Powertrain
generic / SAE
P0644
Driver Display Serial Communication Circuit
The serial communication line to the driver display (instrument cluster, MIL/check-engine warning) shows a circuit fault. Driver may not see warning lights as expected.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 44
Possible causes
- Harness or driver fault high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.5–2 h
- Component: driver display communication
- MIL / check engine light
Sources
References
sae:J2012