OBD2 Code P0335: Crankshaft Position Sensor A Circuit Malfunction — CKP sensor signal lost per SAE J1939-71 engine speed parameter
The P0335 code means Crankshaft Position Sensor A Circuit Malfunction — CKP sensor signal lost per SAE J1939-71 engine speed parameter. Estimated repair cost: $100 – $600.
📋 Diagnostic Reference
| OBD2 Code | P0335 |
| Category | Powertrain |
| Severity | Check Soon |
| Repair Cost | $100 – $600 |
| Can You Drive? | ⛔ NO — tow the vehicle |
🔍 Symptoms
- Check Engine Light on
- hard starting or extended crank time
- engine may not start at all
- engine dies while driving
- tachometer reads zero or erratic
- no spark during crank
⚠️ Most Likely Causes (in order of probability)
- Failed crankshaft position sensor — most common on vehicles with 80,000+ miles
- Damaged CKP sensor wiring — heat from exhaust melts nearby wires
- Cracked or damaged crankshaft tone ring — metal debris on sensor tip
- Loose CKP sensor connector — intermittent signal loss
- CKP sensor air gap too wide — sensor mounted too far from tone ring
- Failed ECM/PCM CKP input circuit — internal driver failure
- Timing chain/belt jumped teeth — CKP and CMP signals disagree
🛠️ Diagnostic Procedure
Step 1: Check CKP sensor resistance: Hall-effect sensors typically 500-1500 ohms, induct...
Check CKP sensor resistance: Hall-effect sensors typically 500-1500 ohms, inductive sensors 300-800 ohms at 20°C per manufacturer specifications
Step 2: Inspect CKP sensor wiring near exhaust manifold for heat damage — most common fa...
Inspect CKP sensor wiring near exhaust manifold for heat damage — most common failure point
Step 3: Check CKP sensor connector for corrosion or loose pins
Check CKP sensor connector for corrosion or loose pins
Step 4: Measure CKP sensor air gap: typically 0.030-0.050 inch for inductive, 0.020-0.03...
Measure CKP sensor air gap: typically 0.030-0.050 inch for inductive, 0.020-0.030 inch for Hall-effect
Step 5: Oscilloscope test CKP signal: should show clean square wave or AC sine wave patt...
Oscilloscope test CKP signal: should show clean square wave or AC sine wave pattern during crank
Step 6: Inspect crankshaft tone ring through sensor hole: check for cracked or missing t...
Inspect crankshaft tone ring through sensor hole: check for cracked or missing teeth
Step 7: Compare CKP and CMP signals: if phase mismatch, timing chain/belt may have jumpe...
Compare CKP and CMP signals: if phase mismatch, timing chain/belt may have jumped
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