Dodge P1398: Misfire Adaptive Numerator At Limit
Is your scanner showing Dodge P1398?
No worries. We'll show you what it means and how to deal with it.
Dodge P1398: Misfire Adaptive Numerator At LimitOVERVIEW
What Does The Dodge P1398 Code Mean?
Engine started; ECT Sensor under 75ºF; engine runtime over 50 sec. ; A/C “OFF”; vehicle speed over 36 mph in 1st gear, or over 65 mph in high gear, followed by a closed throttle decel period. This code sets if the PCM detects one of the CKP Sensor target windows varies more than 2.86% from the reference window. Background – PCM needs to learn any variation in engine machining to detect when a misfire is present. CKP Sensor has 2 40 windows that are 180 apart. The window for Cylinders 1 and 4 is the reference window. It is checked against the window for Cylinders 2 and 3. The PCM checks for any variation to make engine speed adjustments.
What Are The Potential Causes Of The Dodge P1398 Code?
- Base engine problem (i. e. , low cylinder compression)
- CKP Sensor crankshaft target variation too large
- CKP Sensor improperly installed or the CKP Sensor has failed
- CKP Sensor signal circuit open or shorted (intermittent fault)
- Tone wheel or pulse ring is damaged
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Dodge P1398, DTCDECODE.