What Does P3471 Mean?
The powertrain control module (PCM) has detected a low voltage condition in the control circuit for cylinder 9's exhaust valve. This indicates an electrical fault preventing proper operation of the variable valve timing/lift system for this specific cylinder.
Common Causes
35%
Damaged or chafed wiring causing short to ground in exhaust valve control circuit
30%
Faulty exhaust valve control solenoid for cylinder 9
20%
Corroded or loose electrical connector at valve control solenoid
10%
Failed PCM output driver circuit
5%
Internal short within valve control actuator assembly
Diagnostic Steps
1
Step 1: Visually inspect wiring harness and connector at cylinder 9 exhaust valve solenoid for damage, corrosion, or loose connections
2
Step 2: Disconnect solenoid connector and measure resistance of solenoid; compare to manufacturer specifications (typically 6-12 ohms)
3
Step 3: Check for voltage supply at solenoid connector with key on, engine off; should read battery voltage
4
Step 4: Test circuit resistance from PCM connector to solenoid for short to ground (should read infinite resistance to ground)
5
Step 5: If all circuits test normal, perform PCM output driver test or substitute known-good PCM to verify controller function
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected a low voltage condition in the control circuit for cylinder 9's exhaust valve. This indicates an electrical fault preventing proper operation of the variable valve timing/lift system for this specific cylinder.
The most common cause of P3471 (Cylinder 9 Exhaust Valve Control Circuit Low) is: Damaged or chafed wiring causing short to ground in exhaust valve control circuit
Typical repair costs for P3471 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced power, rough idle, and decreased fuel economy. Continued operation may cause catalyst damage due to improper combustion.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P3471 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Variable Valve Timing System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
