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P3496 — Cylinder 12 Exhaust Valve Control Circuit High

Manufacturer-specificPowertrain (engine & transmission)

P3496 indicates the powertrain control module has detected a higher-than-expected voltage on the electrical circuit controlling the cylinder 12 exhaust valve solenoid. This solenoid typically directs oil flow for cylinder deactivation or variable valve lift events. A circuit-high reading usually points to an internal solenoid fault, a short-to-voltage in the wiring, or an open-circuit condition.

Symptoms

What causes it — most likely first

1. Faulty cylinder 12 exhaust valve control solenoid

The solenoid coil may become internally open or shorted, or the valve may mechanically seize, causing the circuit resistance to change and the PCM to register a sustained high voltage.

2. Wiring short-to-voltage or open in control circuit

The harness between the PCM and the cylinder 12 solenoid may be chafed, pinched, or melted, creating a direct short to a power source or an open that prevents normal circuit pull-down.

3. Corroded or damaged solenoid connector

Moisture intrusion, bent pins, or fretting corrosion in the solenoid connector can increase resistance or create an unintended voltage path, biasing the circuit high.

4. Restricted oil flow or contamination affecting solenoid operation

Debris or sludge can impede the solenoid valve from moving freely, which may alter its electrical load characteristics and contribute to circuit faults under commanded operation.

5. Powertrain control module driver failure

An internal PCM fault that keeps the cylinder 12 exhaust valve driver circuit biased high is possible but statistically rare; it should only be considered after the solenoid and wiring have been thoroughly tested.

How it's diagnosed

  1. Visually inspect the cylinder 12 exhaust valve solenoid connector and wiring for corrosion, bent pins, or insulation damage.
  2. Disconnect the solenoid and measure its coil resistance with a multimeter, comparing the result to factory specifications to detect an open or shorted winding.
  3. With the solenoid unplugged and key-on, probe the control circuit at the harness connector to verify whether an abnormal voltage from a short-to-power is present.
  4. Perform continuity and short-to-battery tests on the control circuit between the solenoid connector and the PCM connector.
  5. If all components and wiring test normal, monitor the circuit with a scan tool or lab scope while commanding the solenoid to verify proper PCM driver switching.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP3490 — Cylinder 12 Deactivationintake Valve CP3491 — Cylinder 12 Deactivationintake Valve CP3492 — Cylinder 12 Deactivationintake Valve CP3493 — Cylinder 12 Exhaust Valve Control CircP3494 — Cylinder 12 Exhaust Valve Control CircP3495 — Cylinder 12 Exhaust Valve Control Circ

Frequently asked

Is this code caused by a bad ignition coil or spark plug?

No. P3496 is strictly an electrical circuit fault for the exhaust valve control solenoid; while secondary misfires can occur, ignition components are not the root cause.

Is it true that the PCM must be replaced to fix P3496?

Usually not. The PCM is rarely the actual cause; most instances are resolved by replacing the affected solenoid or repairing its wiring and connectors.

Can I continue driving with this code active?

Short-distance driving is generally possible, but prolonged operation may reduce fuel economy and could risk valve train damage if the system operates incorrectly; diagnosis should be performed promptly.

Does this code mean the engine has low oil pressure?

Not directly. P3496 reports an electrical circuit fault rather than oil pressure; however, severely contaminated oil can affect solenoid operation and should be evaluated if mechanical issues are suspected.