How do I get my Chevy out of reduced power mode?

Reduced Power Mode in a Chevy is a limp mode that limits engine power to protect the drivetrain. The quickest path back to normal driving is to diagnose and fix the underlying fault rather than simply resetting the system.

What reduced power mode means in Chevrolets

In many Chevrolet models, the powertrain control module (PCM) reduces throttle response and limits acceleration when a fault is detected in the fuel, air, ignition, or electrical systems. This safety measure, sometimes called Engine Power Reduced or similar, can be triggered by sensor faults, throttle-by-wire issues, low battery voltage, overheating, or emissions-related faults. The vehicle remains drivable, but with restricted performance, until repairs address the root cause.

Steps to safely diagnose and exit reduced power mode

Before you start, pull over in a safe location, engage the parking brake, and consider seeking professional help if you’re unsure. The following steps are practical for most Chevrolet models and aim to distinguish quick fixes from deeper problems.

Immediate safety and basic checks

These actions address conditions you can handle without specialized tools and can reveal obvious causes or prevent further damage.

• Safely pull over, park, and restart the engine. If the warning persists or power remains limited, avoid aggressive driving and proceed with further diagnostics.


• Check for warning lights and obvious issues, such as a Check Engine light, transmission warnings, or traction-control notices, which guide the next steps.


• Verify battery health and connections. A weak 12-volt battery or loose clamps can trigger limp mode. If the voltage is low (around 12.6V when off, higher when running), consider charging or replacing the battery.


• Inspect the gas cap and obvious EVAP-system concerns. A loose or faulty gas cap can generate emissions-related codes that interact with engine performance.

Concluding note: If you notice electrical issues, low battery voltage, or persistent loss of power, limit driving and seek professional help to avoid getting stranded.

Diagnostic steps and potential fixes

If basic checks don’t restore normal power, proceed with diagnostics to identify the fault using a scan tool and systematic checks. This guidance assumes you have access to an OBD-II scanner or a service technician can perform the scan.

• Use an OBD-II scanner to retrieve trouble codes and note freeze-frame data to guide diagnosis. Address the highest-priority codes first.


• Consider throttle- or sensor-related faults: inspect the throttle body for buildup, test or replace the accelerator pedal position sensor, and verify the throttle position sensor readings and wiring.


• Check electrical health: inspect relevant fuses, wiring, grounds, and the charging system (battery and alternator) to ensure stable power and proper PCM communication.


• Inspect air and emission components: ensure a clean air filter, check for vacuum leaks, and verify EVAP system operation (including purge valve) if indicated by codes.


• If codes point to throttle or pedal components, consider cleaning or replacing the throttle body or sensor and reseating connectors for any corrosion or looseness.


• System reset can sometimes clear transient faults but does not fix root causes; a controlled power cycle (such as a brief disconnection of the battery) may clear codes but should be done with caution and awareness of data loss in some systems.


• Test drive cautiously after any repairs or resets to confirm normal operation and ensure the fault does not recur.


• If the diagnostic readout suggests a PCM/ECU issue or a persistent throttle-by-wire fault, contact a Chevrolet dealer or qualified technician for in-depth diagnosis and component replacement if needed.

Concluding note: Persistent faults often require targeted repairs—such as throttle body replacement, pedal assembly service, or wiring repairs—and may involve software updates or recalls. A professional diagnosis ensures you get the correct fix for your specific model and year.

Common causes and what to check with a technician

Technicians typically investigate several fault categories when diagnosing reduced power mode in Chevys. Being aware of these areas helps you discuss symptoms and potential repairs with a professional.

• Throttle-by-wire system problems: throttle body, accelerator pedal position sensor, throttle position sensor, and related wiring.


• Electrical faults: battery/charging health, grounds, fuses, and connector integrity affecting PCM and sensors.


• Air/fuel delivery and emissions: dirty MAF sensor, vacuum leaks, clogged air filter, fuel-delivery issues, or EVAP faults.


• Engine performance faults: misfires, ignition issues, or sensor failures that affect timing and fueling.


