P1467 on 2019-2020 Chevy Silverado 1500: EVAP Purge Pump Fault Causes and Fixes

What's Unique About the 2019-2020 Chevrolet SILVERADO 1500

For the 2019-2020 Silverado 1500, which was a new generation, this code is very frequently caused by a software bug, not a hardware failure. General Motors acknowledged this by issuing Technical Service Bulletin #19-NA-148 🎬 Watch: A quick overview of why your Chevy set DTC P1467. to address a "software anomaly" that could falsely trigger the P1467 code on 2019 models with the 2.7L L3B engine. Subsequently, GM also identified that the pump itself could fail, sometimes due to liquid fuel intrusion from over-filling the tank, and issued Special Coverage N202324990, extending the warranty on this part to 15 years or 150,000 miles for both 2019 and 2020 models.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Check Engine Light (Malfunction Indicator Lamp) is illuminated
• OnStar/myChevrolet app may send a diagnostic alert stating "Service the emissions system"

Most Likely Causes

1. Engine Control Module (ECM) Software Anomaly 🔴 High Probability GM issued Technical Service Bulletin #19-NA-148 specifically identifying a software bug as the cause for this code on 2019 models with the 2.7L L3B engine. This is the first step in the official diagnostic procedure.
   How to confirm: A GM dealer or qualified shop must use a scan tool (like the GM MDI2) to check the current software calibration of the ECM and determine if an update is available per the TSB.
   Typical fix: Reprogramming the ECM with the latest software version. This is a non-mechanical repair that takes approximately 0.3 labor hours. This should be covered under the emissions warranty.
   Est. part cost: $0
2. Faulty EVAP Purge Pump 🟡 Medium Probability The EVAP purge pump itself is a known failure point, to the extent that GM issued Special Coverage N202324990. Preliminary Information bulletin PIT5723A suggests that over-filling the fuel tank can cause liquid fuel to enter and damage the pump. GM later released updated pump and canister designs to address this.
   How to confirm: After confirming the ECM software is current, a technician will diagnose the pump. If the pump is determined to be the cause, it is replaced under the special coverage program. A Reddit user confirmed their dealer diagnosed a bad pump after getting code P1467.
   Typical fix: Replace the EVAP Purge Pump. This repair is covered for free at a GM dealer under Special Coverage N202324990 for 15 years/150,000 miles.
   Est. part cost: $0 (if covered), $100-$180 (if not)
3. Wiring Harness or Connector Issue ⚪ Low Probability While less common for this specific code, engine wiring harnesses on these trucks can be prone to chafing. TSB 21-NA-149 documents several potential contact points on the 2.7L engine, such as the camshaft carrier cover and upper control arm, that can cause various electrical issues. TSB 19-NA-148 explicitly notes that the P1467 software issue is *not* related to a different wiring issue outlined in PIT5677.
   How to confirm: Visually inspect the wiring harness and connector leading to the EVAP purge pump for any signs of damage, corrosion, or loose pins. Use a multimeter to check for proper voltage and continuity at the connector. TSB 21-NA-014, for a related code (P146F), details a procedure for checking resistance on the pump's ground circuit.
   Typical fix: Repair the damaged section of the wiring harness or replace the connector pigtail. Secure the harness away from any potential chafing points.
   Est. part cost: $10-$40

Rare But Worth Checking

• Liquid Fuel Intrusion in EVAP Canister:

Diagnosis Steps

1. Connect a professional OBD-II scanner to the vehicle.
2. Verify that P1467 is the active or stored code.
3. Check the vehicle's VIN against GM's Global Warranty Management system to see if Special Coverage N202324990 is open. This should be the first step at a dealership.
4. Check for any available Technical Service Bulletins (TSBs). Specifically, reference TSB #19-NA-148 for 2019 models.
5. Using a GM-compliant scan tool (MDI2), verify if the Engine Control Module (ECM) has the latest software installed.
6. If a software update is available, reprogram the ECM. This is the most likely fix for 2019 models and is covered by warranty.
7. After reprogramming, clear all DTCs and perform a drive cycle to see if the code returns.
8. If the software is already up-to-date or the code returns, the issue is likely the EVAP Purge Pump itself. This replacement is covered by the Special Coverage program.
9. Locate the EVAP Purge Pump. On the 2.7L engine, it is located at the back of the engine, mounted to a bracket.
10. Inspect the pump's electrical connector and wiring harness for any visible damage, corrosion, or loose connections, paying attention to known chafing points.
11. If directed by diagnostics (e.g., for related codes or if the special coverage didn't apply), a technician might test for power and ground at the connector. If power and ground are present but the pump is inoperative, it has failed.
12. If fuel saturation is suspected, the EVAP canister may also be inspected and replaced if necessary, per TSB PIT5723A.

