P146A GMC 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 GMC 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.
Code P146A GMC Description
What are the Possible Causes of the DTC P146A GMC?
- 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 GMC?
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 GMC 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.
Need more information about the P146A GMC code?
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Information for Specific GMC Models
- P146A 2019 GMC Sierra — EVAP Purge Pump Speed Too High
- P146A 2020 GMC Sierra — EVAP Purge Pump Speed Too High
- P146A 2021 GMC Sierra — EVAP Purge Pump Speed Too High
- P146A 2022 GMC Sierra — EVAP Purge Pump Speed Too High
Frequently Asked Questions about P146A GMC Code
1. What does the OBDII code P146A mean for a GMC vehicle?
P146A indicates that the EVAP purge pump is operating at a speed higher than the manufacturer’s specified range, suggesting a potential issue with the evaporative emissions system.
2. What are the common symptoms of code P146A in a GMC?
Symptoms may include an illuminated check engine light, increased fuel odor, reduced fuel efficiency, or failing an emissions test.
3. What causes the P146A code to appear on a GMC?
Common causes include a faulty EVAP purge pump, clogged or damaged EVAP hoses, a malfunctioning purge valve, or electrical issues like damaged wiring or poor connections.
4. Can the P146A code cause drivability issues in a GMC?
Typically, this code does not directly impact drivability but can lead to emissions problems and potentially more severe EVAP system issues if left unaddressed.
5. How can I diagnose the P146A code on my GMC?
Diagnosis involves checking the EVAP purge pump for proper operation, inspecting EVAP hoses for blockages or damage, and testing the electrical connections and wiring for continuity.
6. How do I fix the P146A code on a GMC vehicle?
Repairs may include replacing the EVAP purge pump, repairing or replacing damaged hoses, fixing electrical wiring issues, or replacing the purge valve if it’s faulty.
7. Is it safe to drive my GMC with the P146A code?
You can usually drive with this code, but it’s best to address it promptly to avoid potential emissions-related issues and ensure your vehicle passes inspections.
8. How much does it cost to repair the P146A code on a GMC?
Repair costs vary but typically range from $100 to $500 depending on whether the EVAP purge pump, hoses, or other components need replacement.
9. Can a loose gas cap trigger the P146A code on a GMC?
While a loose gas cap is a common cause for some EVAP codes, it is unlikely to trigger P146A, which is specific to the purge pump speed.
10. Will clearing the P146A code solve the problem permanently?
Clearing the code may temporarily turn off the check engine light, but the issue will return if the underlying problem is not resolved.
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