Vehicle Moved During EVAP Test
The P1501 code indicates that the vehicle was moved or driven during the EVAP (Evaporative Emission Control) system leak test, which typically occurs after the engine is turned off. The powertrain control module (PCM) monitors fuel tank pressure and expects the vehicle to remain stationary. Movement can cause fuel slosh and pressure fluctuations, aborting the test and setting this code. This is a manufacturer-specific code, often found in Chrysler, Dodge, Jeep, and Ram vehicles.
01. Most Common Causes
- Vehicle moved during EVAP test (e.g., driven, rocked, or towed)
- Faulty EVAP system components causing test to run longer than expected
- PCM software issue or incorrect test conditions
02. Symptoms You Will Notice
- Check Engine Light illuminated
- No drivability issues typically present
- Possible failed emissions test
03. Step-by-Step Diagnosis
Step 1: Clear the code and ensure the vehicle is parked and undisturbed for at least 8 hours before the next cold start.
Step 2: Perform a smoke test on the EVAP system to check for leaks if the code returns.
Step 3: Inspect the fuel cap for proper sealing and replace if necessary.
Step 4: Check for any technical service bulletins (TSBs) related to PCM software updates for the EVAP test.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive. The code indicates the EVAP test was interrupted, not a mechanical failure. However, it may cause a failed emissions test.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and clearing the code. If a component like the fuel cap or purge valve needs replacement, costs can be higher.