P1601
Serial Communication Malfunction
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)
Symptoms
- Check Engine Light Is On
- Incorrect operation of some vehicle systems
- Problems starting the engine
- Dashboard malfunctions
- Lost connection with diagnostic equipment
Causes
- Broken or damaged serial bus wires
- Short circuit in communication circuit
- Oxidized or damaged connectors
- Malfunction of one of the ECU modules
- Problems with power supply to communication modules
How to Fix
- Check the condition of the serial bus wiring harness
- Inspect and clean all connectors in the communication circuit
- Check power and ground of communication modules
- Diagnose each system module for faults
- If necessary, replace damaged wires or connectors