The P1390 code on Dodge vehicles (Ram, Charger, Challenger, Durango, etc.) indicates a critical misalignment between the crankshaft (CKP) and camshaft (CMP), compromising ignition and injection control. Without intervention, this fault can cause irreversible engine damage.
🚨 Immediate Symptoms
- Engine fails to start or suddenly stalls.
- Severe misfires and power loss under load.
- Flashing “Check Engine” light + related codes (P0016, P0340).
- Grinding/Clicking noises near the timing cover (loose chain).
🔧 Dodge-Specific Causes
- Stretched timing chain (common on Hemi V8 > 100,000 km).
- Hydraulic tensioner failure (internal leak or blockage).
- Faulty CKP/CMP magnet (cracked or demagnetized).
- Damaged reluctor wheel (missing teeth or corrosion).
- Low oil pressure (worn pump, clogged filter, old oil).
🔍 Step-by-Step Diagnosis
- Check oil pressure:
- Minimum required: 10 psi at idle, 35+ psi at 2,000 RPM (Use Mopar 4902081AA gauge).
- Inspect timing chain:
- Access via side cover (models: Ram 1500 5.7L Hemi, Charger R/T).
- Check for stretch (misaligned marks > 6°) and guide condition.
- Test sensors:
- CKP: Resistance 800–1300 Ω (typical Hemi 5.7L value).
- CMP: AC 0.5–5V signal on oscilloscope.
- Advanced Mopar scanning:
- Use WiTECH or DRB III to analyze CKP/CMP misalignment (> 3° = fault).
🛠️ Recommended Repairs (With Mopar References)
| Faulty Component | Solution | Recommended Dodge Parts |
|---|---|---|
| Timing chain | Replace full kit (chain + tensioners + guides) | Mopar 68164189AA (Hemi 5.7L) |
| CKP Magnet | Replace (air gap: 0.5–1.5 mm) | Mopar 56027866AB (Ram 1500) |
| CMP Magnet | Clean or replace | Mopar 4894022AB (Charger 3.6L) |
| Reluctor wheel | Inspect crankshaft rotor (replace if scratched/missing teeth) | Mopar 4668272AB |
⚠️ Critical Warning:
Hemi and Pentastar engines are interference engines! Desynchronization causes piston-valve collision. Stop the engine immediately if abnormal noises occur!
💡 Key Post-Repair Procedures
- Timing alignment:
- Specific Mopar tools: Crankshaft lock 10238 + Camshaft lock 10243.
- ECU reset:
- Clear codes via WiTECH + perform sensor relearn.
- Oil control:
- Use 5W-20/5W-40 Full Synthetic (MS-6395 standard) + Mopar filter 5281090AB.
📊 Technical Sheet
| Parameter | Value |
|---|---|
| OBD2 Code | P1390 |
| Definition | “Crankshaft/Camshaft Correlation Error” |
| Sensitive Models | Ram 1500, Durango, Charger, Challenger (2005–2020) |
| Urgency | MAXIMUM (engine failure risk) |
Comparison of Recurring Issues by Model
| Model | Common Failure | Solution |
|---|---|---|
| Ram 1500 5.7L Hemi | Leaking hydraulic tensioner | Mopar chain kit 68164189AA |
| Charger 3.6L V6 | CMP magnet flooded with oil | Replace Mopar 4894022AB |
| Durango 4.7L V8 | Oxidized reluctor wheel (moisture) | Change rotor Mopar 4668272AB |
Conclusion
The P1390 code on Dodge indicates a highly critical timing fault. The primary causes are:
- Timing chain wear (especially on Hemi V8),
- CKP/CMP magnet failure (sensitive to oil leaks),
- Insufficient oil pressure.
Recommended Actions:
- Urgently check oil pressure and chain play.
- Replace faulty components with Mopar parts to ensure compatibility.
- Perform precise timing alignment with dedicated tools and reset the ECU via WiTECH.
Do not start the engine again – have the vehicle towed to a certified Mopar technician. Ignoring this code can lead to engine destruction (cost: $5,000+).