AutoCodes – Cadillac – P1512 Cadillac

P1512 Cadillac Code - Intake Manifold Runner Control Stuck Close

Quick Answer

The commanded throttle position is compared to the actual throttle position based on accelerator pedal position and possibly other limiting factors. Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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: P1512 Cadillac indicates Intake Manifold Runner Control Stuck Close.
Common causes: Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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 810

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1512 Cadillac Description

The commanded throttle position is compared to the actual throttle position based on accelerator pedal position and possibly other limiting factors. Both values should be within a calibrated range of each other. The Powertrain Control Module (PCM) continuously monitors the commanded and actual throttle positions. This Diagnostic Trouble Code (DTC) sets if the values are greater than the calibrated range.

OBDII Code P1512 Cadillac - Intake Manifold Runner Control Stuck Close - AutoCodes.com — P1512 Cadillac Code - Intake Manifold Runner Control Stuck Close

What does this mean?

What are the Possible Causes of the DTC P1512 Cadillac?

Faulty Throttle Body Assembly
Throttle Body Assembly harness is open or shorted
Throttle Body Assembly circuit poor electrical connection

How to Fix the DTC P1512 Cadillac?

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 P1512 Cadillac 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 P1512 Cadillac Code

1. What does the OBDII code P1512 mean on a Cadillac?

P1512 indicates that the Intake Manifold Runner Control (IMRC) system is stuck closed, which can affect engine performance and efficiency.

2. What are the common symptoms of code P1512 in a Cadillac?

Symptoms include reduced engine power, poor acceleration, increased fuel consumption, and occasionally a rough idle or misfire.

3. What causes the P1512 code to appear on a Cadillac?

Common causes include a faulty intake manifold runner control valve, carbon buildup on the intake manifold, disconnected or damaged vacuum lines, or an electrical issue in the IMRC system.

4. Can I still drive my Cadillac with a P1512 code?

While the vehicle may still be drivable, prolonged operation with this code can lead to reduced performance and potential engine damage. Itâ€™s best to address the issue promptly.

5. How can I fix the P1512 code on my Cadillac?

Potential fixes include cleaning or replacing the intake manifold runner control valve, removing carbon buildup, inspecting vacuum lines for leaks, and repairing any damaged wiring.

6. How much does it typically cost to repair a P1512 code on a Cadillac?

Repair costs vary depending on the root cause, but cleaning the IMRC system might cost $100-$300, while replacing the IMRC valve could cost $300-$600 including labor.

7. Can a dirty throttle body cause the P1512 code?

While a dirty throttle body is not a direct cause, it can contribute to airflow issues that may exacerbate problems with the intake manifold runner.

8. How do I know if the IMRC valve is faulty in my Cadillac?

A faulty IMRC valve may result in a stuck position, triggering the P1512 code. Testing the valve for proper movement and electrical functionality can confirm the issue.

9. What tools are needed to diagnose the P1512 code?

Basic tools include an OBDII scanner, a multimeter to check electrical connections, and possibly a vacuum gauge to test for leaks.

10. Can a software update fix the P1512 code on a Cadillac?

In rare cases, a software update from the Cadillac dealership may address IMRC control issues, but this is less common than mechanical or electrical repairs.