P0446 Cadillac Code - Evaporative Emission Vent System Performance
Quick Answer
This Diagnostic Trouble Code (DTC) tests the Evaporative Emission (EVAP) system for a restricted or blocked EVAP vent path that would cause excess amounts of vacuum to be developed in the EVAP system. Common causes include Plugged vapor canister, Pinched or blocked EVAP hose, Faulty Evaporative Emission Vent Solenoid Valve. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0446 Cadillac indicates Evaporative Emission Vent System Performance.
- Common causes
- Common causes include Plugged vapor canister, Pinched or blocked EVAP hose, Faulty Evaporative Emission Vent Solenoid Valve.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0446 Cadillac Description
What are the Possible Causes of the DTC P0446 Cadillac?
- Plugged vapor canister
- Pinched or blocked EVAP hose
- Faulty Evaporative Emission Vent Solenoid Valve
- Evaporative Emission Vent Solenoid Valve harness is open or shorted
- Evaporative Emission Vent Solenoid Valve circuit poor electrical connection
- Faulty Fuel Tank Pressure (FTP) sensor
How to Fix the DTC P0446 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.
Code Tech Notes
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0446 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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Frequently Asked Questions about P0446 Cadillac Code
1. What does OBDII code P0446 on a Cadillac indicate?
The P0446 code indicates a problem with the Evaporative Emission Vent System Performance in the Cadillac.
2. What are the common symptoms of a P0446 code in a Cadillac?
Common symptoms include the check engine light coming on, rough idling, decreased fuel efficiency, and a gasoline smell near the vehicle.
3. What are the possible causes of a P0446 code in a Cadillac?
Potential causes include a faulty vent valve, a damaged charcoal canister, a leak in the fuel system, or a loose gas cap.
4. How can I diagnose a P0446 code in my Cadillac?
Diagnosing a P0446 code may involve inspecting the fuel cap for tightness, checking the vent valve and canister for damage, and conducting a smoke test to identify any leaks in the system.
5. Can I drive my Cadillac with a P0446 code?
It is generally safe to drive your Cadillac with a P0446 code, but it is recommended to address the issue promptly to prevent potential damage to the emissions system.
6. How can I repair a P0446 code in my Cadillac?
Repair options may include replacing the vent valve, charcoal canister, or any damaged components in the evaporative emissions system.
7. Is it possible to reset a P0446 code in a Cadillac without fixing the issue?
Resetting the code without addressing the underlying problem will only temporarily turn off the check engine light, as the code will reappear once the issue is detected again during vehicle operation.
8. Are there any DIY tips for fixing a P0446 code in a Cadillac?
DIY tips may include checking and tightening the gas cap, inspecting hoses for leaks, and visually inspecting the components of the evaporative emissions system for any obvious damage.
9. How long does it take to repair a P0446 code in a Cadillac?
The repair time for a P0446 code can vary depending on the specific issue, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.
10. Will a P0446 code in a Cadillac affect vehicle performance?
While a P0446 code may not directly impact driving performance, it can lead to decreased fuel efficiency and potential emissions issues if left unresolved.
Discuss the causes and fixes for P0446 Cadillac OBDII Code
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I was receiving PCM 0171 and 0174 codes and was noticing my fuel gauge jump around when down to a quarter of a tank so I replaced the fuel pump and am going to replace the plenum intake in a couple of days. Checked the DTC and had a new code, PCM P0446.
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