Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's computer has noticed that the engine is making a knocking noise that's louder than usual. This is like when you hear a loud banging noise in a machine, which means something isn't working right.
The engine control module (ECM) has detected a severe knocking condition in the engine, which could indicate a problem with the engine's timing or fuel mixture.
The P136C code is triggered when the ECM detects an abnormal combustion event, commonly known as 'super knocking.' This can occur due to pre-ignition or detonation, where the air-fuel mixture in the cylinder ignites prematurely, causing a sharp pressure spike that can damage the engine.
• Engine knocking noise
• Reduced engine performance
• Check Engine Light is on
• Poor quality fuel
• Incorrect ignition timing
• Faulty knock sensor
ECM: Engine Control Module
Knock Sensor: A sensor that detects engine knocking or pinging
• Check for any related codes and address them first.
• Inspect the fuel for quality and contamination.
• Test the knock sensor for proper operation.
• Replace the knock sensor if faulty.
• Use higher octane fuel to prevent knocking.
• Adjust the ignition timing if necessary.
• OBD-II scanner
• Fuel pressure gauge
• Timing light
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford Focus
• Use recommended fuel grade.
• Regularly maintain the ignition system.
• Keep engine components clean and in good condition.
Engine Performance
• Avoid hard acceleration until the issue is resolved.
• Have the vehicle checked by a professional mechanic.
Check with your vehicle manufacturer; some powertrain warranties may cover engine-related issues.
This code has been associated with issues in vehicles using direct injection engines, which are more prone to knocking.
High – Prolonged knocking can cause severe engine damage.
Ignoring this code can lead to engine damage, which may not be covered under warranty if not addressed promptly.
• Engine at operating temperature
• Vehicle under load
The knock sensor is typically located on the engine block, cylinder head, or intake manifold.
Q: What happens if I ignore the P136C code?
A: Ignoring this code can lead to serious engine damage due to prolonged knocking.
Q: Can I drive my car with a P136C code?
A: It's not recommended to drive with this code active, as it can cause further damage to the engine.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.