Parts You'll Likely Need

• EVAP Purge Pump (OEM #12721653) — This is the component that is replaced if the software update does not resolve the issue or if the pump is confirmed to be faulty. This part number is specified for the L3B engine in the Special Coverage bulletin. The older part number was 25207556.
  Trusted brands: ACDelco (GM Genuine)
  OEM price range: $100-$181
  Aftermarket price range: $50-$100
• EVAP Canister (OEM #85107747 or 85107748) — May need to be replaced along with the pump if it has been contaminated with liquid fuel from over-filling the tank. The correct part number must be verified with the vehicle's VIN.
  Trusted brands: ACDelco (GM Genuine)
  OEM price range: $150-$250
  Aftermarket price range: $100-$180

Related Codes That Often Appear With This One

• P1469: This code is also mentioned in TSB PIT5723A related to the fuel-damaged EVAP purge pump, indicating it can occur under similar circumstances.

Technical Service Bulletins (TSBs) & Recalls

• 19-NA-148: Malfunction Indicator Lamp (MIL) Illuminated with DTC P1467 set. States the cause for 2019 models may be a software anomaly and the primary correction is to reprogram the ECM. Explicitly states no parts are normally required.
• PIE0544A: An initial engineering informational bulletin from Nov 2019 requesting field data on vehicles setting code P1467, indicating GM's early investigation into the issue. It was later superseded.
• PIT5723A: Service Engine Soon (SES) Lamp Illuminated, DTC P1467 and/or P1469 Set. Identifies that the EVAP purge pump may be filling with liquid fuel due to over-filling the tank and points to Special Coverage N202324990 for the fix.
• N202324990: Special Coverage for the evaporative emissions purge pump. Extends warranty coverage to 15 years/150,000 miles for this specific failure on 2019-2020 Silverado/Sierra 1500 and other models.

Platform-Specific Known Issues

• A known software anomaly on 2019 models can cause this code to set without any actual hardware failure, as documented in TSB #19-NA-148.
• GM has issued Special Coverage N202324990 for the EVAP Purge Pump on 2019-2020 Silverado/Sierra 1500s with the 2.7L engine. This extends the warranty for this specific part to 15 years or 150,000 miles, whichever occurs first.
• TSB PIT5723A notes that over-filling the fuel tank can cause liquid fuel to damage the pump, which prompted an updated part design.

Mechanic-Grade Diagnostic Values

• EVAP Purge Pump Connector Voltage — expected: With the ignition on, one pin should have battery voltage (approx. 12V). The other pin is the control circuit, which the ECM grounds to activate the pump.. Failure: No voltage on the power pin indicates a fuse or wiring issue upstream. If power is present but the pump doesn't run when commanded by a scan tool, and the ground circuit is confirmed good, the pump has failed.

Scan Tool Commands That Help

• GDS2 (GM Techline Connect): Output Control > EVAP System > EVAP Purge Pump — After verifying software is up-to-date, this command is used to manually activate the purge pump. The technician can listen for the pump to run or feel it vibrate. If the pump does not activate despite receiving power and ground commands, it confirms a failed component. This is a critical step before replacing the part.

Wiring & Ground Locations

• Engine Harness Chafe Points — On the 2.7L L3B engine, inspect the harness for rubbing/chafing at these specific locations: 1) Where it crosses over the top of the camshaft carrier cover. 2) At the lower air cleaner housing. 3) At the generator bracket and left-front coil spring stud. 4) At the left-front upper control arm bushing.. TSB 21-NA-149 highlights these as common problem areas for various electrical faults. An intermittent short to ground or an open in the pump's control or power circuit could trigger P1467, and the fault would not be corrected by replacing the pump itself.
• Main Chassis Ground Strap — A braided, uninsulated ground strap located behind the front right (passenger side) splash shield, connecting the chassis to the battery negative path.. This ground is known to corrode and fail, causing a multitude of difficult-to-diagnose electrical problems, including no-starts and random DTCs. While not exclusive to the EVAP system, a poor ground can cause module communication errors and incorrect sensor readings, potentially leading the ECM to falsely report a P1467 code.

Real Owner Repair Stories

• Compilation of multiple forum/Reddit posts (2019-2020 Silverado/Sierra with 2.7L L3B) — Check Engine Light with code P1467.
  ❌ Tried (didn't work) Clearing the code (it returns quickly), Taking it to a non-dealer shop that was unaware of the specific GM Special Coverage program.
  ✅ What actually fixed it The overwhelming majority of owners report a final resolution by visiting a GM dealership. For 2019 models, the fix was typically an ECM software reflash under TSB 19-NA-148. For 2020 models, or 2019s with updated software, the fix was the replacement of the EVAP Purge Pump. Both repairs were completed at no charge to the customer under either the emissions warranty or Special Coverage N202324990.