P0662 indicates the powertrain control module (PCM) has detected a high-voltage condition in the control circuit for the intake manifold tuning valve (also called the intake manifold runner control valve) on bank 1. This valve adjusts runner length or airflow to optimize torque across the rpm range. A high circuit code typically means voltage is present on the control wire when the PCM is not commanding the valve on, or the driver circuit is shorted to power.
The solenoid internal winding or driver circuit may be shorted, causing the PCM to detect excessive voltage on the control line.
The control wire between the PCM and valve may be rubbed through, pinched, or melted against a voltage source, pulling the circuit high.
Corroded, spread, or backed-out terminals at the valve or PCM connector can create unintended voltage paths or high resistance that the PCM interprets as a high-circuit fault.
Internal failure of the PCM's low-side driver for this valve can cause the output to float high or leak voltage; this is uncommon and should be confirmed only after wiring and component tests pass.
If the valve's power feed is lost but the control wire remains connected, some PCM strategies may interpret the resulting voltage state as a high-circuit fault.
No. PCM failure is rare for this code; the vast majority of cases are a faulty valve solenoid, a short to power in the control wire, or a connector issue. Replace the PCM only after all circuit and component tests are conclusive.
Carbon buildup typically causes mechanical binding or position-sensor correlation codes (e.g., P2004, P2014), not a control-circuit-high code. P0662 is an electrical fault in the valve's control circuit.
The vehicle is usually drivable, but you may notice reduced low-end torque, hesitation, and poorer fuel economy. Extended driving will not cause immediate engine damage, but the underlying electrical fault should be repaired to restore proper manifold tuning and emissions compliance.
Yes. Manufacturers use different names for the same device — a solenoid-operated valve that changes intake runner length or airflow path. The diagnostic approach is identical regardless of the name used in the service information.