U011B

Lost Communication With Rocker Arm Control Module A

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unstable idling
Engine does not go to full power

Causes

Open or short circuit in the module communication circuit
Malfunction of the rocker control module
Problems with module power supply (blown fuse)
Poor contact in module connectors
Main control unit (ECU) malfunction

How to Fix

Check fuses associated with the VVT system
Inspect the wiring harness and module connectors for damage.
Check the power and ground of the control module
Test the rocker control module
If necessary, replace the control module

Related codes

U011A U011C U011D