P340D

Code

Generic P — Powertrain

Deactivation/Exhaust Valve Control Circuit Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 17 EN: 31 RU: 19

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Page language: EN

Causes

Open or short in the valve control wiring (power, ground, or signal)
Corroded, loose, or damaged connector at the actuator/solenoid or ECM
Failed deactivation/exhaust valve actuator or solenoid on Bank 2
ECM/PCM driver output failure
Intermittent connection due to chafing or broken wire
Low system voltage or poor battery/charging system condition

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine performance or limp-home mode
Rough idle or misfire-like symptoms on Bank 2
Reduced fuel economy
Unusual valve or ticking noise from cylinder head area
Poor cold-start behavior or irregular valve timing

What to check

Read freeze frame and full list of stored codes; note conditions when code set
Inspect connector at Bank 2 actuator/solenoid for corrosion, bent pins, damage
Visually inspect wiring from actuator to ECM for chafing, breaks, or pinched areas
Check battery voltage and charging system under load
Backprobe connector with key ON to confirm supply voltage and ground presence
Measure solenoid/actuator coil resistance at the connector (compare to spec)

Signal parameters

Expected supply voltage at actuator: approx. battery voltage (~11–14.5 V) with ignition ON
Expected control signal: PCM-driven pulsed ground or switched 0–12 V (depends on vehicle)
Typical actuator/solenoid coil resistance: commonly in the range 5–30 ohms (verify OEM spec)
Command duty cycle/frequency: varies by system; may be steady ON/OFF or PWM up to a few hundred Hz
No-load continuity between actuator supply and ECM should be low ohms; open/infinite = fault
Short to ground or short to battery will show near 0 ohms to respective rail

Diagnostic algorithm

Retrieve/comfirm code P340D and any related codes; record freeze-frame data and conditions when code set.
Visually inspect Bank 2 exhaust valve actuator/solenoid connector and wiring for damage, corrosion, pin-back, or water intrusion.
With ignition ON (engine OFF), backprobe the connector: verify battery supply to the solenoid and a chassis or PCM ground as appropriate. Compare to signal_params.
Measure actuator coil resistance at the connector (power disconnected). If resistance is open or out of expected range, replace actuator/solenoid.
With a lab scope or DVOM, monitor the PCM control signal while commanding the valve (using a scan tool) or during start/run. Confirm PCM is commanding; note voltage waveform, duty cycle, and frequency.
Perform a wiggle test on harness/connectors while monitoring signal to reproduce an intermittent fault. Repair any broken wires or poor connections.
If PCM does not command but wiring and actuator are good, check for short to voltage/ground in circuit wiring. Isolate harness and retest.
If wiring and actuator are confirmed good but no proper command, consider PCM driver failure—verify other PCM outputs and consult manufacturer procedures before replacing PCM.
Clear codes and road-test; if code returns, proceed with component replacement as supported by test results (replace actuator/repair wiring/replace PCM).
After repair, confirm system operation with scan tool and verify no related codes remain.

Likely causes

Faulty exhaust valve solenoid/actuator on Bank 2
Open circuit or high resistance in the solenoid ground or supply
Short to voltage or short to ground in the control circuit
Connector corrosion or pin push-out at the actuator or ECM
ECM driver transistor failed (rare but possible)
Wiring harness damage near the head or harness clips

Fault status

⚠️ Status

Circuit fault detected for Deactivation / Exhaust Valve Control — Bank 2. Check actuator, wiring and ECM control circuit for open/short/intermittent condition.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours