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Home / DTC / P3471 — Cylinder 9 Exhaust Valve Control Circuit Low

P3471 — Cylinder 9 Exhaust Valve Control Circuit Low

Detailed page for trouble code P3471.

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Code

P3471

Generic P — Powertrain

Cylinder 9 Exhaust Valve Control Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 15 EN: 23 RU: 21
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Page language: EN

Causes

  • Open or shorted wiring in the exhaust valve control circuit
  • Poor or corroded connector or terminal at the actuator or PCM
  • Failed exhaust valve actuator/solenoid (stuck or electrically shorted)
  • Blown fuse or faulty relay supplying the actuator circuit
  • Faulty PCM/ECM driver output

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • Rough idle or misfire feel under certain conditions (if valve stuck)
  • Reduced performance or poor fuel economy
  • Stored DTC P3471 (may be accompanied by related camshaft/exhaust codes)

What to check

  • Read freeze frame and pending codes, note operating conditions when fault occurred
  • Visually inspect harness and connector at cylinder 9 exhaust valve actuator for damage, corrosion, or oil contamination
  • Check engine fuses and relays related to valve actuators
  • Backprobe the actuator connector with key ON and while commanding the actuator (scan tool)
  • Measure actuator coil resistance with connector disconnected
  • Swap actuator/connectors with a known-good cylinder (if available and applicable) to see if code follows the actuator or stays on cylinder 9

Signal parameters

  • Key ON (engine off): control circuit supply should show battery voltage on the feed side (approx. 11–14 V)
  • When PCM commands actuator: driver output normally switches/pulses (PWM) or grounds the coil — voltage at the harness may vary but should not be persistent 0 V unless commanded and expected
  • Actuator coil resistance: typically low-ohm range (vehicle dependent) — commonly ~5–60 ohms for solenoids; consult vehicle spec
  • Cranking/actuation current: expected small amps (often 0.1–2 A) depending on design; a short to ground will show excessive current, an open will show no current

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data; note conditions when DTC set.
  2. Perform a visual inspection of wiring, connectors, and actuator for damage, corrosion, or oil intrusion at cylinder 9.
  3. Check related fuses/relays for the valve actuator circuit; replace if blown and re-test.
  4. With connector disconnected, measure coil resistance of the exhaust valve actuator and compare to manufacturer spec (if unknown, compare to other cylinder actuator).
  5. Backprobe the actuator connector with a multimeter or oscilloscope: verify feed voltage (key ON) and monitor signal while commanding the actuator with a scan tool. Look for PWM or switching and proper voltage levels.
  6. Wiggle test harness while monitoring signal for intermittent shorts/opens.
  7. If actuator wiring and connector appear correct, swap the actuator with another cylinder (if identical) to see if the fault follows the actuator or stays with cylinder 9.
  8. If fault stays on circuit, disconnect actuator and check continuity and resistance between the harness connector and PCM pin for opens/shorts; check for shorts to ground or battery.
  9. If wiring is good and actuator is good, test or inspect PCM driver output; consult manufacturer procedures for PCM bench testing or replacement.
  10. Repair/replace the faulty wiring, connector, actuator, fuse, or PCM as indicated. Clear codes and perform functional test and road test to confirm repair.

Likely causes

  • Corroded/loose connector at cylinder 9 exhaust actuator
  • Wiring short to ground between the PCM and actuator
  • Failed actuator coil (low internal resistance or open)
  • Missing power feed or ground due to blown fuse or damaged harness
  • PCM driver transistor failure

Fault status

⚠️ Status
PCM reports low voltage/low signal in cylinder 9 exhaust valve control circuit — actuator not receiving expected control signal.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P3470 P3472 P3473 P3474 P3475
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