P0442 2017 GMC Sierra Code - Evaporative Emission System Small Leak Detected
Quick Answer
The P0442 code indicates that the evaporative emission control system has detected a small leak. Common causes include Loose or damaged gas cap, Cracked or disconnected hoses, Faulty purge 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
- P0442 2017 GMC Sierra indicates Evaporative Emission System Small Leak Detected.
- Common causes
- Common causes include Loose or damaged gas cap, Cracked or disconnected hoses, Faulty purge 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.
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Code P0442 2017 GMC Sierra Description
The P0442 code indicates that the evaporative emission control system has detected a small leak. This system is designed to prevent fuel vapors from escaping into the atmosphere and is crucial for reducing vehicle emissions. When a small leak is detected, it means that the system is not able to maintain the required pressure, leading to potential emissions of harmful gases.
Common Causes of P0442 2017 GMC Sierra
- Loose or damaged gas cap
- Cracked or disconnected hoses
- Faulty purge valve
- Cracked charcoal canister
- Leaking fuel tank
Symptoms of P0442 2017 GMC Sierra
- Check engine light illuminated
- Fuel odor inside or outside the vehicle
- Decreased fuel efficiency
- Failed emissions test
How to Fix P0442 2017 GMC Sierra
- Check the gas cap and ensure it is properly tightened or replace it if damaged.
- Inspect and replace any cracked or disconnected hoses in the evaporative emission system.
- Test the purge valve to ensure it is functioning properly and replace it if necessary.
- Inspect the charcoal canister for cracks and replace it if damaged.
- Check the fuel tank for leaks and repair or replace it if necessary.
Cost to Fix P0442 2017 GMC Sierra
The cost of repairing a P0442 code can vary depending on the specific cause of the issue and the labor rates at the repair shop. Generally, repairing a small leak in the evaporative emission system can cost anywhere from $100 to $500, including parts and labor. It's important to consider that diagnostic time and labor rates can vary, so it's recommended to get a specific estimate from a qualified mechanic.
Tech Notes for P0442 2017 GMC Sierra
There is a factory service bulletin for all the models from 2000 through 2021. The factory states that there are seven critical connections that could likely lead to this DTC being set:
1. Purge tube to purge valve (at intake manifold)
2. Purge tube to chassis EVAP line (at the rear of the engine, near transmission)
3. Chassis EVAP line to canister (at canister)
4. Fuel tank load line to canister (at canister)
5. Vent valve line to vent valve (at vent valve)
6. Fuel tank load line jumper connection (near fuel tank)
7. Fuel tank cap is closed properly (at refuel compartment)
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