P0335 Code: Chevrolet Malibu (2017-2023) - Causes, Symptoms & Fixes

1. CODE MEANING AND SEVERITY

• Code meaning: P0335 stands for Crankshaft Position Sensor "A" Circuit Malfunction. This DTC indicates the PCM/ECU is not seeing a valid crankshaft position reference, or the signal it is receiving is out of spec.

• Relevance to 2017-2023 Chevrolet Malibu: The Malibu uses crankshaft position information to synchronize ignition timing and fuel injection. If the CKP A circuit is faulty or its signal is erratic, the engine may not start, run poorly, misfire, stall, or go into a limp/limited mode. In some cases the engine may start but run intermittently or stall unexpectedly.

• Severity: High. P0335 can lead to a no-start condition or sudden stalling, leaving you stranded. It can also cause rough idle, misfires, and reduced drivability. It’s often diagnostic of a wiring/sensor/ECU issue rather than a simple mechanical failure, and misdiagnosis can mask other problems.

2. COMMON CAUSES ON CHEVROLET MALIBU

• Faulty CKP sensor itself (aging sensor, internal short, or mechanical wear).
• Damaged, corroded, or loose CKP sensor electrical connector or wiring harness (chafed insulation, broken pins, poor grounds).
• Wiring harness issues between the CKP sensor and the PCM (continuity problems, short to ground, open circuit).
• Damaged or misaligned reluctor ring or sensor mounting (sensor wasn’t seated correctly, rotor/ring damage from timing belt work or interference).
• PCM/ECM fault or poor electrical connections inside the PCM (less common).
• Low or unstable battery voltage or poor power supply (can cause intermittent sensor readings or PCM misinterpretation).
• Mechanical interference or oil leaks causing contamination around the sensor or reluctor area (rare but plausible).

3. SYMPTOMS

• Engine cranks but does not start, or intermittently stalls after starting.
• Engine starts but runs roughly, misfires, or runs poorly with fluctuating RPM.
• Check Engine Light (MIL) illuminated with P0335 stored or pending.
• Intermittent no-start or hard-start condition.
• In some cases, a no-change condition after a battery disconnect/reconnect if the PCM memory isn’t reinitialized.

4. DIAGNOSTIC STEPS

Important note: Begin with the simplest, most likely causes and verify every step with proper diagnostic tools. Gather and verify data with a quality OBD-II scanner and, if available, an oscilloscope or CMP/CKP waveform tool.

• Step 1: Confirm DTCs and vehicle condition

  • Use an OEM or high-quality scan tool to confirm P0335 and check for related codes (P0330–P0339 family). Note any other ignition, fuel, or sensor codes that appear.
  • Observe live data: CKP sensor voltage or digital signal and RPM correlation. Some GM vehicles show a frequency-based CKP signal that correlates to crank speed.

• Step 2: Inspect the obvious

  • Visually inspect the CKP sensor and its connector for corrosion, damage, oil contamination, or loose pins.
  • Inspect the wiring harness for wear, rubbing, or heat damage along the path from the sensor to the PCM.
  • Check mounting: ensure the CKP sensor is properly seated and the reluctor ring is intact and not damaged or misaligned.

• Step 3: Electrical checks

  • Verify battery voltage and charging system. A weak or unstable supply can cause erroneous CKP readings.
  • With the ignition OFF, perform a continuity check from the CKP sensor harness to the PCM harness to ensure an open/short isn’t present.
  • Check for proper reference voltage and ground at the CKP sensor circuit (as per service manual specifications). Look for resistance values in the sensor circuit that are within spec.
  • If available, monitor the CKP signal with an oscilloscope while cranking. You should see a clean, periodic waveform corresponding to crank speed. A missing or erratic waveform indicates a sensor, wiring, or reluctor issue.

• Step 4: Component replacement trials

  • If wiring checks are solid but the CKP signal is missing or erratic, replace the CKP sensor and re-test. Ensure the sensor is the correct part number for the engine family (1.5L or 2.0L) and that it’s installed with correct torque and alignment.
  • After replacement, clear codes and perform a road test or controlled start to confirm the issue is resolved.
  • If the CKP signal remains abnormal after a sensor replacement, investigate PCM-related issues or wiring harness faults further, including potential PCM reprogramming or replacement if indicated by data and service guidance.

• Step 5: Consider related or intermittent issues

  • If the vehicle is intermittently starting and throwing P0335 with no other codes, consider intermittent wiring fault or a failing PCM. Revisit connectors, grounds, and the possibility of another sensor malfunction that mimics CKP symptoms.
  • Check for updates or recalibrations (software/ECU) if the vehicle has a known service bulletin or service update (note: the instruction prohibits citing recalls/TSBs unless in provided data; you can still check for software updates with the dealer, but do not cite specific bulletins here).

