P146E GMC Code - EVAP Purge System Pressure Sensor Circuit High Voltage
Quick Answer
The EVAP Purge System Pressure Sensor is a 3-wire piezo-resistive pressure transducer integrated into the Evaporative Emission Purge Pump. 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
- P146E GMC indicates EVAP Purge System Pressure Sensor Circuit High Voltage.
- 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 P146E GMC Description
What are the Possible Causes of the DTC P146E 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 P146E 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 P146E 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.
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Frequently Asked Questions about P146E GMC Code
What does the OBDII code P146E mean for a GMC vehicle?
The P146E code indicates that the EVAP Purge System Pressure Sensor Circuit has a high voltage reading, suggesting an issue with the sensor or its electrical components.
What are the common symptoms of the P146E code?
Common symptoms include an illuminated check engine light, failure to pass emissions tests, possible fuel odor, and reduced fuel efficiency.
What causes the P146E code to appear?
The code can be caused by a faulty EVAP purge system pressure sensor, damaged wiring or connectors, a short circuit, or issues with the vehicle’s PCM (Powertrain Control Module).
Can I drive my GMC vehicle with the P146E code?
While the vehicle may still be drivable, it is not recommended as ignoring the issue can lead to increased emissions, fuel system inefficiency, and potential damage to other components.
How do I fix the P146E code on a GMC vehicle?
Repairs may include replacing the EVAP purge system pressure sensor, repairing damaged wires or connectors, or reprogramming the PCM if necessary.
What tools are needed to diagnose the P146E code?
You will need an OBDII scanner, a multimeter to check voltage and continuity, and possibly a smoke machine to test for leaks in the EVAP system.
How much does it cost to repair the P146E code?
The repair cost varies but typically ranges from $100 to $300, depending on whether the issue is a simple wiring repair or a sensor replacement.
Can a loose gas cap cause the P146E code?
A loose gas cap is unlikely to trigger the P146E code specifically, but it can cause other EVAP-related codes. It's still a good idea to check the gas cap as part of your diagnosis.
How do you test the EVAP purge system pressure sensor?
Use a multimeter to measure the sensor’s voltage and compare it to the manufacturer’s specifications. Check the sensor’s wiring for shorts or open circuits.
Does the P146E code require reprogramming the PCM?
Reprogramming the PCM is not always necessary but may be required if the issue persists after replacing faulty components and repairing wiring.
Discuss the causes and fixes for P146E GMC OBDII Code
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