AutoCodes – Cadillac – P146A Cadillac

P146A Cadillac Code - EVAP Purge Pump Speed Too High

Quick Answer

Purge capacity is being reduced by technologies that improve fuel economy. Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump 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: P146A Cadillac indicates EVAP Purge Pump Speed Too High.
Common causes: Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump 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 285

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 Apr 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P146A Cadillac Description

Purge capacity is being reduced by technologies that improve fuel economy. The Evaporative Emission Purge Pump is used to purge stored vapors from the Evaporative Emission Canister and is required to increase the purge volumes to meet LEV 3 Evaporative Emission requirements. The Evaporative Emission Purge Pump has an integral pressure sensor for controlling purge vapors from the canister. The Engine Control Module (ECM) monitors the Evaporative Emission Purge Pump, and the Diagnostic Trouble Code (DTC) will be set when the EVAP Purge Pump Speed is greater than 55,000 RPM for greater than 5 s.

OBDII Code P146A Cadillac - EVAP Purge Pump Speed Too High - AutoCodes.com — P146A Cadillac Code - EVAP Purge Pump Speed Too High

What does this mean?

What are the Possible Causes of the DTC P146A Cadillac?

Faulty Evaporative Emission Purge Pump
Evaporative Emission Purge Pump harness is open or shorted
Evaporative Emission Purge Pump circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P146A 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 P146A 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 P146A Cadillac Code

1. What does the OBDII code P146A mean for a Cadillac?

P146A indicates that the EVAP purge pump is operating at a higher speed than expected, which may suggest an issue within the evaporative emissions control system.

2. What are the common symptoms of code P146A on a Cadillac?

Symptoms may include an illuminated check engine light, increased fuel odor, reduced fuel efficiency, or difficulty passing emissions tests.

3. What causes the EVAP purge pump speed to be too high?

Potential causes include a faulty purge pump, vacuum leaks in the EVAP system, a malfunctioning purge valve, or issues with the EVAP system's sensor or wiring.

4. Can I drive my Cadillac with a P146A code?

While the vehicle may still be drivable, ignoring the issue could lead to decreased performance and potential damage to the emissions system over time.

5. How is the P146A code diagnosed?

A technician will use a scan tool to confirm the code, inspect the EVAP system for leaks or damaged components, and check the purge pump and its electrical connections.

6. How can I fix the P146A code on my Cadillac?

Repairs may involve replacing the EVAP purge pump, repairing vacuum leaks, replacing a faulty purge valve, or fixing damaged wiring in the EVAP system.

7. How much does it cost to repair a P146A code?

Repair costs vary depending on the issue but typically range from $150 to $500, with parts and labor for EVAP components being the primary expense.

8. Can a loose gas cap trigger a P146A code?

A loose or damaged gas cap is unlikely to cause this specific code, but it can cause other EVAP-related codes. Always check the gas cap as part of initial troubleshooting.

9. Will clearing the P146A code with a scan tool fix the problem?

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

10. How can I prevent the P146A code from occurring again?

Regular maintenance of the EVAP system, promptly repairing vacuum leaks, and ensuring the purge pump and related components are in good condition can help prevent recurrence.