OBD-II Code
P3402
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$0–$400
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$0 (harness repair) to $400 (solenoid + labor).
P3402 means the ECM detects an open circuit on the cylinder-1 deactivation/intake-valve-control solenoid — no current is flowing through the solenoid coil when the driver commands the activation pulse.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP3402 means the ECM detects an open circuit on the cylinder-1 deactivation/intake-valve-control solenoid — no current is flowing through the solenoid…
P3402 means the ECM detects an open circuit on the cylinder-1 deactivation/intake-valve-control solenoid — no current is flowing through the solenoid coil when the driver commands the activation pulse.
Cheapest-first ladder
- ohm the solenoid across the two harness pins — healthy reading is 8 to 15 ohms cold, infinity means an internally-open coil and condemns the solenoid for $40 to $120 OEM. Inspect the connector at the solenoid for oil contamination (Hemi MDS connectors sit in a low spot on the valley plate and collect oil mist that wicks into the pins and corrodes the contacts) and at the ECM end for backed-out terminals; a single backed-out pin reads as a full open circuit.
- Backprobe the harness with the ignition on, engine off, and check for B+ on one pin and the ECM's ground-side switching on the other — no power means a blown driver or chafed harness, no ground means an ECM driver failure or harness break.
- Scan live data for commanded solenoid state vs actual current — the ECM should command 0.5 to 1.5A; if commanded but not measured, the open is real.
- The expensive misdiagnosis: Chrysler 5.7/6.4 Hemi MDS lifters are the actual problem on 80% of P3400-P3424 codes but P3402 specifically is one of the few that's almost always electrical, not mechanical — a circuit-open code points to wiring or solenoid, and replacing a lifter on a true P3402 misses the actual fault.
Vehicle-specific patternsChrysler 5.7L Hemi (RAM 1500 2009-current, Charger/Challenger R/T 2005-current, Grand Cherokee, Durango, 300C) is the most-Googled P3402 vehicle — th…
Chrysler 5.7L Hemi (RAM 1500 2009-current, Charger/Challenger R/T 2005-current, Grand Cherokee, Durango, 300C) is the most-Googled P3402 vehicle — the MDS solenoid connectors live under the intake plenum and the oil-pan-side harness chafes against the valley-plate edge on high-mileage trucks, so a P3402 on a 150k+ Hemi often resolves to a $0 harness repair, not a solenoid. 6.4L Hemi SRT (392 Charger/Challenger, Grand Cherokee SRT, Durango SRT) shares the same harness routing and chafing failure. GM AFM 5.3L L83 (Silverado/Tahoe/Suburban 2014+), 6.0L (Avalanche/Yukon XL), and 6.2L L86/L87 (Silverado/Sierra/Tahoe/Yukon 2014+) routes the AFM solenoid harness through the lifter-oil-manifold (LOM) assembly under the intake, and a damaged LOM gasket lets oil into the connector and creates an intermittent open circuit. Ford 5.0L Coyote VCT-i (Mustang GT, F150) sets a similar circuit code when the VCT solenoid screen clogs and the ECM's driver shuts down to protect itself — pull the solenoid, clean the screen, reinstall, often $0 in parts. Honda VCM J35 V6 (Pilot, Odyssey, Ridgeline, Accord V6) typically uses rocker-arm-oil-control-solenoid (ROCV) hardware and an open circuit there reads as a P3402-equivalent; common shop fix is the VCM disable harness at ~$120.
Estimated repair$0 (harness repair) to $400 (solenoid + labor).
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