P1604
Loss Of IPC Serial Data Conditions
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)
Symptoms
- Some indicators on the dashboard do not work
- Speedometer or tachometer does not function
- The Check Engine light comes on
- No dashboard backlight
- Problems with the on-board computer
Causes
- Broken or damaged wires between the ECU and IPC
- Corrosion of contacts in connectors
- Instrument cluster malfunction
- Dashboard power problems
- Failures in ECU software
How to Fix
- Check the integrity of the wiring between the ECU and IPC
- Clean and check all connections
- Instrument cluster power diagnostics
- Check the operation of the dashboard
- Update or reflash the ECU software