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Severity: Minor Code type: Manufacturer-specific (Jeep)

Jeep P1495 Code: Leak Detection Pump Solenoid Circuit

The PCM found an open or short in the circuit that fires your Jeep's EVAP leak detection pump solenoid.

At a glance

Severity: 1/5 – Minor1/5

Severity: Minor

Meaning
Leak Detection Pump Solenoid Circuit
System
Emission Controls · Powertrain
Safe to drive?
Yes, short term
Typical repair cost
$0–$1,100
DIY difficulty
Moderate

Older Jeeps with a vacuum-driven leak detection pump (Cherokee XJ, Wrangler TJ, Grand Cherokee ZJ and WJ, early Liberty) use a small solenoid inside the pump to let engine vacuum pull the diaphragm up. The solenoid gets a fused 12-volt feed and the PCM completes the circuit to ground each time it wants the pump to stroke. P1495 is an electrical code: the PCM's driver sees a voltage on that control line that doesn't match what it commanded, which means an open circuit, a short to ground or a short to power somewhere between the fuse, the pump and the PCM. Because the pump can't be stroked, the EVAP leak test is suspended and P1494 often sets as a side effect.

Can I keep driving? The engine runs normally and nothing is at risk mechanically, so driving is fine. Fix it before your next emissions test, and keep the connector dry if it's already corroded.

How to read P1495

How to read P1495P11243954
  1. P Powertrain
  2. 1 Manufacturer-specific
  3. 4 Auxiliary emission controls
  4. 95 Specific fault

Symptoms

  • Check engine light on
  • No change in how the engine runs
  • EVAP monitor never reports ready
  • P1494 stored at the same time
  • Code may come and go after rain or car washes if the connector is corroded

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Corroded or water-filled LDP connector in its exposed spot near the canister 30%
  2. Open solenoid coil inside the leak detection pump 25%
  3. Blown fuse or lost 12-volt feed to the pump 16%
  4. Harness chafed or torn on the frame, skid plate or exhaust 14%
  5. Wiring damaged by off-road use, lift kits or hitch installation 10%
  6. Faulty solenoid driver in the PCM 5%

Diagnosis step by step

Diagnostic flow: P14951Check the fuse and feed first2Open and clean the connector3Measure the solenoid coil4Test the control wire to the PCM5Actuate the solenoid with a scantool

  1. Check the fuse and feed first

    Find the fuse that feeds the leak detection pump in the owner's manual or fuse box diagram and check it with a test light, not just by eye. With the key on and the pump unplugged, the feed pin on the harness side should show battery voltage.

    Tools: Multimeter

  2. Open and clean the connector

    Unplug the LDP and look for green corrosion, pushed-back terminals or water. These connectors live low on the vehicle and take road spray and mud; clean the pins, check terminal tension and use dielectric grease on reassembly.

    Tools: Screwdriver, Flashlight

  3. Measure the solenoid coil

    Measure resistance across the two solenoid pins on the pump. Compare the reading with the service specification for your model; an open (OL) reading means a failed solenoid, and a reading near zero means a shorted coil that can also stress the PCM driver.

    Tools: Multimeter

  4. Test the control wire to the PCM

    With the battery disconnected and the PCM connector unplugged, check the control wire for continuity end to end and for any short to ground. Pay attention to spots where the harness runs along the frame or near a lift kit, skid plate or hitch.

    Tools: Multimeter

  5. Actuate the solenoid with a scan tool

    Reconnect everything and command the LDP solenoid on and off. You should hear or feel it click in time with the command; if it clicks but the code returns, recheck the wiring under movement, and if the circuit tests good but the PCM can't drive it, suspect the PCM.

    Tools: OBD-II scanner

Where the parts are

EVAP system: gas cap, canister, purge and vent valves – P1495123456
EVAP system: gas cap, canister, purge and vent valves
  1. 1Gas cap
  2. 2Charcoal canister
  3. 3Purge valve
  4. 4Vent valve
  5. 5Fuel pump
  6. 6Intake manifold

Repair options & costs

RepairDIY?Estimated cost
Clean and seal LDP connector, replace fuse Yes $0–$80
Replace leak detection pump (open or shorted solenoid) Yes $120–$380
Repair LDP harness No $100–$300
Replace or repair PCM (rare) No $400–$1,100

Rough US estimates for parts and labor; shop rates vary by region. Not a quote.

Emissions / smog test impact

Will fail

With P1495 the EVAP monitor can't run and the check engine light is on, so the Jeep will fail an OBD emissions test in states that test vehicles of this age until the circuit is repaired and the monitor completes.

Frequently asked questions

Why do I also have P1494?

If the solenoid can't be switched, the pump never strokes and its switch never changes state, so the PCM also logs P1494. Repair the P1495 circuit first; P1494 usually goes away with it.

Did my lift kit cause this?

It can. Lifts, skid plates and hitch work change how the rear harness is routed and can stretch or pinch the LDP wiring. Check the harness where it crosses the frame near any recent modification.

Can I just unplug the pump?

Unplugging it guarantees P1495 and an incomplete EVAP monitor, so the check engine light stays on and the vehicle fails an OBD emissions test. It doesn't save anything.

Is the solenoid sold separately?

Generally no. The solenoid, diaphragm and switch are one unit, so an open coil means replacing the leak detection pump assembly.

Sources