P2336 — Cylinder 1 Above Knock Threshold
powertrain (engine/transmission)
Is it safe to drive?
Drive with caution Drive gently and avoid hard acceleration. With knock detection off, the engine is not protected from detonation — sustained pinging under load can damage pistons and bearings over time.
How to diagnose with an OBD scanner
- Read the code and freeze frame Connect an OBD2 scanner, confirm P2336 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the knock (detonation) detection for damage, corrosion, chafing or poor contact.
- Subsystem check Inspect the knock sensor connector and wiring — heat and vibration damage them often.
- Subsystem check Check sensor torque and mounting surface; an improperly seated sensor reads incorrectly.
- Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2336 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2336 (parts and labor, USD, independent shop rates): Decarbonization service: $150–$400; Repair sensor wiring: $80–$250; Replace the knock sensor: $150–$450. Overall, fixing P2336 usually costs between $80 and $450. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Common questions
How much does it cost to fix P2336?
Decarbonization service — $150–$400; Repair sensor wiring — $80–$250; Replace the knock sensor — $150–$450. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
Is it safe to drive with P2336?
Drive gently and avoid hard acceleration. With knock detection off, the engine is not protected from detonation — sustained pinging under load can damage pistons and bearings over time.
What does OBD2 code P2336 mean?
Cylinder 1 Above Knock Threshold (P2336): a powertrain (engine/transmission) fault affecting the knock (detonation) detection. Short, gentle driving to a shop is usually possible. Most often caused by low-octane or contaminated fuel, failed knock sensor, engine carbon buildup causing real detonation.
What is the most common cause of P2336?
The most common causes are: low-octane or contaminated fuel, failed knock sensor, engine carbon buildup causing real detonation.
What are the symptoms of P2336?
Drivers most often notice: Check Engine Light on, worse fuel economy, reduced power (ECM retards timing), metallic pinging under acceleration.
What does P2336 mean?
Behind P2336 is a specific failure in the knock (detonation) detection: cylinder 1 above knock threshold. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.
P2336 refers specifically to cylinder 1. On inline engines cylinders are counted from the front (belt end); on V-engines the numbering depends on the manufacturer, so check the firing-order diagram for your exact model. Location matters for the repair bill: some cylinders require intake manifold removal, which adds labor time.
To set P2336, the control module compares live readings of the knock (detonation) detection against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.
What causes P2336?
- loose sensor mounting or incorrect torque
- damaged knock sensor wiring or connector
- low-octane or contaminated fuel
- failed knock sensor
- engine carbon buildup causing real detonation
Common symptoms of P2336
- Check Engine Light on
- worse fuel economy
- reduced power (ECM retards timing)
- metallic pinging under acceleration
- often no audible symptoms
How to diagnose P2336
- Connect an OBD2 scanner, confirm P2336 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Visually inspect the wiring harness and connectors related to the knock (detonation) detection for damage, corrosion, chafing or poor contact.
- Inspect the knock sensor connector and wiring — heat and vibration damage them often.
- Check sensor torque and mounting surface; an improperly seated sensor reads incorrectly.
- Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2336 does not return.
How to fix P2336
Start with the cheapest and most common causes before replacing expensive parts:
- Decarbonization service — $150–$400
- Repair sensor wiring — $80–$250
- Replace the knock sensor — $150–$450
How much does it cost to fix P2336?
Repair cost depends on which component actually failed. Typical scenarios for P2336 (parts and labor, USD, independent shop rates):
- Decarbonization service: $150–$400
- Repair sensor wiring: $80–$250
- Replace the knock sensor: $150–$450
Overall, fixing P2336 usually costs between $80 and $450. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Can you drive with P2336?
Drive gently and avoid hard acceleration. With knock detection off, the engine is not protected from detonation — sustained pinging under load can damage pistons and bearings over time.