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 has detected a problem with the spark plug or ignition coil in cylinder number 4. It's like when a sparkler doesn't light up properly.
The ion sensing module in the ignition system has detected a fault in the ignition coil for cylinder 4.
The P1376 code is triggered when the ion sensing module (part of the ignition system) detects an issue with the ignition coil in cylinder 4. This could be due to a failure in the coil's ability to produce the necessary spark for combustion or a fault in the ion sensing circuit.
• Engine misfire
• Rough idling
• Decreased fuel efficiency
• Faulty ignition coil in cylinder 4
• Wiring issues or poor connections
• Faulty ion sensing module
Ignition Coil: A component that transforms the battery's voltage to a much higher voltage to create a spark in the spark plugs.
Ion Sensing Module: A system that detects misfires by measuring ionization in the combustion chamber.
• Use an OBD-II scanner to confirm the code.
• Inspect the ignition coil and wiring for cylinder 4.
• Test the ignition coil's resistance and operation.
• Replace the faulty ignition coil.
• Repair or replace damaged wiring or connectors.
• Replace the ion sensing module if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Saab 9-3
• Saab 9-5
• Chevrolet Malibu
• Regularly inspect ignition components.
• Ensure proper maintenance of spark plugs.
• Check for wiring issues periodically.
Engine Performance
• Have the ignition system checked regularly.
• Replace spark plugs and coils as per manufacturer recommendations.
Check with the vehicle manufacturer for specific warranty coverage on ignition components.
This code is commonly associated with vehicles using ion sensing ignition systems, particularly in some Saab models.
Moderate – The vehicle may run with reduced performance, but prolonged driving could cause further damage.
Driving with a misfire can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in idle or low-load conditions
The ignition coil for cylinder 4 is located on the engine, typically above the spark plug for cylinder 4.
Q: Can I drive with a P1376 code?
A: It's not recommended to drive for long periods with this code, as it can cause further engine damage.
Q: How do I know if my ignition coil is bad?
A: Common signs include engine misfires, rough idling, and poor fuel economy.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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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.