• Drivetrain concerns: transmission sensors or torque-converter-related faults that can contribute to perceived loss of power in some scenarios.

Note that exact fault codes and remedies vary by model and year. Ask the dealer or a certified repair shop to check for open recalls or relevant service bulletins (TSBs) that address known issues causing reduced power.

What to expect at the dealership or with a mechanic

At the dealer, technicians will perform a factory-grade diagnostic scan, review service history, check for open recalls, and may update software or replace faulty components. Some issues are addressed by service bulletins or targeted recalls that can simplify or reduce repair costs.

Bottom line: If your Chevy enters reduced power mode, diagnose the fault and address the root cause rather than relying on a reset. With timely diagnosis and appropriate repairs, normal power and drivability can usually be restored.

Summary

Reduced power mode in a Chevy signals a protective limp condition triggered by a fault in the engine, fuel, ignition, throttle, or electrical systems. Start with a safe stop, retrieve diagnostic codes, inspect electrical health, and address throttle or emissions-related issues as indicated. If the fault persists, seek professional diagnosis and repair, and check for recalls or service bulletins relevant to your model. Timely diagnosis and proper repairs help restore full power and prevent further damage.

What is the recall on Chevy reduced engine power?

Chevy recalled over 300,000 Malibu vehicles from the 2013-2015 model years due to a software issue causing reduced engine power. The recall called for Malibu models to receive a software update to correct the defect that triggered the “Engine Power Reduced” message.

Can you drive with reduced power mode?

Yes, you can typically drive in reduced power mode (or "limp mode") to get to a safe location or repair shop, but it is not recommended for long distances or high-speed driving. This mode is a safety feature that limits power to prevent further damage, but continued driving can be dangerous, especially on highways. It is best to pull over as soon as safely possible, turn off the engine, and then decide whether to have the vehicle towed or to attempt a temporary reset by restarting the car after a short waiting period. 
What to do when you see the warning

• Pull over safely: Find a safe spot to pull over, park, and turn off the engine. 
• Check gauges: Before restarting, check the engine temperature gauge to ensure the engine is not overheating. 
• Restart the vehicle: After a brief pause (around 15-20 seconds), restart the engine. This may temporarily clear the code and restore normal power, but the underlying issue still needs to be addressed. 
• Drive cautiously: If the car allows you to drive, do so cautiously, avoiding high speeds and heavy acceleration. Only drive as far as necessary to get to a repair shop or home. 
• Get a diagnosis: Do not ignore the warning. You should have the car professionally inspected as soon as possible, as the issue will likely cause the car to enter limp mode again. 

Why reduced power mode happens
This mode is triggered by the car's computer when it detects a problem with the engine or electrical system to prevent catastrophic damage. Common causes include: 

• Issues with the throttle body or accelerator pedal position (APP) sensors
• Problems with engine sensors, such as the crankshaft position sensor
• Air intake leaks
• Faulty spark plugs
• Engine management system faults or a bad valve cover gasket

How do I fix reduced engine power mode?

To fix an "engine malfunction reduced power" warning, first safely pull over and restart the vehicle as a temporary fix. If the light returns, diagnose the issue by scanning for error codes and checking for problems like a clogged air filter, faulty sensor (like the MAF or O2), or dirty throttle body, which can often be cleaned or replaced. For more complex issues, such as fuel system problems, catalytic converter clogs, or transmission issues, it may require professional diagnosis and repair. 
Initial checks and resets 
This video explains the initial steps to take when you see the "Engine Malfunction Reduced Power" warning: 1mPete's GarageYouTube · Jan 28, 2023

• Pull over safely: Find a safe place to stop your vehicle. 
• Restart the engine: Turn the car off completely, wait a minute, and then restart it. This can sometimes clear a temporary issue. 
• Check gauges: Look at your temperature and pressure gauges to see if the engine is overheating or if oil pressure is low. 
• Inspect fluids: Check your engine oil, coolant, and transmission fluid levels. 
• Scan for codes: Use an OBD-II scanner to get a more specific diagnosis by reading the diagnostic trouble codes (DTCs). 

