P1621
Control Module Long Term Memory Performance Condition
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Check Engine Light Illuminates
- Losing saved settings (for example, radio stations)
- Problems starting the engine
Causes
- Engine control unit malfunction
- ECU power problems
- Short circuit in ECU circuit
- Corrosion of control unit contacts
- Software error in ECU
How to Fix
- Check the supply voltage of the control unit
- Inspect ECU connectors and wiring harness
- Check for corrosion on contacts
- Flash or replace the control unit
- Reset the error and check for its reappearance