Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble with the electrical signals that help control the spark in cylinder number 8 of the engine.
The P131C code indicates a problem with the ionic current control module, specifically that the control line for ignition in cylinder 8 is reading a low voltage.
The ionic current control module is responsible for monitoring the combustion process in each cylinder by measuring the ionic current. This current is used to detect misfires and the quality of combustion. A low signal in the control line for cylinder 8 suggests an issue with the ignition system or the module itself.
• Engine misfire
• Poor fuel economy
• Check Engine Light illuminated
• Faulty ionic current control module
• Wiring issues such as shorts or open circuits
• Faulty ignition coil for cylinder 8
Ionic Current: An electrical current used to monitor combustion quality in an engine.
Ignition Coil: A component that converts the battery's voltage to a higher voltage to create a spark in the engine's cylinders.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors to the ionic current control module.
• Test the ignition coil for cylinder 8.
• Repair or replace damaged wiring or connectors.
• Replace the ionic current control module if faulty.
• Replace the ignition coil for cylinder 8 if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular maintenance of the ignition system
• Periodic inspection of wiring and connectors
• Use high-quality fuel
Engine Performance
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult with a professional mechanic for accurate diagnosis.
Check with the vehicle manufacturer for warranty coverage on ignition system components.
This code is commonly associated with vehicles using advanced ignition systems that monitor combustion quality.
Moderate – Addressing this issue promptly can prevent further engine damage.
Driving with an unresolved ignition issue can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in park or neutral
The ionic current control module is typically located near the engine, often integrated into the ignition system.
Q: Can I drive my car with a P131C code?
A: It's not recommended as it can lead to further engine damage and increased emissions.
Q: How can I prevent this issue?
A: Regular maintenance and inspection of the ignition system can help prevent this issue.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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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.