Common causes and fixes

• Clogged air filter: A simple fix is to check and replace a dirty air filter, which restricts airflow to the engine. 
• Faulty sensors: Problems with the Mass Air Flow (MAF) sensor or Oxygen (O2) sensor can cause issues. A faulty throttle position sensor is also a common culprit. 
• Dirty throttle body: The throttle body can get dirty, restricting airflow. Cleaning it may solve the problem. 
• Fuel system issues: A clogged fuel filter, weak fuel pump, or dirty fuel injectors can starve the engine of power. These components may need to be cleaned or replaced. 
• Exhaust blockage: A clogged catalytic converter can cause significant performance loss. This requires professional diagnosis and may need replacement. 
• Electrical issues: Check for loose or corroded battery cables and wiring, as these can cause erratic sensor readings. 
• Engine overheating: Low coolant levels or a failing cooling system component like the thermostat can trigger the warning to protect the engine. 
• Transmission problems: Issues with the transmission, either mechanical or sensor-related, can cause the car's computer to reduce power. 
• Failing ECM: Though less common, a faulty Engine Control Module (ECM) can also be the cause. 

When to seek professional help 
This video discusses the common causes of "Engine Malfunction Reduced Power" and what to do: 1mNexologyYouTube · Aug 12, 2025
Some issues, such as those involving the transmission, catalytic converter, or ECM, often require professional expertise and tools. If the simple fixes don't resolve the problem, or if you're uncomfortable performing the checks, it's best to consult a qualified mechanic. 
You can watch this video to see how a dirty throttle body can cause the "Engine Malfunction Reduced Power" warning and how to clean it: 1mMatt's ShopYouTube · Jun 13, 2025

What causes reduced engine power on a Chevy?

Reduced engine power in a Chevy is caused by issues with sensors, the throttle body, or the fuel and exhaust systems, and it's often a failsafe to protect the engine. Common culprits include dirty throttle bodies, faulty throttle position sensors (TPS) or accelerator pedal position sensors (APP), and a clogged catalytic converter. Electrical problems, such as damaged wiring, can also trigger this mode. 
This video shows how to fix reduced engine power on a Chevy truck: 58sMatt's ShopYouTube · Oct 19, 2024
Common causes for reduced engine power

• Throttle body and sensors: A dirty throttle body, malfunctioning throttle position sensor, or faulty accelerator pedal position sensor can all cause this warning. The Engine Control Module (ECM) may limit power if the sensors disagree or the throttle body is dirty. 
• Fuel system issues: A clogged fuel filter, bad fuel pump, or dirty fuel injectors can prevent the engine from getting enough fuel. 
• Air intake and exhaust restrictions: A clogged air filter or a blocked catalytic converter can prevent the engine from getting enough air or expelling exhaust gases properly. 
• Electrical problems: Damaged wiring, loose connections, blown fuses, or a failing ECM can disrupt communication between engine components and trigger the reduced power mode. 
• Cooling system problems: The engine may enter reduced power mode if it is overheating due to low coolant or oil levels to prevent damage. 
• Other issues: Faulty oxygen (O2cap O sub 2𝑂2) sensors, transmission problems, or issues with knock sensors can also be the cause. 

You can watch this video to learn more about how to fix reduced engine power in your car: 58sLife After LifeYouTube · Sep 17, 2017
What to do

1. Safely pull over: Stop the vehicle at the first safe location. 
2. Check fluid levels: Ensure engine oil and coolant levels are correct. 
3. Scan for codes: Use an OBD-II scanner to check for diagnostic trouble codes (DTCs). Many auto parts stores offer this service for free. 
4. Clean the throttle body: If the code points to a dirty throttle body, cleaning it may resolve the issue. 
5. Address the root cause: Based on the trouble codes, address the specific component that is failing, whether it's a sensor, a clogged part, or an electrical issue. 
6. Seek professional help: If the problem is complex, such as a failing ECM, it is best to take the vehicle to a qualified mechanic.