P0333

Code

GWM P — Powertrain

- High reading 2 of the knock sensor (bank 2)

Brand: GWM

Type: P — Powertrain

Views: UK: 14 EN: 25 RU: 26

AI status

Completed

ready

Completed 100%

Page language: EN

Damaged or failed knock sensor (bank 2)
Open circuit, short to battery voltage, or poor connection in the sensor harness
Corroded or loose connector or terminal at sensor or ECM
Short to another circuit or high-resistance ground
Faulty ECM (rare)
Engine mechanical issue causing abnormal sensor output (severe detonation or mounting problems)

Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
Possible engine knock/detonation warning or perceived pinging under load
Reduced engine performance or ignition timing retard (ECM limp or protection strategy)
Rough idle or hesitation under load (if ignition timing is adjusted by ECM)
Noisy engine mounting or vibration if sensor physically loose

Read and record freeze-frame and live data for knock sensor bank 2 using a scan tool
Visually inspect knock sensor, harness, and connector at bank 2 for damage, corrosion, oil ingress, or loose mounting
Check for other stored codes that may relate (ignition, fuel, ECM communications)
Wiggle test: with engine idling and scan tool connected, gently move harness and connector to see if signal changes or code reappears
Check connector pins for bent, pushed-out, corroded or backed-out terminals
Measure continuity between sensor connector and ECM pin (with ignition off) to verify no open/short to other circuits or ground

Sensor type: piezoelectric (typically 1–3 wires depending on vehicle). Outputs AC pulses in response to vibration/knock
Normal behavior: low-level intermittent AC pulses that correspond to combustion events or knock — not a continuous high DC voltage
Fault condition: signal stuck high (near battery voltage) or above expected amplitude, or no pulse activity when engine is running under load
Practical check: sensor signal should change under load/acceleration; a constant high voltage (>4.5 V) or no change suggests wiring/sensor fault

Verify DTC and record freeze-frame data with a scan tool; clear the code and perform a drive cycle to recheck
Perform visual inspection of the knock sensor (bank 2), mounting bolt and surrounding area for oil contamination or looseness; ensure sensor is torqued to spec
Inspect wiring and connector for damage, corrosion, water/oil ingress; repair or replace damaged sections
With ignition OFF, check continuity from sensor signal pin to ECM signal pin; check for short to battery or ground
With ignition ON or engine cranking, backprobe the signal and reference circuits: verify reference voltage/gnd (if present) and confirm signal is not stuck at battery voltage
Use an oscilloscope to view the knock sensor waveform while bringing the engine to load; compare waveform to known-good sensor/bank 1 or swap sensors (if identical) to see if DTC follows the sensor
If swapping sensors moves the code to the other bank, replace the sensor on the original bank 2
If wiring and sensor check good, inspect and test ground and power supplies to ECM; consult wiring diagram for pinouts and repair as needed
If all electrical checks pass and fault persists, consider ECM/PCM fault — confirm with dealer-level diagnostics or ECU bench testing

⚠️ Status

MIL on. ECM reports high (abnormal) voltage input from knock sensor circuit on bank 2. Fault stored in memory with freeze-frame data available.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

P0333 — - High reading 2 of the knock sensor (bank 2)