P3476

Code

Generic P — Powertrain

Cylinder 10 Deactivation/Intake Valve Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 37 RU: 30

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Page language: EN

Causes

Open or shorted wiring in the cylinder 10 intake valve control harness
Corroded, damaged, or poorly seated connector at the solenoid or ECM
Failed cylinder 10 intake valve control / deactivation solenoid
Short to battery voltage (B+) on the control circuit
PCM/ECM output driver fault
Aftermarket modifications or incorrect replacement parts

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Cylinder deactivation for cylinder 10 not functioning
Rough idle, misfire, or reduced power depending on engine design
Reduced fuel economy when deactivation is inhibited
Possible diagnostic trouble codes for misfire or related valve/deactivation circuits

What to check

Retrieve freeze frame and live data; confirm if code is current or historic and note engine conditions when set
Visual inspection of harness, connector, and solenoid at cylinder 10 for damage, corrosion, or fluid intrusion
Backprobe the solenoid connector and measure voltage with key ON and while commanding the solenoid ON/OFF (use scan tool)
Measure coil resistance of the intake valve/deactivation solenoid (with connector disconnected)
Perform a wiggle/stress test on wiring while monitoring voltage/scan data
Check for other related trouble codes that may indicate a grounding or battery feed issue

Signal parameters

Typical coil resistance (varies by engine): roughly 6–40 ohms; consult vehicle service data for exact value
If ECM is a low-side driver (common): with circuit commanded OFF (open), expect near battery voltage at the solenoid feed; with commanded ON expect the control circuit voltage to drop near 0–1 V
If ECM is a high-side driver (less common): with command ON expect near battery voltage; with OFF expect near 0 V
‘High’ fault conditions often show voltage near battery (or higher-than-expected) when the ECM is commanding the circuit to be low
No-load voltage at the harness pin should not exceed battery voltage; transient spikes above battery may indicate electrical fault

Diagnostic algorithm

Read and record freeze-frame and freeze data; verify P3476 is current by clearing codes and reproducing conditions.
Visually inspect cylinder 10 solenoid, connector, and wiring for damage, corrosion, oil or coolant contamination, and secure routing.
With ignition ON (engine OFF), backprobe the solenoid connector. Using a DVOM, check for battery feed voltage and for the ECM control voltage while commanding the solenoid ON/OFF with a scan tool. Note values and compare to expected behavior.
Disconnect the solenoid and measure coil resistance. Replace the solenoid if resistance is open, out-of-spec, or shows a short to ground/B+.
If coil resistance is normal, check continuity between the solenoid pin and the ECM pin for shorts to battery or ground and for high resistance. Repair any damaged wiring or terminals.
If wiring and solenoid are good, inspect ECM connector pins for corrosion, bent pins, or damage. Perform wiggle tests and re-scan for intermittent faults.
If wiring, connector and solenoid check good but the ECM still reads a high circuit, consider ECM driver failure. Confirm with manufacturer diagnostic procedures before replacing the ECM.
After repairs, clear codes and verify repair by re-testing under the same conditions that set the fault.

Likely causes

Damaged connector or wiring to the cylinder 10 intake valve control solenoid (most likely)
Failed/shorted intake valve control solenoid for cylinder 10
Short to battery voltage in the harness (pinched or chafed wire)
PCM/ECM driver internal failure (least likely)

Fault status

⚠️ Status

P3476 — Cylinder 10 Deactivation/Intake Valve Control Circuit High: ECM detected higher-than-expected voltage on the cylinder 10 intake valve/deactivation solenoid control circuit, indicating a possible wiring, connector, solenoid, or ECM driver fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours