit.

OBDII Code P16D1 Buick - Intake Rocker Arm Solenoid Valve 2 Stuck On - AutoCodes.com — P16D1 Buick Code - Intake Rocker Arm Solenoid Valve 2 Stuck On

What does this mean?

What are the Possible Causes of the DTC P16D1 Buick?

Faulty Intake Rocker Arm Solenoid Valve 2
Intake Rocker Arm Solenoid Valve 2 harness is open or shorted
Intake Rocker Arm Solenoid Valve 2 circuit poor electrical connection

How to Fix the DTC P16D1 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P16D1 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P16D1 Buick Code

1. What does the OBDII code P16D1 mean on a Buick?

The P16D1 code indicates that the Intake Rocker Arm Solenoid Valve 2 is stuck in the "on" position, causing improper engine operation.

2. What are common symptoms of a P16D1 code in a Buick?

Symptoms may include rough idling, reduced fuel efficiency, engine hesitation, increased emissions, and an illuminated check engine light.

3. What causes the P16D1 code to appear on a Buick?

The most common causes are debris in the solenoid, a malfunctioning solenoid valve, electrical issues like damaged wiring or connectors, or a failed ECM.

4. Can I drive my Buick with a P16D1 code?

While the vehicle may still run, driving with this code can worsen performance, reduce fuel efficiency, and potentially cause damage to the engine over time.

5. How is the P16D1 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the solenoid for physical damage or debris, check wiring and connectors, and perform tests to verify solenoid function.

6. What repairs are needed to fix a P16D1 code on a Buick?

Repairs may include cleaning or replacing the intake rocker arm solenoid valve, repairing damaged wiring or connectors, and in rare cases, reprogramming or replacing the ECM.

7. How much does it cost to fix a P16D1 code on a Buick?

Repair costs can vary, but replacing the solenoid valve typically costs between $150 and $400, including parts and labor.

8. Can a dirty engine oil cause a P16D1 code?

Yes, dirty or degraded oil can cause sludge buildup, potentially leading to a stuck solenoid. Regular oil changes can help prevent this issue.

9. Will clearing the P16D1 code solve the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be fixed to prevent the code from returning.

10. How can I prevent the P16D1 code from occurring again?

Regular maintenance, including timely oil changes and using the correct oil type, can help prevent solenoid-related issues and keep the valve operating smoothly.