my Toyota Camry XV70 (2018-2024) has a knocking sound when accelerating, what’s wrong?

Toyota Camry XV80 (2025-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

701 words

Problem Statement

Learn how to diagnose and fix knocking sound during acceleration in Toyota Camry XV70 (2018-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is parked on a flat surface and the engine is off.
•Disconnect the battery before starting any repairs.
•Allow the engine to cool before working on any components that might be hot.

Symptoms

•Knocking sound when accelerating
•Possible loss of power during acceleration
•Engine vibrations felt in the cabin
•Unusual sounds when shifting gears
•Diminished fuel efficiency

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any engine or transmission-related codes.
2
Inspect the engine mounts for any signs of wear or damage that could cause knocking sounds.
3
Check the transmission fluid level and condition; low or dirty fluid can cause transmission issues.
4
Examine the suspension components (e.g., struts, control arms) for wear or damage that might contribute to noise.
5
Conduct a visual inspection of the exhaust system for loose or damaged parts that could create knocking sounds.
6
Test drive the vehicle under various conditions to replicate the knocking sound and determine if it changes with speed or load.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Jack and jack stands
•Socket set
•Torque wrench
•Inspection mirror

Parts Required

•Engine mounts (if damaged)
•Transmission fluid (if low or dirty)
•Transmission filter (if applicable)
•Suspension components (if worn)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any engine or transmission-related codes.
2
Inspect the engine mounts for any signs of wear or damage that could cause knocking sounds.
3
Check the transmission fluid level and condition; low or dirty fluid can cause transmission issues.
4
Examine the suspension components (e.g., struts, control arms) for wear or damage that might contribute to noise.
5
Conduct a visual inspection of the exhaust system for loose or damaged parts that could create knocking sounds.
6
Test drive the vehicle under various conditions to replicate the knocking sound and determine if it changes with speed or load.

Solution

1. Preparation

Tools Required: OBD-II scanner, jack and jack stands, socket set, torque wrench, inspection mirror.
Ensure the vehicle is parked on a flat surface and the engine is off. Disconnect the battery before starting any repairs.
Allow the engine to cool before working on any components that might be hot.

2. Inspect and Replace Engine Mounts (if necessary)

Lift the Vehicle:
- Use a jack and secure the vehicle with jack stands.
Locate Engine Mounts:
- Identify the location of all engine mounts (usually located at the front, rear, and sides of the engine).
Inspect Mounts:
- Use an inspection mirror to check for cracks, separation, or excessive wear.
Remove Damaged Mounts:
- Remove the bolts securing the damaged engine mount using the socket set.
Install New Mounts:
- Position the new engine mount and secure it with bolts. Torque the bolts to manufacturer specifications (typically around 50-60 ft-lbs but verify in the service manual).
Lower the Vehicle:
- Carefully remove jack stands and lower the vehicle.

3. Check and Replace Transmission Fluid (if necessary)

Check Fluid Level:
- Locate the transmission dipstick, remove it, clean it, and reinsert it to check the fluid level.
Drain Old Fluid:
- If the fluid is low or dirty, use a wrench to remove the drain plug and let the fluid drain into a pan.
Replace Filter (if applicable):
- Remove the transmission pan, replace the filter, and clean the pan.
Add New Fluid:
- Reinstall the pan, torque bolts to specification, and refill the transmission with new fluid through the dipstick tube.
Check for Leaks:
- Start the vehicle and check for leaks around the pan and fittings.

4. Inspect and Replace Suspension Components (if necessary)

Inspect Components:
- Visually inspect struts, control arms, and bushings for any signs of wear or damage.
Replace Worn Parts:
- Use the socket set to remove and replace any worn components. Torque bolts to specifications.
Recheck Alignment:
- After replacing suspension parts, have the vehicle’s alignment checked and adjusted as necessary.