Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the car's ability to measure and control the electric signals in the engine, kind of like a broken wire in a toy that stops it from working.
The P1372 code indicates an issue with the circuit responsible for amplifying the ionic current signal in the engine's Bank 1. This signal is used to monitor combustion quality and detect misfires.
The ionic current signal amplification control circuit is part of the engine's management system that helps monitor combustion by measuring the ionic current in the combustion chamber. An open circuit means there is a break or disconnection in the wiring or components, preventing the system from functioning correctly.
• Check Engine Light is on
• Engine misfires
• Poor fuel economy
• Faulty ionic current sensor
• Damaged wiring or connectors
• Failed control module
Ionic Current: An electrical current generated during the combustion process in an engine.
Bank 1: The side of the engine with cylinder number 1, often used in V-type engines.
• Inspect the wiring and connectors for damage or disconnection.
• Test the ionic current sensor for proper operation.
• Check the control module for faults.
• Repair or replace damaged wiring or connectors.
• Replace the ionic current sensor if faulty.
• Replace or reprogram the control module if necessary.
• OBD-II scanner
• Multimeter
• Wiring repair kit
$150 - $500
Moderate
• Saab 9-3
• Saab 9-5
• Chevrolet Malibu
• Regularly inspect engine wiring for damage.
• Perform routine engine maintenance.
• Use quality fuel to prevent combustion issues.
Sensor Issue
• Address this issue promptly to avoid further engine damage.
• Consult a professional mechanic if unsure about the repair.
Check with your vehicle manufacturer; some components may be covered under warranty.
This code has been more common in vehicles with advanced ignition systems that use ionic current sensing for combustion monitoring.
Moderate – While the vehicle may still run, ignoring this issue can lead to more severe engine problems.
Driving with a malfunctioning engine sensor can lead to increased emissions and potential safety risks.
• Engine at operating temperature
• Vehicle in park or neutral
The ionic current sensor is typically located near the ignition coils on the engine's Bank 1.
Q: Can I drive with a P1372 code?
A: It's not recommended to drive for extended periods with this code as it can lead to engine misfires and damage.
Q: How do I clear a P1372 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.
View options on Amazon
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.