# Why does my car jerk when I accelerate? **Verdict:** Drive to a shop this week - **Most common cause:** Misfire from worn spark plugs or ignition coils - **Urgency:** This week - **Typical fix:** $100-$1,200 - **Causes to check:** 5 ## Quick answer A car that jerks, bucks or lurches when you press the gas most often has an engine misfire under load from worn spark plugs or a weak coil. Harsh or slipping transmission shifts, worn engine mounts, fuel delivery problems and a faulty throttle sensor are the other usual causes. Have it diagnosed within a week. ## What is happening? When you press the gas, the engine should add power smoothly and the transmission should pass it to the wheels without a bump. A jerk means that flow of power is being interrupted and then restored suddenly. A misfiring cylinder skips its push, a lean mixture briefly starves the engine, a faulty pedal sensor sends a bad signal, or the transmission grabs a gear too hard. Worn mounts let the engine lurch even when the power itself is smooth. It matters for two reasons. Sudden surges or power cuts are hard to predict, which is risky when pulling into traffic or merging. And the most common causes damage other parts if left alone: a misfire can overheat the catalytic converter, and a transmission that bangs or slips wears its clutches faster. Noting exactly when the jerk happens, such as at a shift or at a pedal position, saves diagnosis time. ## What causes it? The 5 most likely reasons 1. **Misfire from worn spark plugs or ignition coils** (most common), $150-$600. Under acceleration, cylinder pressure rises and a worn plug or failing coil can no longer push a spark across the gap. The cylinder skips a power stroke and the car bucks, often in a repeating rhythm. It is most common past the plug change interval, during hard acceleration or uphill, and in wet weather when coil boots leak spark. How to confirm: The check engine light comes on or flashes under acceleration, and a code reader shows P0300 or a code from P0301 to P0308. The jerk is worse uphill or with passengers. Fix: Replace spark plugs and the failed coil. 2. **Transmission shifting harshly or slipping** (common), $150-$900. An automatic that is low on fluid, running worn-out fluid or has a sticking shift solenoid can bang into gear or flare and then catch, which feels like a jerk at the same speed every time. CVTs can shudder instead. It is more likely past about 60,000 miles without a fluid service, or with towing. How to confirm: The jerk happens at the moment of a gear change, the RPM flares before it catches, or the shift light or check engine light shows a code such as P0700 or P0730. Fix: Service the fluid or repair the shift solenoid. 3. **Worn engine or transmission mounts** (common), $200-$800. Mounts let the engine twist slightly when torque is applied. When they crack or collapse, the engine rocks hard as you press or release the gas, and you feel a sharp lurch or clunk instead of a smooth pull. It is most noticeable on tip-in from a stop or when backing off the gas in stop-and-go driving. How to confirm: The jerk is a single clunk when you first press or lift off the gas, with no codes. A helper sees the engine rise when you briefly load it in Drive and Reverse with the brake held. Fix: Replace the worn mounts. 4. **Fuel delivery problem** (less common), $150-$1,200. Clogged injectors, a weak fuel pump or a clogged fuel filter cannot keep up when you ask for more power, so the engine runs lean for a moment and surges. The jerk usually comes with hesitation, gets worse as the tank runs low, and often sets lean codes. High-mileage cars and those that sit for weeks are more prone. How to confirm: Lean codes such as P0171 or P0174 are stored, the jerking is worst at highway merges or uphill, and a shop measures low fuel pressure under load. Fix: Clean injectors or replace the pump or filter. 5. **Faulty throttle or accelerator pedal sensor** (less common), $100-$500. Modern cars use sensors on the pedal and throttle body to tell the computer how far you pressed the gas. A worn spot in the sensor sends a signal that drops out, so power surges or cuts at the same pedal position. A dirty throttle body can add to it. The car may also go into a reduced-power mode. How to confirm: A code such as P0121, P0122 or P0123 is stored, the jerk happens at the same light pedal position, or a reduced-power warning appears on the dash. Fix: Clean the throttle body or replace the sensor. ## How to narrow it down at home 1. Read the codes with an OBD-II scanner. Misfire codes point to plugs and coils, P07xx codes to the transmission, and P012x codes to the throttle sensor. 2. Watch the tachometer when it jerks. A jerk right as the RPM drops for a shift points to the transmission; a jerk with steady RPM points to the engine or mounts. 3. Check the transmission fluid if your car has a dipstick, with the engine warm and running as your manual says. Low, dark or burnt-smelling fluid is a clue. ## Is it safe to drive? > **Drive to a shop this week.