What is the code P0336 for crankshaft position sensor?
The Crankshaft Position Sensor A Circuit Range/Performance fault code P0336 indicates the primary crankshaft sensor’s signal or circuit is operating outside expected parameters. This can affect starting and running, depending on the vehicle.
The code points to the Crankshaft Position Sensor A circuit, which provides the engine control module (ECM) with timing information used to control ignition and fuel injection. A faulty sensor, wiring issues, a damaged reluctor ring, or timing concerns can trigger P0336 in many vehicles. Diagnosis often involves checking live data, wiring integrity, and mechanical timing alignment.
What P0336 means in practice
The P0336 trouble code signifies a range or performance issue with Crankshaft Position Sensor A, most commonly tied to Bank 1 on many engines. While some brands label the bank differently, the core issue is that the PCM is not receiving a clean, consistent signal from the primary crank sensor.
Vehicle-specific variations
Different makes and models may describe the sensor location and bank designation slightly differently. Always consult your vehicle’s service manual or a manufacturer bulletin for exact wording and diagnostic steps for your model.
Symptoms
Common signs that may accompany P0336, though they can overlap with other issues, include:
- Engine misfires or rough running, especially at idle or under load
- Engine stalling or failure to start
- Check Engine Light (CEL) or service indicator illuminated
- Difficulty starting or intermittent no-start conditions
- Erratic RPM readings or loss of tachometer signal
Symptom severity varies by vehicle and may coincide with other sensor problems.
Causes
Several faults can trigger P0336. The most common causes include:
- Faulty crankshaft position sensor (sensor A)
- Damaged, corroded, or loose wiring/connectors to the sensor
- Damaged reluctor ring or tone wheel, or improper air gap
- Engine timing issues (timing belt/chain wear or misalignment)
- ECM/PCM fault or software issue
- Poor grounding or power supply to the sensor circuit
Note that P0336 is distinct from related codes like P0335 (sensor A circuit malfunction) and P0339 (Crankshaft Position Sensor A Circuit Intermittent). Diagnostic steps may differ accordingly.
Diagnosis
Diagnosing P0336 involves both electrical checks and mechanical inspection to identify the root cause:
- Use an OBD-II scanner to confirm P0336 and scan for related codes (e.g., P0335, P0339).
- Inspect the sensor and wiring for damage, corrosion, or loose connectors.
- Check live data for Crankshaft Position Sensor A; compare signal waveform against RPM and timing events for anomalies.
- Test sensor circuit resistance and continuity per the vehicle’s service procedures.
- Inspect the reluctor ring or tone wheel for damage or debris and verify proper clearance to the sensor.
- Verify engine timing (timing belt/chain) if applicable and correct any misalignment.
- Check for manufacturer service bulletins or ECM software updates addressing P0336.
Intermittent signals or multiple related codes may require deeper diagnostics or professional assistance.
Common fixes
Actual repairs depend on the identified fault:
- Replace the crankshaft position sensor (sensor A) if it’s faulty
- Repair or replace damaged wiring or connectors to the sensor
- Repair or replace a damaged reluctor ring; ensure proper clearance with the sensor
- Correct timing issues if the timing chain/belt is misaligned or worn
- Update or reprogram the ECM/PCM if a software fault is implicated
- Address grounding or power supply problems to the sensor circuit
After repairs, clear codes and perform a test drive to confirm the fault does not return and the sensor signal remains stable.
What to expect after repair
With the underlying issue resolved, most vehicles should return to normal operation, the check engine light should turn off after a successful drive cycle, and starting and running should be reliable. If the code recurs, further diagnostics are necessary to identify secondary issues or sensor failures.
Summary
P0336 stands for Crankshaft Position Sensor A Circuit Range/Performance. It signals that the primary crankshaft sensor’s signal or circuit is out of specification, often due to a faulty sensor, wiring problems, reluctor ring damage, or timing issues. Diagnosis combines electrical tests, live data evaluation, and mechanical checks, with fixes typically involving sensor replacement, wiring repair, timing correction, or ECM updates. Most cases resolve with proper repair and testing.
