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P1398: PCM Is Unable To Learn The Crankshaft Position Sensor's Signal

DODGE JEEP PLYMOUTH PONTIAC BUICK CADILLAC CHEVY CHRYSLER
Severity
Medium
System
Manufacturer-Specific Powertrain
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P1398 Mean?

P1398 is a manufacturer-specific diagnostic trouble code: PCM Is Unable To Learn The Crankshaft Position Sensor's Signal. This code applies to DODGE, JEEP, PLYMOUTH, PONTIAC, BUICK vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1398

Common Causes

Frequently Asked Questions

What does P1398 mean?
P1398 indicates: PCM Is Unable To Learn The Crankshaft Position Sensor's Signal. The vehicle's computer has detected that the PCM Is Unable To Learn The Crankshaft Position Sensor's is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P1398?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1398 for extended periods may cause additional problems.
How much does it cost to fix P1398?
Repair costs for P1398 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect PCM Is Unable To Learn The Crankshaft Position Sensor's and related wiring
  • 🔧 Replace faulty PCM Is Unable To Learn The Crankshaft Position Sensor's
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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