🚨 Diagnostic Profile
Vehicle Make: Chrysler
Vehicle Model/Year: Model/year not specified — confirm exact platform and engine via VIN decode before applying circuit-specific values from service information.
Short Description: Electronic Ignition System Fault Line. The electronic ignition system is reporting a fault condition that may cause misfire, hard starting, no-start, or rough running.
🚨 Repair Difficulty Tier
Tier: [Intermediate]
This repair requires a working knowledge of electrical circuit testing, a scan tool capable of reading live ignition data (factory-level Chrysler wiTECH or an equivalent enhanced-OBD scan tool is strongly recommended for coil command tests and PCM variation-learn routines), and access to model-specific service information. Most faults in this system are resolved by testing and replacing individual components, but intermittent wiring faults at the Power Distribution Center (PDC) or harness connectors can require extended diagnosis.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
- Verify battery state of charge (should read approximately 12.4–12.6V at rest) and confirm charging system output is within the normal alternator charging range of approximately 13.5–14.7V with the engine running.
- Scan all modules for stored and pending diagnostic trouble codes and record freeze frame data before disconnecting the battery or clearing any codes.
- Visually inspect ignition coil connectors, crankshaft and camshaft position sensor connectors, and the main ignition harness for corrosion, pushed-out pins, or heat damage.
- Inspect spark plugs, plug wires or boots, and coil-on-plug seals for wear, cracking, oil contamination, or carbon tracking.
- Check the engine ground straps and battery cable connections for looseness, corrosion, or excessive resistance.
- Confirm the correct fuse and relay for the ignition/PCM circuit are seated and undamaged. On most Chrysler platforms, these are located in the underhood Power Distribution Center (PDC) or Totally Integrated Power Module (TIPM) — verify exact fuse/relay callouts using the label on the underside of the PDC/TIPM cover or the model-specific service manual.
Step 2: Diagnostic Verification
- Use a scan tool with bi-directional control to command each ignition coil individually and confirm a corresponding change on the live data stream or an audible coil click.
- Monitor crankshaft and camshaft position sensor signal patterns during cranking on a scan tool or lab scope and compare the waveform/pattern against the known-good pattern or specification listed in service information.
- Perform a voltage drop test on the ignition supply and ground circuits while the engine is cranking; a healthy circuit should show minimal voltage drop (industry-standard target is generally under 0.5V on any individual ground or supply leg — confirm against OEM spec for this exact application).
- Check continuity and resistance on the suspect circuit using the factory wiring diagram for this specific model and engine combination; identify circuits by their documented function (e.g., ignition coil driver circuit, 5-volt sensor reference circuit, sensor ground circuit) rather than assuming pin numbers without confirming them in service information.
- Test each ignition coil’s primary and secondary resistance with an ohmmeter and compare to the OEM specification for that exact coil part number (coil-on-plug units on Chrysler engines commonly fall in the range of roughly 0.3–2 ohms primary and 5,000–15,000 ohms secondary, but the exact figure must be confirmed against the specific coil’s published spec).
- Check the 5-volt reference and sensor ground circuits for the crank/cam sensors using a digital multimeter against a known-good ground to rule out a shared reference circuit fault affecting multiple sensors.
- Isolate the fault to a single component, connector, or circuit segment before replacing any parts.
Step 3: Resolution & Reset Process
- Repair or replace the faulty component or wiring section using OEM or OEM-equivalent parts matched to the exact engine and model application.
- Replace spark plugs and wires or boots if they were found worn, gapping or installing new plugs to the torque and gap specification listed for this exact engine.
- Clear all diagnostic trouble codes with the scan tool once repairs are complete.
- Perform any required relearn or initialization procedures listed in service information for this model — on many Chrysler V6/V8 applications this includes a Crankshaft Position Sensor Variation Learn procedure following PCM, crank sensor, or flexplate/flywheel-related work, performed with a factory-level or capable aftermarket scan tool.
- Road test the vehicle under the conditions that originally produced the fault (cold start, idle, load, highway cruise as applicable) and confirm no codes return.
- Recheck live data (coil command response, crank/cam correlation, fuel trims) and document final readings for the repair record.
📦 Parts, Labor, and Budget Estimates
Required Components/Software:
- Ignition coil(s), crankshaft position sensor, or camshaft position sensor as isolated by diagnosis — exact part number must be pulled from VIN-specific parts lookup
- Spark plugs and plug wires or boots, if required — exact part number must be pulled from VIN-specific parts lookup
- Scan tool with bi-directional ignition control and live data capability (factory wiTECH preferred, or a capable enhanced-OBD aftermarket tool such as Autel, Snap-on, or Launch)
- Current service information subscription for this model (e.g., Chrysler/Mopar TechAuthority or an equivalent third-party service data platform)
Average Component Price:
- Ignition coil (each): approximately $35–$120 depending on engine family and OEM vs. aftermarket
- Crankshaft or camshaft position sensor: approximately $30–$100
- Spark plugs (full set) and boots/wires if equipped: approximately $40–$150
- Connector/harness repair pigtail (if needed): approximately $20–$75
- Total parts estimate: approximately $100–$400 depending on which components are found faulty
Estimated Labor Hours:
- Diagnosis and verification: approximately 0.5–1.5 hours
- Component replacement (coil, sensor, plugs, or minor harness repair): approximately 0.5–1.5 hours depending on component accessibility
- Reset, variation-learn/relearn procedure, and road test: approximately 0.3–0.5 hours
- Total labor estimate: approximately 1.3–3.5 hours at the shop’s posted labor rate (commonly $120–$180/hour depending on region and facility type)
Total estimated out-the-door cost range: approximately $250–$900, varying significantly based on which component(s) are confirmed faulty, whether a PCM reprogram/relearn is required, and local labor rates.