P3495

Code

Generic P — Powertrain

Cylinder 12 Exhaust Valve Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 41 RU: 30

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Open or shorted wiring in the exhaust valve control circuit (short to ground)
Poor or corroded connector or terminal at the valve solenoid/actuator
Faulty exhaust valve solenoid/actuator (stuck, internal short)
Blown fuse, bad power supply or relay for the valve control circuit
Faulty ECM/PCM driver output
Mechanical failure in the valve/timing actuator preventing normal electrical response

Read and record freeze-frame and related codes with a scan tool
Visual inspection of wiring harness and connector at cylinder 12 exhaust valve solenoid
Check fuses and relays for the valve control power feed
Backprobe solenoid connector to measure supply voltage and driver output
Measure solenoid resistance with connector disconnected (power off)
Check for continuity to ground and short to battery on control wire

Ignition ON (engine off): supply feed should be near battery voltage (~11–14 V) at the solenoid power pin
Driver output when inactive: typically near battery voltage (open/high); when active: pulled low toward ground (~0–1 V)
Typical solenoid coil resistance (varies by design): roughly 5–50 ohms (check OEM spec)
Operating current when energized: often 0.2–2 A depending on actuator (use OEM spec)
Driver duty-cycle or pulse width varies with cam control commands; a scope will show a pulsed waveform when commanded

Use a scan tool to confirm P3495 and check for related codes (other exhaust valve/camshaft codes, cylinder misfire codes). Record freeze-frame data.
Visually inspect the connector and wiring to cylinder 12 exhaust valve solenoid for damage, corrosion, or loose terminals. Repair any obvious issues.
With ignition OFF, disconnect the solenoid connector and measure resistance across the solenoid coil. Compare to OEM specification. If open or shorted, replace the solenoid.
Check for unwanted continuity between the control/driver wire and ground (short to ground) and between the control wire and battery positive (short to power).
With ignition ON (engine off), backprobe the connector to verify the power supply pin has battery voltage and the control/driver pin is high (near battery voltage) when not commanded.
Start the engine or command the valve with a bi-directional scan tool and observe the driver signal at the connector with a multimeter or scope. When commanded, driver should pull low or show PWM per OEM spec.
If wiring and connector are good and the solenoid tests OK but driver output is not correct, inspect the ECM ground and power supplies. Consider substituting a known-good solenoid to confirm.
If all component and wiring tests pass and the subsystem still fails, consider ECM/PCM driver fault — consult manufacturer procedures before replacing ECM.
After repairs, clear codes and perform a road/test cycle to confirm P3495 does not return and that engine operates normally.