🚨 Diagnostic Profile
Vehicle Make: Chrysler
Fault Description: 24X Reference Circuit Low Frequency. This condition indicates the powertrain control module is receiving a crankshaft position reference signal from the 24-tooth (24X) wheel that is below the expected frequency or is missing pulses. Common related DTCs include P0336 (Crankshaft Position Sensor A Circuit Range/Performance) and P0337 (Crankshaft Position Sensor A Circuit Low Input). Confirm the exact code set on this vehicle before proceeding.
🚨 Repair Difficulty Tier
Tier: [Intermediate]
Diagnosis requires scan tool data review, waveform or signal testing, and basic electrical circuit checks. Sensor replacement is typically straightforward, but confirming the root cause (sensor, wiring, reluctor wheel, or timing components) requires methodical testing.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
- Verify battery state of charge (minimum 12.4V key-off, engine cranking voltage should not drop below 9.6V) and check for related DTCs stored in the PCM and any linked modules.
- Record freeze frame data, RPM at time of fault, and any stall, hard-start, or intermittent no-start history reported by the customer.
- Visually inspect the crankshaft position sensor connector for corrosion, pushed-in or spread terminals, or moisture intrusion. On most Chrysler/Mopar engine families, the 24X crank sensor is mounted on the engine block near the bellhousing or front cover, close to the crankshaft reluctor wheel/flexplate-side or pulley-side depending on engine design — confirm exact mounting location using service information specific to the engine platform installed in this vehicle.
- Inspect the sensor harness for chafing, heat damage, or pinched routing. The harness typically runs along the engine block or bellhousing, secured by retaining clips, and may be routed near the starter, oil pan rail, or exhaust manifold — areas prone to heat-related insulation breakdown.
- Inspect the crankshaft reluctor (24X wheel) for missing, bent, or damaged teeth, and check for debris, oil contamination, or metal shavings on the sensor tip.
- Check the sensor mounting bolt for proper torque and confirm the sensor is fully seated against its mounting boss with no air gap variance from factory spec.
Step 2: Diagnostic Verification
- Command live data and monitor the crankshaft position sensor RPM signal and sync status while cranking and at idle; compare against the camshaft position sensor signal to check for correlation faults.
- Perform a signal test using a lab scope or multimeter per service information. Most Chrysler 24X crank sensors are 3-wire Hall-effect type, producing a digital square-wave signal switching between 0V and sensor reference voltage (typically 5V) as the reluctor wheel passes the sensor tip.
- Check sensor power and ground circuits for voltage drop and continuity. Reference (power) circuit should read close to system reference voltage (typically 5V) with the key on, and ground circuit should show minimal resistance (near 0 ohms) back to chassis/engine ground.
- If a 2-wire variable reluctance sensor is installed on the specific engine, measure coil resistance and compare to the OEM specification for that engine family (variable reluctance crank sensors commonly fall in the 200–900 ohm range, but exact spec must be confirmed in service information for the platform in question).
- Check for intermittent faults by lightly flexing and wiggling the harness and connector while monitoring live signal data and scope waveform for dropouts or voltage spikes.
- Inspect timing components for mechanical issues that could affect reference signal alignment, such as timing chain stretch, timing belt wear, or reluctor wheel slippage, if signal faults persist after electrical testing is clear.
Step 3: Resolution & Reset Process
- Repair or replace the faulty component identified during testing (sensor, harness section, connector, or reluctor wheel).
- Clean the sensor mounting surface and bore of debris or old sealant residue, then install the sensor using the torque specification listed in the OEM service manual for the specific engine family (small sensor retaining bolts on this sensor type commonly torque in the 40–105 in-lbs / 4.5–12 Nm range — always confirm the exact factory value before final installation).
- Reconnect all connectors and confirm they are fully seated and locked, with terminals free of corrosion.
- Clear all stored and pending DTCs using a capable scan tool and perform any PCM crank sensor relearn or variation learn procedure required by the service information for the specific engine and model year.
- Start and idle the engine through a complete warm-up cycle, then perform a road test covering varied RPM and load conditions to confirm stable operation.
- Recheck live data to confirm the 24X reference signal frequency is stable, correlates properly with camshaft sync, and that no pending or recurring DTCs have returned.
📦 Parts, Labor, and Budget Estimates
Required Components/Software:
- Crankshaft position sensor — exact OEM/Mopar part number must be confirmed via VIN-specific parts lookup for the specific engine and model year
- Connector pigtail or harness repair kit (if corrosion or chafe damage is found) — sourced via OEM parts catalog or quality aftermarket harness repair supplier
- Reluctor wheel, timing chain/belt components (only if mechanical damage is confirmed) — OEM part number dependent on engine family
- Chrysler-capable scan tool with enhanced PCM data stream access and bi-directional relearn capability (OEM-level tool such as Mopar wiTECH, or a comparable professional-grade aftermarket scan tool with OEM function coverage)
- Digital multimeter with min/max and frequency capture, and/or a lab scope capable of capturing digital square-wave or AC sine-wave crank signal patterns
Average Component Price:
- Crankshaft position sensor: approximately $35–$120 (OEM Mopar sensors typically run higher than quality aftermarket equivalents)
- Harness or connector repair parts (pigtail, terminals, loom): approximately $20–$90 depending on repair scope
- Reluctor wheel or timing component replacement (if required): approximately $150–$600+ in parts alone, highly dependent on engine family and whether the reluctor is integrated into the crank sprocket, flexplate, or flywheel
Estimated Labor Hours:
- Diagnosis and verification (scan data review, circuit/signal testing): 0.5–1.5 hours
- Sensor replacement only (straightforward access): 0.3–0.8 hours
- Sensor replacement (restricted access, e.g., behind accessory brackets or requiring component removal): 1.0–2.5 hours
- Harness repair or timing component replacement (if required): 1.5–5.0+ hours depending on whether timing cover removal or timing chain/belt service is necessary
- PCM relearn/variant learn, reset, and road test confirmation: 0.3–0.6 hours