P0336 Code: Subaru Impreza (2017-2023) - Causes, Symptoms & Fixes

REAL NHTSA DATA FOR Subaru Impreza (2017-2023)

• OWNER COMPLAINTS: No NHTSA complaints found for this make/model/year/issue combination.
• OFFICIAL RECALLS: No recalls found in NHTSA database.

Note on data: The above data indicate no documented owner complaints or recalls in the NHTSA database for P0336 on 2017-2023 Subaru Impreza. This guide uses general automotive knowledge for how P0336 behaves and how it’s typically diagnosed and repaired on Subaru 2.0L engines of this era. Data limitations mean you should treat any automotive symptom as potentially caused by multiple factors; always verify with current vehicle diagnostics.

1. CODE MEANING AND SEVERITY

• Code: P0336
• Description: Crankshaft Position Sensor A – Range/Performance
• What it signals: The crankshaft position sensor (CKP) is providing a signal that is out of spec, erratic, or outside expected range. The PCM is receiving a crank signal that it considers unreliable for proper engine timing.
• Severity/impact:
  • If the CKP signal is completely absent or severely erratic, the engine may not start or may stall intermittently.
  • If the signal is intermittently out of range, you can see symptoms such as rough idle, misfires, reduced power, or stalling while driving.
  • The engine may default to a limp mode in some scenarios to prevent damage, but draw can vary by model and engine management strategy.
• Important: P0336 often coexists with other codes (for example, P0335 for “CKP A Circuit Malfunction”) or misfire codes if the PCM detects mis-timing. Always check for additional codes and live data.

2. COMMON CAUSES ON SUBARU IMPREZA

• Faulty crankshaft position sensor itself
• Damaged or loose wiring harness between CKP sensor and PCM (chafed insulation, cracking, moisture intrusion)
• Corrosion or damaged sensor connector pins (poor connection)
• Oil leaks or contamination around the sensor or reluctor ring, causing signal degradation
• Reluctor wheel/reluctor ring damage or misalignment on the crankshaft
• Timing chain/belt or cam timing issues (less common for CKP range/performance codes, but can affect timing signals and trigger accuracy)
• Mechanical engine issues that alter crankshaft speed or vibration patterns, leading to abnormal CKP readings
• aftermarket alterations or improper reassembly after maintenance (sensor positioning or wiring routing)

3. SYMPTOMS

• Engine may fail to start or crank but not start
• Intermittent stalling or stuttering, especially at idle or under load
• Misfires indicated by P0300-series codes or rough running
• Check Engine Light (CEL) illuminated
• Reduced power or limp-mode behavior in some driving conditions
• In some cases, no obvious symptoms aside from the MIL (malfunction indicator lamp)

4. DIAGNOSTIC STEPS
   Important: Work safely. Disconnect the battery before disconnecting or reconnecting sensors, and follow key-on/engine-off procedures per service manual when testing sensor circuits.

A. Confirm the code and context

• Use a professional-grade OBD-II scan tool to confirm P0336 and to read any related codes (P0335, P0330, P030X, etc.).
• Retrieve live data: watch the CKP sensor signal or engine RPM in real time during cranking and running. Look for a clean, repeatable waveform (if your tool supports it) or at least a stable RPM readout that correlates with crank activity.
• Check freeze-frame data forRPM, vehicle speed, and sensor-related values at the time the code was stored.

B. Visually inspect the CKP system

• Inspect the CKP sensor and its connector for damage, corrosion, or oil contamination.
• Inspect the harness leading to the sensor for abrasion, pin damage, or pin loosening.
• Look for oil leaks near the sensor or timing cover area that could contaminate the sensor or reluctor ring.
• Inspect the reluctor ring and crankshaft area for damage or obvious misalignment.

C. Electrical tests (CKP sensor circuit)

• Power and ground: With ignition ON (engine OFF), back-probe the CKP connector to verify:
  • A stable reference voltage (Vref) at the sensor circuit (typically around 5V in many systems).
  • A solid ground at the CKP ground circuit.
• Signal test:
  • With the engine cranking (or when applicable), monitor the CKP signal wire with a multimeter or oscilloscope. You should see a periodic signal that corresponds to crankshaft rotation. A missing signal, a signal that is spiky/noisy, or one that jumps erratically indicates a faulty sensor or wiring issue.
• Resistance test (if applicable): Some CKP sensors have a specified resistance range between signal and ground or between other pins. Compare measured values to the service data for your engine variant. If out of range, sensor or wiring is at fault.

