Weak or failing crankshaft position sensor; Wiring damage or poor connection at the crank sensor connector; Reluctor ring (tone wheel) damage, missing teeth, or excessive runout; Low battery voltage or slow cranking speed during start; Starter motor drawing excessive current or failing to spin the engine fast enough; Mechanical timing issues such as a stretched timing chain or incorrect belt alignment; PCM internal fault or corrupted calibration (rare)

DTC codes / Chrysler codes / P1324

P1324 · ChryslerCrank RPM Too Low

Q: What does code P1324 mean?

Crank RPM Too Low. P1324 on a Chrysler vehicle means the powertrain control module (PCM) has detected that the crankshaft position sensor signal indicates engine speed is lower than the minimum expected threshold for the current operating conditions. This typically occurs during cranking or at idle when the PCM compares the actual crank RPM to a calibrated minimum and finds it too low, often pointing to a mechanical or sensor-related issue rather than a simple sensor failure.

P1324 on a Chrysler vehicle means the powertrain control module (PCM) has detected that the crankshaft position sensor signal indicates engine speed is lower than the minimum expected threshold for the current operating conditions. This typically occurs during cranking or at idle when the PCM compares the actual crank RPM to a calibrated minimum and finds it too low, often pointing to a mechanical or sensor-related issue rather than a simple sensor failure.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Engine cranks but fails to start or starts with extended cranking
Rough idle or stalling shortly after startup
Illuminated check engine light with no other noticeable driveability issues
Tachometer may read zero or fluctuate erratically while cranking
Intermittent no-start condition that may be temperature or moisture dependent
Often no symptoms besides the warning light if the fault is intermittent

Common causes, most likely first

Weak or failing crankshaft position sensor
Wiring damage or poor connection at the crank sensor connector
Reluctor ring (tone wheel) damage, missing teeth, or excessive runout
Low battery voltage or slow cranking speed during start
Starter motor drawing excessive current or failing to spin the engine fast enough
Mechanical timing issues such as a stretched timing chain or incorrect belt alignment
PCM internal fault or corrupted calibration (rare)

How to diagnose and fix it

Perform a battery load test and check charging system output to rule out low cranking voltage
Inspect the crankshaft position sensor connector and wiring for corrosion, chafing, or loose pins
Use a scan tool to monitor crank RPM while cranking and compare to specification
Check the reluctor ring for damaged or missing teeth through the sensor mounting hole
Measure starter current draw and cranking speed to identify a slow starter
Replace the crankshaft position sensor if signal is erratic or absent
Verify engine mechanical timing and inspect the timing chain or belt for wear

Crank RPM Too Low Is Not Always a Sensor

A weak battery or failing starter can cause P1324 without any sensor fault, because the PCM sees cranking speed below the minimum threshold and sets the code.
The reluctor ring on the crankshaft is a common culprit on high-mileage Chrysler engines, and a single missing tooth can produce a low RPM signal that mimics a bad sensor.
Intermittent P1324 that appears only in damp weather often traces to a chafed crank sensor harness near the exhaust manifold or accessory belt.
Do not replace the PCM until you have verified the crank signal with an oscilloscope, because a clean waveform at the PCM connector rules out the sensor and wiring.
A stretched timing chain can retard cam timing enough to lower calculated crank RPM at idle, setting P1324 alongside cam correlation codes.

Can I keep driving with P1324?

If the engine starts and runs normally, you can drive cautiously to a repair shop, but avoid prolonged cranking or repeated start attempts that could overheat the starter. If the engine stalls or fails to restart, stop driving and have the vehicle towed to prevent a no-start situation in traffic.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.