** Mild jerking is usually safe to drive gently to a shop within a few days. If the check engine light flashes, the car drops into reduced power, or it surges unexpectedly in traffic, limit driving and get it checked right away, since sudden power changes can be dangerous at intersections and merges. ## When does it become urgent? - The check engine light is flashing: ease off and drive gently to a shop. - The car goes into reduced-power or limp mode, or surges on its own. - The transmission slips, with RPM rising but the car not speeding up. - You smell burning fluid or see red fluid under the car. - Loud clunks come from the engine bay every time you press or release the gas. ## What will the repair cost? | Cause | Fix | Typical cost | | --- | --- | --- | | Misfire from worn spark plugs or ignition coils | Replace spark plugs and the failed coil | $150-$600 | | Transmission shifting harshly or slipping | Service the fluid or repair the shift solenoid | $150-$900 | | Worn engine or transmission mounts | Replace the worn mounts | $200-$800 | | Fuel delivery problem | Clean injectors or replace the pump or filter | $150-$1,200 | | Faulty throttle or accelerator pedal sensor | Clean the throttle body or replace the sensor | $100-$500 | Detailed breakdowns: [spark plug replacement cost](/cost/spark-plug-replacement), [ignition coil replacement cost](/cost/ignition-coil-replacement), [transmission fluid change cost](/cost/transmission-fluid-change), [fuel pump replacement cost](/cost/fuel-pump-replacement). ## What to tell your mechanic Tell the shop whether the jerk happens at a gear change, at a certain speed or pedal position, cold or hot, and uphill or on flat roads, and whether any warning lights came on. They will read codes and misfire counts, road test while watching live data, check fuel trims and pressure, inspect plugs and coils, and check transmission fluid and mounts. ## How to prevent it - Change spark plugs at the interval in your owner's manual. - Service the transmission fluid on the schedule for your driving, sooner if you tow. - Clean the throttle body when idle or tip-in response starts to feel uneven. - Avoid running the tank near empty, which makes the fuel pump work hotter. - Have a check engine light read early instead of waiting for it to flash. ## Which models get the most transmission and drivetrain complaints? | Model | Transmission and drivetrain complaints to NHTSA | All complaints | | --- | --- | --- | | [Jeep Cherokee](/vehicles/jeep-cherokee) | 3,762 | 7,486 | | [Chevrolet Silverado](/vehicles/chevrolet-silverado) | 1,987 | 7,658 | | [Ford Escape](/vehicles/ford-escape) | 1,802 | 10,274 | | [Ford Explorer](/vehicles/ford-explorer) | 1,232 | 9,238 | | [Ford Edge](/vehicles/ford-edge) | 1,189 | 5,306 | | [Hyundai Tucson](/vehicles/hyundai-tucson) | 1,136 | 5,363 | | [Chrysler Pacifica](/vehicles/chrysler-pacifica) | 1,118 | 4,083 | | [GMC Sierra](/vehicles/gmc-sierra) | 1,112 | 5,041 | | [Ram 1500](/vehicles/ram-1500) | 956 | 7,390 | | [Jeep Grand Cherokee](/vehicles/jeep-grand-cherokee) | 948 | 5,477 | Owner complaints filed with NHTSA in the transmission and drivetrain category for 2015-2026 models of 63 popular cars. Counts follow sales as well as reliability, so compare each with the model's total. ## Trouble codes that often go with it - [P0300](/codes/p0300): Random/Multiple Cylinder Misfire Detected - [P0301](/codes/p0301): Cylinder 1 Misfire Detected - [P0171](/codes/p0171): System Too Lean (Bank 1) - [P0174](/codes/p0174): System Too Lean (Bank 2) - [P0121](/codes/p0121): Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance - [P0122](/codes/p0122): Throttle/Pedal Position Sensor/Switch "A" Circuit Low - [P0123](/codes/p0123): Throttle/Pedal Position Sensor/Switch "A" Circuit High - [P0700](/codes/p0700): Transmission Control System (MIL Request) - [P0730](/codes/p0730): Incorrect Gear Ratio - [P0741](/codes/p0741): Torque Converter Clutch Solenoid Circuit Performance/Stuck Off ## Frequently asked questions ### Why does my car jerk when I accelerate slowly? Jerking under light, gentle acceleration often comes from a worn throttle or pedal sensor, a dirty throttle body, or a torque converter clutch shudder at about 30 to 50 mph. Worn mounts can also clunk on light tip-in. A misfire is more likely to show up under heavier acceleration or uphill. ### Can bad spark plugs make a car jerk? Yes, worn plugs are the most common cause of jerking under acceleration. As the gap widens, the coil cannot fire it when cylinder pressure is high, so the cylinder skips. New plugs at the interval in your manual, often 60,000 to 100,000 miles, usually fix it unless a coil has also failed. ### Can a transmission problem cause jerking? Yes. Low or worn fluid, a sticking shift solenoid or a worn torque converter can cause harsh shifts, slipping or a shudder that feels like a jerk. If it happens right at a gear change, the transmission is the likely cause. A fluid check and code scan are the first steps. ### Is it safe to drive a car that jerks when accelerating? Mild jerking is usually