P3462

Code

Generic P — Powertrain

Cylinder 8 Exhaust Valve Control Circuit Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 33 RU: 27

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Page language: EN

Causes

Faulty exhaust camshaft actuator / solenoid for cylinder 8
Open, shorted or corroded wiring/connectors at the valve control solenoid
Poor power supply or ground to the solenoid circuit
Stuck cam phaser or mechanically seized exhaust valve mechanism
Low engine oil pressure or contaminated oil affecting phaser/solenoid operation
Intermittent connection or harness damage (chafing, pinched wires)

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Rough idle or misfire-like symptoms under some conditions
Reduced engine power or hesitation during acceleration
Poor fuel economy and increased emissions
Engine may enter limp mode on some vehicles
Intermittent faults that clear after restart if electrical connection is intermittent

What to check

Read and record freeze frame and any other stored codes (look for related camshaft/crank codes)
Inspect wiring and connector at cylinder 8 exhaust valve solenoid for damage, corrosion, or disconnected pins
Verify engine oil level and condition; check for service history of frequent oil changes
Backprobe solenoid connector with a multimeter/oscilloscope while commanding the solenoid from a scan tool
Measure solenoid coil resistance and compare with manufacturer spec
Check for battery voltage at the power feed and continuity to ground at the connector

Signal parameters

Control signal: ECM typically uses a PWM ground driver; expected command waveform: 0–12 V PWM (duty cycle varies with command)
At rest (no command): solenoid control should be near battery voltage (open) or 0 V depending on circuit design — confirm with vehicle wiring diagram
When commanded: backprobe should show a switching ground or PWM waveform; verify PWM frequency and duty vary with command
Coil resistance: typical solenoid coils often measure roughly 5–50 ohms (vehicle-specific — check factory spec)
Supply voltage: battery voltage at power feed ~11–14 V with ignition on
Ground continuity: near 0 ohms from connector ground to chassis ground

Diagnostic algorithm

Connect a capable scan tool, retrieve codes and freeze-frame data. Note operating conditions when fault set.
Visually inspect the solenoid connector, wiring harness, and nearby components for damage, oil contamination, or corrosion.
Verify engine oil level and condition; correct if low or heavily contaminated and retest (some cam phasers rely on clean oil).
Backprobe solenoid connector while commanding the exhaust valve control from the scan tool. Observe voltage/PWM, compare to expected behavior.
Measure solenoid coil resistance with connector disconnected. Compare to specification. If out of range, replace solenoid.
Check for battery voltage at the power feed terminal and for a good ground. Repair any supply or ground issues.
Perform a wiggle/test while monitoring live data to find intermittent wiring faults. Repair or replace damaged wiring or connectors.
If electrical checks pass, swap the suspect solenoid with another cylinder (if identical) to see if the code follows the component.
If mechanical symptoms persist (no movement from actuator) inspect cam phaser/valve train for seizure or mechanical damage; perform mechanical timing checks if needed.
If all components and wiring check good and the issue remains, suspect a faulty ECM driver; confirm with manufacturer guidance before replacing ECM.
After repairs, clear codes and road test under similar conditions to confirm the fault does not return.

Likely causes

Failed exhaust camshaft actuator/solenoid on cylinder 8
Damaged connector or wiring (open/short) between ECM and solenoid
Insufficient oil pressure or dirty oil preventing solenoid action
Poor ground or blown fuse feeding the control circuit
Seized cam phaser or stuck valve timing actuator

Fault status

⚠️ Status

P3462 — Cylinder 8 Exhaust Valve Control Circuit Performance. ECM detected abnormal performance or lack of expected response from the exhaust valve control (camshaft actuator/solenoid) on cylinder 8. MIL set; performance/efficiency and emissions may be affected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-4 hours