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 getting a signal that's too high from a part that helps monitor the engine's firing in one side of the engine. It's like a sensor is shouting too loudly.
The code P1374 indicates that the signal from the ionic current signal amplification control circuit is higher than expected on bank 2 of the engine.
The ionic current signal amplification control circuit is responsible for monitoring the combustion process in the engine by detecting ionic currents. When the signal is too high, it suggests a malfunction in the circuit or related components on bank 2, which could affect engine performance.
• Check Engine Light (CEL) illuminated
• Poor engine performance
• Increased fuel consumption
• Faulty ionic current sensor
• Wiring issues such as short circuits
• Malfunctioning control module
Ionic Current: A flow of charged particles that can be used to detect combustion in an engine.
Bank 2: The side of the engine that does not contain cylinder 1, typically in a V-type engine.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the ionic current sensor on bank 2 for proper function.
• Replace faulty ionic current sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace control module if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Chevrolet Malibu
• Pontiac Grand Am
• Oldsmobile Alero
• Regularly inspect and maintain engine sensors.
• Ensure wiring and connectors are in good condition.
• Keep the engine control module updated.
Sensor Issue
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle aggressively until the issue is resolved.
Check if the vehicle's powertrain warranty covers sensor-related repairs.
This code has been associated with certain GM vehicles from the late 1990s to early 2000s, often related to ignition system issues.
Moderate – While the vehicle may still be drivable, it's important to address this issue to prevent further engine problems.
Ignoring this code could lead to increased emissions and potential engine damage, which may not comply with local emissions regulations.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The ionic current sensor is typically located near the ignition coils on bank 2 of the engine.
Q: Can I drive with a P1374 code?
A: It's possible, but not recommended as it can lead to further engine issues.
Q: How do I reset the Check Engine Light after fixing the issue?
A: Use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes.
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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.