5. RELATED CODES

• Commonly related CKP/PCM codes to review alongside P0335:
  • P0330 Crankshaft Position Sensor “A” Circuit
  • P0331 Crankshaft Position Sensor “A” Circuit Range/Performance
  • P0332 Crankshaft Position Sensor “A” Circuit Not Detected
  • P0333 Crankshaft Position Sensor “A” Circuit No Signal
  • P0334 Crankshaft Position Sensor “A” Circuit Intermittent
  • P0336 Crankshaft Position Sensor “A” Ring/Signal
  • P0337 Crankshaft Position Sensor “A” Circuit Low Input
  • P0338 Crankshaft Position Sensor “A” Circuit High Input
  • P0339 Crankshaft Position Sensor “A” Circuit Intermittent

Note: These are commonly associated CKP family codes that may appear or be tested for when diagnosing P0335 on GM vehicles and Malibu.

6. REPAIR OPTIONS AND COSTS (2025 PRICES)

• Important: Prices vary by region, dealer vs. independent shop, and current labor rates. The figures below are typical ranges for 2017-2023 Malibu and are intended as a guide.

• CKP sensor replacement (most common fix)

  • Parts: $15–$60
  • Labor: 0.8–1.5 hours
  • Typical total: $100–$250
  • Notes: This is the most frequent repair when the CKP signal is missing or out of spec. Ensure the sensor matches the correct engine variant (1.5L or 2.0L turbo) and is installed cleanly with proper torque.

• Wiring harness/connector repair or replacement

  • Parts: $5–$100 (connector/insulation/harness sections)
  • Labor: 1–3 hours
  • Typical total: $100–$500
  • Notes: If the issue is a damaged wire, a simple connector replacement or splice repair can restore signal integrity. Ensure proper HV and data integrity testing after repair.

• PCM/ECM diagnostics or replacement

  • Parts: $400–$900 (replacing PCM, not including programming)
  • Labor: 1–4 hours
  • Typical total: $500–$1500
  • Notes: PCM failures are far less common than sensor/wiring issues. If the PCM is at fault, reprogramming or replacement with proper calibration is required.

• Software/ECU update or reflash

  • Parts: N/A (software only)
  • Labor: 0.5–2 hours
  • Typical total: $50–$250
  • Notes: Some Malibus may benefit from software updates that affect crank/CMP input handling. If a technician determines an update is indicated, it can resolve intermittent misreads without hardware replacement.

• Other related repairs you might encounter

  • Oil contamination remediation around sensor area (if contamination is suspected)
  • Ground and shielding fixes if EMI or grounding issues are suspected
  • These are less common but can impact CKP signal quality.

• Data limitation note: No recalls found in NHTSA database for this model in the provided dataset. If you’re considering dealer service, confirm any current advisories or software updates with the dealer or GM service portal.

7. DIY vs PROFESSIONAL

• DIY viability:

  • Easy to moderate for a competent DIYer with basic automotive electrical experience.
  • Tools: standard hand tools, multimeter, and ideally an oscilloscope or a CKP waveform tester if available.
  • Risks: Incorrect sensor installation, improper torque, or misrouted wiring can worsen the problem or cause misdiagnosis. Replacing the CKP sensor is straightforward, but chasing intermittent faults can be time-consuming.

• Professional considerations:

  • A shop with a GM-compatible scan tool and, ideally, an oscilloscope can quickly verify CKP waveform and timing data.
  • Professionals can systematically test continuity, resistance, voltage, and ground, and confirm whether the issue is sensor, wiring, or PCM.

• Decision guidance:

  • If you have a clear, reproducible symptom (no-start or no-signal reading at CKP) and a known-good sensor, replacing the CKP sensor is a reasonable first step.
  • If symptoms persist after sensor replacement, escalate to a full wiring harness inspection and PCM/comms test with professional-grade tools.

8. PREVENTION

• Regular battery and charging system maintenance to ensure clean, stable voltage to sensors and the PCM.
• Protect wiring: keep CKP sensor wiring routed away from hot exhaust components and moving parts; use protective looms or sleeves where applicable; fix any harness chafing promptly.
• Check for oil leaks around the sensor area; oil contamination can degrade sensors and signal integrity.
• Ensure connector integrity: clean, corrosion-free connectors; apply dielectric grease if specified by service procedure to prevent corrosion.
• Schedule periodic diagnostics if you notice drivability issues or any intermittent no-start events; early diagnosis can prevent more expensive repairs.

Additional data note

• In the provided NHTSA data for Chevrolet Malibu (2017-2023), there are two owner complaints listed (P0302 and P0420) and no recalls for this model/year combination. There are no specific P0335 complaints in the supplied data, which means user-facing statistics for P0335 are not available from this dataset. No recalls found in NHTSA database. This guide relies on general CKP knowledge for Malibu and standard diagnostic practices, augmented by the data limitations described.