D. Mechanical check if electrical tests are inconclusive

• If wiring and sensor tests pass but the issue persists, inspect the reluctor ring (on the crankshaft) for cracks, missing teeth, or misalignment.
• Check timing components if work has been performed recently (timing belt/chain, tensioners, guides). Severe mis-timing can produce symptoms that resemble CKP range issues.

E. Confirm no related codes

• Clear codes after any repair and perform a road test to confirm the issue is resolved and no new codes appear.

F. Decision point

• If the CKP sensor and wiring test good, but P0336 reappears, you may be dealing with a PCM issue or a less obvious mechanical concern. In such cases consult a Subaru dealer or a shop with advanced diagnostic capabilities (scope tracing at the PCM input, more in-depth wiring diagrams).

5. RELATED CODES

• P0335 Crankshaft Position Sensor A Circuit Malfunction
• P0337 Crankshaft Position Sensor A Circuit Range/Performance (or related variants depending on model year)
• P0330-P0334 (other crankshaft sensor-related codes in the same family may appear if wiring or timing issues contribute)
  Note: In practice, CKP-related codes can appear in tandem with misfire or sensor circuits; diagnosing often involves confirming sensor output and wiring integrity before attributing to PCM or timing problems.

6. REPAIR OPTIONS AND COSTS (2025 PRICES)
   Prices are approximate and can vary by region, shop, and whether OEM or aftermarket parts are used.

A. CKP sensor replacement

• Parts: OEM CKP sensor typically $60–$150. Aftermarket equivalents can be $25–$100.
• Labor: 0.5–2.0 hours depending on access and engine variant (subarus often sit behind timing covers or near the crank pulley; some labor involved in reaching the sensor).
• Estimated total: $120–$350 (parts + labor). DIY parts cost typically $25–$150 plus your time.

B. Wiring harness and connector repair

• If wiring or connectors are damaged, costs increase.
• Parts: connectors and repair wires may be $10–$60; heat shrink/and harness repair materials.
• Labor: 1.0–2.5 hours depending on access.
• Estimated total: $100–$400.

C. Reluctor ring or crank area mechanical concerns

• If the reluctor ring is damaged or misaligned, replacements can be significant.
• Parts: Reluctor ring or related crank components (varies by engine family).
• Labor: Higher due to access and possible timing cover work.
• Estimated total: $300–$900 or more, depending on extent of work and whether timing cover removal is required.

D. Timing chain/belt concerns (if discovered to be the root cause)

• Parts: timing belt/chain kit, tensioners, seals.
• Labor: High (engine/or timing cover access required).
• Estimated total: $800–$1,500+.

E. Miscellaneous

• If a PCM issue is suspected after thorough testing, replacement is rare and typically consult-based; many shops will reprogram or update once the root cause is addressed.

Notes:

• If the vehicle is under warranty or a Subaru service program covers CKP issues, costs may be different.
• These estimates reflect typical 2025 pricing and can vary by location and shop rate.

7. DIY VS PROFESSIONAL

• DIY feasibility:
  • Pros: Potential savings on parts; direct control over inspection steps; good for someone with electrical testing equipment (multimeter/oscilloscope) and service manual data.
  • Cons: Access in Subaru engines can be tight; proper diagnosis requires verifying signals with an oscilloscope or advanced diagnostic tools; risk of misdiagnosis or improper reassembly if you’re not experienced.
• Professional path:
  • Pros: Access to factory service data, proper toolsets (scope, qualified wiring diagrams), and a systematic diagnostic approach; less risk of missing a related fault.
  • Cons: Higher labor cost; turnaround time may vary.
• Recommendation: Start with a thorough inspection of the CKP sensor and wiring yourself if you have the tools; if you’re not seeing a clear electrical fault or you’re uncomfortable testing the CKP signal, seek a professional diagnosis. For modern Subarus, many independent shops with Subaru experience can efficiently diagnose CKP and related issues.

8. PREVENTION

• Regularly inspect for oil leaks around the front of the engine and timing area; fix leaks promptly to reduce contamination on CKP sensors.
• Keep electrical connectors clean and dry; use dielectric grease during reassembly to resist moisture and corrosion.
• Avoid rough handling of connectors during maintenance; ensure connectors are fully seated and latched.
• If you perform timing work or crank sensor replacement, follow manufacturer torque specs and alignment procedures precisely.
• Use quality, correct-spec replacement parts (prefer OEM or reputable aftermarket CKP sensors and wiring harnesses).
• Periodically scan with an OBD-II tool to catch misfire or timing-related codes early; address concerns before they escalate.

Closing notes

• No recalls found in NHTSA database for this issue on the stated model years.
• No complaints data is listed in the provided dataset for this exact issue, so the diagnostic guidance focuses on typical CKP range/performance symptoms and Subaru-specific considerations.