Understanding OBD-II Codes P1336–P1346: Engine Misfire & Timing Faults

Modern vehicles rely heavily on precise timing between the crankshaft and camshaft—when this synchronization fails, diagnostic trouble codes (DTCs) like P1336 to P1346 appear, signaling misfires, timing issues, or sensor malfunctions. These codes are critical for diagnosing engine performance problems—and having the right tool, like the iCarsoft CR MAX, makes resolving them efficient and accurate.

What Are P1336 and P1346 Fault Codes?

P1336–P1346 are manufacturer-specific or semi-generic OBD-II codes (varies by brand) tied to the crankshaft position sensor (CKP) and engine timing systems. While exact definitions differ slightly by vehicle, P1336 and P1346 are the most common—and critical—codes in this range:

Key note: P1337–P1345 (the middle of this code range) typically extend these issues—e.g., P1338 for "Crankshaft Position Sensor Intermittent," P1340 for "CKP-Camshaft Position Sensor (CMP) Correlation Fault." All share roots in timing or sensor function.

Symptoms of P1336–P1346 Codes

These codes disrupt engine timing and performance—symptoms are hard to ignore and often worsen over time:

Common Causes of P1336–P1346 Codes

These codes stem from issues that disrupt crankshaft timing or CKP sensor function. Below are the most frequent culprits, based on technician feedback and industry data:

How to Diagnose & Fix P1336–P1346 Codes (with iCarsoft CR MAX)

Resolving these codes requires a systematic approach—start with diagnosis, then target repairs. The iCarsoft CR MAX streamlines every step, from code reading to gear relearn.

Step 1: Diagnose the Root Cause

1. Scan for Codes & Freeze-Frame Data
   • Connect the CR MAX to your vehicle’s OBD-II port, power it on, and use AutoVIN Recognition to identify your make/model (saves time vs. manual selection).
   • Navigate to Engine Control Module > Fault Codes > Read Codes to confirm P1336/P1346 and check for related codes (e.g., P0011 for VVT issues, P0335 for CKP sensor failure).
   • Review freeze-frame data to see when the code triggered (e.g., "Cold Start," "Highway Speed")—this narrows down causes (e.g., cold oil = VVT solenoid clog).
2. Visual Inspection
   • Locate the CKP sensor (use CR MAX’s Component Location feature—typically near the crankshaft pulley or transmission bell housing) and VVT solenoid (on the cylinder head).
   • Inspect for:
     • Oil leaks (can damage the CKP sensor).
     • Corroded/loose connectors (spray with electrical contact cleaner if needed).
     • Frayed wiring (check harness for rodent damage or contact with hot surfaces).
     • Timing chain/belt slack (remove the timing cover if accessible—look for cracks or stretched links).
3. Monitor Live Data with CR MAX
   • Start the engine (if possible) and navigate to Engine > Live Data > Timing & Sensor Data to track:
     • CKP Sensor Signal: Should show a steady, consistent waveform (no dropouts). Intermittent signals point to wiring/sensor faults (P1346).
     • VVT Solenoid Position: Should adjust smoothly as RPMs increase. Stuck readings mean a faulty solenoid (P1336).
     • Engine Oil Pressure: Low pressure (<20 PSI at idle) confirms oil-related issues (add oil or replace the oil pump).

Step 2: Targeted Repairs

1. Fix Oil-Related Issues
   • Check oil level—add oil if low (use OEM-recommended viscosity).
   • Replace old/contaminated oil and oil filter (critical for VVT system function). Add a fuel system cleaner to remove sludge.
2. Replace Faulty Components
   • CKP Sensor: If live data shows no signal, replace the sensor with an OEM part. Torque to specs (8–12 ft-lbs) to avoid damage.
   • VVT Solenoid: Remove and clean the solenoid with brake cleaner (unclogs sludge). If cleaning fails, replace it (match OEM part number).
   • Timing Chain/Belt: For stretched/worn chains/belts, consult a professional—this requires specialized tools to realign timing marks.
3. Repair Wiring/Circuits
   • Use the CR MAX’s Multimeter to test CKP sensor wiring:
     • Check for continuity (no breaks) between sensor and ECU.
     • Test reference voltage (typically 5V from ECU)—low voltage means a shorted wire.
   • Repair frayed wires with heat-shrink tubing; replace completely broken wires with matching-gauge wire.

Step 3: Perform Crankshaft Position Sensor Gear Relearn (for P1336)

The gear relearn procedure is mandatory for P1336—it resets the ECU’s timing data. The iCarsoft CR MAX provides guided steps to avoid mistakes:

1. Preconditions
   • Start the engine and let it idle until coolant temperature reaches 60°C (140°F) (monitor via CR MAX live data).
   • Turn off all electrical loads: A/C, lights, radio, heated seats.
   • Ensure the vehicle is in "Park" (automatic) or "Neutral" (manual), with the parking brake engaged.
2. Initiate Relearn with CR MAX
   • Navigate to Special Functions > Engine > Crankshaft Position Sensor Gear Learning (labeling varies by brand—e.g., "CKP Relearn" or "Target Gear Calibration").
   • Follow the CR MAX’s on-screen prompts—confirm preconditions are met before proceeding.
3. Execute the Procedure
   • When prompted, swiftly press the accelerator pedal to the floor and hold it wide open (do not release until instructed).
   • The ECU will adjust engine RPM, fluctuating between 1,300–4,500 RPM for 3–5 cycles (the CR MAX will display progress).
   • Do not turn off the engine or release the pedal during this process—interruption will require restarting.
4. Verify Success
   • When the CR MAX shows "Relearn Complete," release the accelerator and turn off the ignition for 10 seconds.
   • Restart the engine, use the CR MAX to Clear Codes, and test drive for 20–30 miles (include highway and city driving).
   • Re-scan—if P1336 does not return, the relearn was successful.

Why the iCarsoft CR MAX Is Your Ideal Tool for P1336–P1346

Can I Drive with P1336–P1346 Codes?

Preventing Future P1336–P1346 Codes

Avoid recurring timing and sensor issues with these proactive habits:

FAQ: Common Questions About P1336–P1346

Summary Table: P1336–P1346 Diagnosis & Repair Steps

Conclusion

OBD-II codes P1336–P1346 may seem complex, but they boil down to two core issues: missing timing data (P1336) or sensor/circuit faults (P1346). With the right approach—diagnose first, repair targeted components, and perform a relearn (when needed)—you can resolve these codes without expensive dealer visits.

The iCarsoft CR MAX is the key to success: its guided relearn procedure fixes P1336, live data waveforms diagnose P1346, and component location tools save hours of troubleshooting. Whether you’re a DIY enthusiast or professional mechanic, the CR MAX turns confusing timing faults into manageable repairs.

Don’t let P1336–P1346 damage your engine or drain your wallet. Equip yourself with the CR MAX and this guide, and you’ll tackle timing and sensor issues with confidence—keeping your vehicle running smoothly for years to come.