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P2402 EVAP System
Evaporative Emission System Leak Detection Pump Control Circuit High
The control module has detected a higher than expected voltage in the leak detection pump control circuit. This typically indicates an open circuit, a short to power, or a failed pump that is not drawing current as expected.
🚗 Yes. This is an emissions-only fault that does not impact drivability or safety, but repair it to pass emissions inspection.
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🎯 Top Causes, Ranked by Likelihood
#1 Open circuit in control wiring $80-$250
A broken wire or bad splice leaves the circuit open, reading high voltage.
#2 Faulty leak detection pump $120-$300
The pump has an internal open and no longer draws current, causing high circuit voltage.
#3 Short to voltage in wiring $80-$250
The control wire is shorted to a power source, pulling the reading high.
#4 Poor connector contact $40-$150
Corroded or spread terminals create high resistance and a high voltage reading.
🩺 Common Symptoms Check engine light is on No change in engine performance EVAP readiness monitor will not complete Possible failed emissions test 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose P2402 1 Inspect the pump connector and harness for broken, corroded, or backed-out terminals.
2 Check for continuity in the control circuit between the pump and the control module.
3 Measure the pump winding resistance and replace the pump if it reads open.
4 Clear the code and complete an EVAP drive cycle to verify.
❓ Frequently Asked Questions What causes a high control circuit code?
Usually an open circuit or a failed pump that stops drawing current, which leaves the control wire reading high voltage.
Can I keep driving?
Yes. It is an emissions code with no drivability effect. Fix it before your inspection.
Is this an expensive repair?
Often it is just a wiring or connector fix. A pump replacement is the higher-cost outcome.
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