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 an imbalance in the fuel mixture in one part of the engine. It's like if one part of a cake had too much sugar and another part didn't have enough.
The P1174 code indicates that the engine control module (ECM) has detected an imbalance in the fuel trim for one of the cylinders in bank 1, which means the air-fuel mixture is not consistent across all cylinders.
The P1174 code is set when the ECM detects a variation in the fuel trim for a specific cylinder in bank 1. This can occur due to issues such as a faulty fuel injector, a vacuum leak, or a problem with the mass airflow sensor. The ECM continuously monitors the fuel trim adjustments to maintain optimal engine performance and emissions.
• Check Engine Light is on
• Rough idle
• Poor fuel economy
• Engine misfire
• Faulty fuel injector
• Vacuum leak
• Mass airflow sensor malfunction
• Oxygen sensor failure
• Exhaust leak
Fuel Trim: Adjustments made by the engine control module to the air-fuel mixture.
Bank 1: The side of the engine with cylinder number 1.
• Check for any other diagnostic trouble codes.
• Inspect the fuel injectors for proper operation.
• Check for vacuum leaks in the intake system.
• Test the mass airflow sensor.
• Inspect the oxygen sensors for proper function.
• Replace or clean faulty fuel injectors.
• Repair any vacuum leaks found.
• Replace the mass airflow sensor if faulty.
• Replace faulty oxygen sensors.
• Repair any exhaust leaks.
• OBD-II scanner
• Fuel pressure gauge
• Multimeter
• Vacuum gauge
• Smoke machine for leak detection
$150 - $500
Moderate
• Chevrolet Malibu
• Pontiac Grand Prix
• Buick Regal
• Regular maintenance and inspection of fuel system components.
• Ensure air filters are clean and replaced regularly.
• Use high-quality fuel to prevent injector clogging.
Engine Performance
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
Check with the vehicle manufacturer for specific warranty coverage related to emissions and engine performance issues.
The P1174 code has been commonly associated with GM vehicles and typically indicates issues with fuel delivery or air intake systems.
Moderate – It is important to address this issue to prevent potential engine damage and to ensure optimal performance.
Driving with a malfunctioning engine can lead to increased emissions and may not comply with local environmental regulations.
• Engine at operating temperature
• Vehicle in closed-loop operation
The camshaft position sensor is typically located near the top of the engine, often on the cylinder head or camshaft housing.
Q: Can I drive my car with a P1174 code?
A: It's not recommended to drive for extended periods with this code active, as it can lead to further engine issues.
Q: What happens if I ignore the P1174 code?
A: Ignoring the code can result in poor engine performance, reduced fuel efficiency, and potential engine damage.
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Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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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
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
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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.