The P0660 trouble code indicates a malfunction in the intake manifold tuning valve control circuit for bank 1. This valve, controlled by the engine control module (ECM) or powertrain control module (PCM), adjusts the intake manifold’s length to optimize engine performance at different RPMs. If the ECM or PCM detects a fault in the control circuit for bank 1, it triggers this trouble code.
Intake Manifold Tuning Valve Control Circuit Bank 1
Code symptoms P0660.
1. Illumination of the Check Engine Light (CEL).
2. Engine may run rough or experience hesitation during acceleration.
3. Decreased engine performance, particularly at low or high RPMs.
4. Reduced fuel efficiency.
5. Other related trouble codes may be present.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0660.
1. Faulty intake manifold tuning valve or actuator.
2. Wiring harness issues, such as shorts, open circuits, or damaged wires.
3. Poor electrical connections or corrosion at the intake manifold tuning valve connector.
4. ECM or PCM failure (rare).
Code Solutions P0660.
1. Visually inspect the wiring harness and connector leading to the intake manifold tuning valve for any signs of damage, corrosion, or loose connections. Repair or replace damaged components as necessary.
2. Use a digital multimeter to test the continuity and resistance of the wiring harness. Repair any open circuits or shorts found during testing.
3. Check the intake manifold tuning valve and actuator for proper operation. Replace the valve if it is faulty.
4. Clear the trouble codes and perform a test drive to verify if the issue persists. If the code returns, further diagnosis may be required.
5. If all wiring, connectors, and components check out, the ECM or PCM may be faulty and require replacement. However, this is rare and should only be considered after ruling out other potential causes.
6. Follow manufacturer-specific diagnostic procedures outlined in the vehicle’s service manual to accurately diagnose and repair issues related to the intake manifold tuning valve control circuit bank 1. If needed, seek assistance from a qualified technician or dealership.