P3473

Code

Generic P — Powertrain

Cylinder 10 Deactivation/Intake Valve Control Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 33 RU: 24

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Page language: EN

Causes

Open or broken wiring between ECM and cylinder 10 intake valve control solenoid
Poor, corroded, or disconnected connector at the solenoid
Failed intake valve deactivation/solenoid assembly
Blown fuse or poor ECM power/ground supply
Faulty PCM/ECM or internal driver failure (less common)
Damage from oil intrusion or mechanical damage to the solenoid

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced fuel economy
Rough idle or slight vibration at idle (if cylinder deactivation attempted)
Loss of cylinder deactivation function for cylinder 10
Possible limp-home mode or reduced engine performance (rare)

What to check

Read and record freeze frame and all stored/related DTCs with a scan tool
Visual inspection of connector and wiring at cylinder 10 solenoid for corrosion, oil, or damage
Check for proper fuse(s) and power/ground circuits that feed valve deactivation solenoids
Backprobe solenoid connector and verify voltage and ground with key ON and while commanding with scanner
Measure solenoid coil resistance and compare to manufacturer specification
Wiggle-testing harness while monitoring live data/command to reproduce fault

Signal parameters

Control signal: PWM from ECM, 0–12 V (duty cycle varies when commanded)
Key ON battery voltage present at solenoid supply circuit (usually ~12 V)
Control/driver side should switch to ground when commanded by ECM
Typical solenoid resistance: check OEM spec (commonly in the single-digit to low-double ohm to tens of ohms range)
Open-circuit expected: infinite resistance at solenoid coil

Diagnostic algorithm

Retrieve all codes and freeze-frame data; note any related cylinder deactivation or misfire codes.
Visually inspect the wiring and connector at cylinder 10 solenoid for corrosion, bent pins, oil intrusion, or mechanical damage.
With ignition OFF, disconnect connector and measure solenoid coil resistance between the control and supply terminals; compare to OEM spec. An open (infinite) reading suggests a failed solenoid.
With key ON (engine OFF) backprobe the harness: verify battery voltage at the supply terminal and verify the control terminal is not open to the ECM ground. If supply is missing, trace fuses/power feed.
Command the solenoid ON/OFF using a capable scan tool while monitoring voltage/current. Observe whether the ECM attempts to switch the control (PWM/ground).
If the ECM is commanding but no solenoid response and wiring is good, replace the solenoid assembly on cylinder 10 and retest.
If no command from ECM or open circuit in wiring, perform continuity checks from solenoid connector to ECM pin and repair any open/shorts; ensure good grounds.
After repair or replacement, clear codes, perform relearn procedures if required by manufacturer, and verify fault does not return during a road/drive cycle.

Likely causes

Disconnected or corroded connector at cylinder 10 solenoid
Wiring harness chafed or broken near engine
Solenoid coil open (failed solenoid)
Fault in power/ground feed to the bank of deactivation solenoids

Fault status

⚠️ Status

Open circuit detected in the cylinder 10 intake valve control / deactivation solenoid circuit. ECM cannot control intake valve deactivation for cylinder 10 until wiring, connector, or solenoid fault is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours