Misfire Adaptive Numerator At Limit
2004-2004 Dodge Dakota 4.7L V8
The 2004 Dodge Dakota is equipped with a 4.7L V8 engine. Below you'll find detailed p1398 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The PCM misfire adaptive learning has reached its maximum correction limit. The system can no longer compensate for the detected misfire condition, indicating a persistent misfire problem that exceeds the adaptive range.
Symptoms
- Check Engine Light
- Noticeable engine misfire
- Rough idle
- Poor acceleration
- Failed emissions test
Common Causes
- Worn spark plugs or ignition coils
- Fuel injector malfunction
- Low compression in one or more cylinders
- Vacuum leak at specific cylinder
- Crankshaft position sensor signal issue
Diagnostic Steps
- Check for companion misfire codes (P0300-P0312) to identify affected cylinders
- Inspect spark plugs and ignition coils
- Perform fuel injector balance test
- Run compression test on suspected cylinders
- Check for vacuum leaks
Repair Notes
Identify and repair the root cause misfire using companion codes; this code will clear once the misfire is resolved.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1398 on Other Vehicles
Common Questions
What does code P1398 mean on a 2004-2004 Dodge Dakota?
P1398 stands for "Misfire Adaptive Numerator At Limit". The PCM misfire adaptive learning has reached its maximum correction limit. The system can no longer compensate for the detected misfire condition, indicating a persistent misfire problem that exceeds the adaptive range.
What are the symptoms of P1398 on a Dodge Dakota?
Common symptoms of P1398 include: Check Engine Light, Noticeable engine misfire, Rough idle, Poor acceleration, Failed emissions test.
What causes P1398 on a 2004-2004 Dodge Dakota?
Common causes of P1398 include: Worn spark plugs or ignition coils, Fuel injector malfunction, Low compression in one or more cylinders, Vacuum leak at specific cylinder, Crankshaft position sensor signal issue.
Last updated: March 2026