safe for a short drive to a shop. Limit driving if the check engine light flashes, the car goes into reduced power, or it surges without warning, because sudden power changes are risky when merging. Get it diagnosed within a week to avoid catalytic converter or transmission damage. ### How much does it cost to fix a car that jerks when accelerating? Spark plugs and a coil cost about 150 to 600 dollars, a transmission fluid service 150 to 400, engine mounts 200 to 800, a throttle sensor 100 to 500, and a fuel pump about 500 to 1,200 dollars at an independent shop in 2026. A diagnosis usually costs 100 to 180 dollars. ### Why does my car jerk when accelerating from a stop? A jerk right from a stop is often worn engine or transmission mounts, a harsh first-to-second shift, or a throttle sensor fault at the first bit of pedal travel. On rear-drive vehicles, a worn driveshaft U-joint can clunk too. A misfire can also show up as a stumble from a stop. ### Can a dirty air filter cause jerking? A very clogged air filter usually makes a car sluggish rather than jerky. However, a torn or poorly fitted filter lets dirt foul the mass air flow sensor, and a dirty MAF sensor can cause surging and jerking. Filters are cheap and easy to check, so it is a sensible first look. ### Why does my car jerk when accelerating at low speed? Low-speed jerking often comes from the transmission shifting between first, second and third, or from a CVT or torque converter shudder. Worn mounts and a faulty throttle sensor also show up most in slow traffic. Watching the tachometer helps: a jerk as the RPM drops for a shift points to the transmission. ### Can bad gas cause a car to jerk? It can. Water in the fuel or very old fuel burns unevenly and can cause misfires and jerking, usually soon after a fill-up. If the problem started right after refueling, try running the tank low and refilling with fresh fuel from a busy station. Persistent jerking needs a proper diagnosis. ### Can I fix a car that jerks when accelerating myself? Sometimes. Reading codes, replacing spark plugs, swapping a suspect coil, replacing the air filter and cleaning the throttle body or MAF sensor are common DIY jobs. Transmission repairs, fuel pumps and engine mounts are harder and often need a lift, special tools or a scan tool for relearning. ## Sources - [EPA: On-Board Diagnostics (OBD)](https://www.epa.gov/state-and-local-transportation/vehicle-emissions-board-diagnostics-obd) - [Car Care Council: Car care guide](https://www.carcare.org/car-care-guide/) - [AAA: Approved Auto Repair](https://www.aaa.com/autorepair/) ## Other car problems - [Why is blue smoke coming from my exhaust?](https://diagxcar.com/symptoms/blue-smoke-from-exhaust) - [Why does my car smell like something is burning?](https://diagxcar.com/symptoms/burning-smell-from-car) - [Why does my car crank but not start?](https://diagxcar.com/symptoms/car-cranks-but-wont-start) - [Why does my car hesitate when I accelerate?](https://diagxcar.com/symptoms/car-hesitates-when-accelerating) - [Why is my car leaking oil?](https://diagxcar.com/symptoms/car-leaking-oil) - [Why does my car lose power when accelerating?](https://diagxcar.com/symptoms/car-loses-power-when-accelerating) - [Why does my car shake at idle?](https://diagxcar.com/symptoms/car-shakes-at-idle) - [Why does my car shake when I accelerate?](https://diagxcar.com/symptoms/car-shakes-when-accelerating) - [Why is my car leaking coolant?](https://diagxcar.com/symptoms/car-leaking-coolant) - [Why is my car heater not working?](https://diagxcar.com/symptoms/car-heater-not-working) ## Repair costs - [Spark plug replacement cost](https://diagxcar.com/cost/spark-plug-replacement): $120-$450 - [Ignition coil replacement cost](https://diagxcar.com/cost/ignition-coil-replacement): $150-$400 - [Transmission fluid change cost](https://diagxcar.com/cost/transmission-fluid-change): $120-$350 - [Fuel pump replacement cost](https://diagxcar.com/cost/fuel-pump-replacement): $450-$1,300 - [Camshaft position sensor replacement cost](https://diagxcar.com/cost/camshaft-position-sensor-replacement) - [Crankshaft position sensor replacement cost](https://diagxcar.com/cost/crankshaft-position-sensor-replacement) ## How long parts last - [How often should you change your spark plugs?](https://diagxcar.com/how-often/change-spark-plugs): 30,000-100,000 miles - [How often should you change your transmission fluid?](https://diagxcar.com/how-often/change-transmission-fluid): 30,000-100,000 miles ## Trouble codes that lead here - [P0308 Cylinder 8 Misfire Detected](https://diagxcar.com/codes/p0308) - [P0717 Input/Turbine Speed Sensor "A" Circuit No Signal](https://diagxcar.com/codes/p0717) - [P0720 Output Shaft Speed Sensor "A" Circuit](https://diagxcar.com/codes/p0720) - [P0732 Gear 2 Incorrect Ratio](https://diagxcar.com/codes/p0732) - [P0750 Shift Solenoid "A"](https://diagxcar.com/codes/p0750) --- Source page: https://diagxcar.com/symptoms/car-jerks-when-accelerating Updated: 2026-11-03 General information, not a substitute for a qualified mechanic.