P1340moderate severityPowertrain
Misfire Detected Crankshaft Segment Adaptive
on 2000 Audi A6 2.8L V6 · AWD
What this code means
The ECU detected a misfire through crankshaft speed variation analysis using its adaptive algorithm. The system has learned the normal crankshaft speed pattern and detected a deviation indicating cylinder misfires.
Symptoms
- Check Engine Light
- Rough running
- Slight vibration at idle
- Intermittent power loss
Common causes
- Worn spark plugs
- Failing ignition coil
- Fuel injector issue
- Compression loss on one cylinder
- Engine mount masking vibration symptoms
Diagnostic steps
- Read misfire counters per cylinder
- Inspect spark plugs and ignition coils
- Test fuel injector balance
- Perform compression test
- Check engine mounts
Repair notes
Replace worn spark plugs and ignition coils; investigate further if misfires persist.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1