P0662
Intake Manifold Tuning Valve Control Circuit High (Bank 1)
Powertrain Fuel and Air Metering Intake valve control 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The intake manifold tuning valve control circuit is sending too much voltage to the ECU, like a dimmer switch stuck on high. This prevents the engine from properly adjusting air intake for different driving conditions.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Rough idle or hesitation during acceleration
Reduced fuel economy and engine performance
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage signal from the intake manifold tuning valve solenoid control circuit. It expects a voltage range that corresponds to proper solenoid operation. When the voltage exceeds the high threshold, the ECU detects a circuit fault and sets the code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Control Circuit Voltage 0.5–4.5V (PWM signal) >4.8V or stuck high
Solenoid Resistance 6–14 ohms Open circuit or short to power
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness and connectors
Inspect the solenoid connector and wiring for corrosion, loose pins, or damage; clean and reseat connections.
2
Intake manifold tuning valve solenoid
Test solenoid resistance with a multimeter; replace if open or out of range.
3
ECU or PCM reprogramming
If wiring and solenoid are good, the ECU may need reflashing or replacement by a dealer.