1. Transmission Fluid:
* Level: Check the transmission fluid level. The Accord likely has a dipstick (check your owner's manual for location and proper checking procedure – engine needs to be running and warmed up for accurate reading on some models). Low fluid is a major culprit. If low, you'll need to add the correct type of Honda transmission fluid (consult your owner's manual). Do not overfill.
* Condition: If the fluid is dark, burnt, or smells burnt, it indicates a problem requiring a transmission flush or possibly a more serious repair.
2. Shift Linkage:
* Adjustment: The shift linkage might be out of adjustment. This is less common but could prevent the transmission from fully engaging. A mechanic can check and adjust this if necessary.
* Damage: Check for any obvious damage or wear to the linkage components.
3. Transmission Issues:
* Internal Problems: This is the most serious possibility. Problems within the transmission itself (worn clutches, low pressure, etc.) can prevent it from engaging. This will require professional diagnosis and likely repair or replacement. Symptoms might include slipping gears, hard shifting, or unusual noises.
4. Electrical Problems:
* Shift Solenoids: These electrical components control the shifting mechanism. A malfunctioning solenoid can prevent the transmission from shifting into drive. This usually requires a diagnostic scan by a mechanic.
* Wiring: Check for any loose, damaged, or corroded wiring related to the transmission.
5. Other Possibilities:
* Park Brake: Make absolutely sure the parking brake is fully released.
* Neutral Safety Switch: This switch prevents the car from starting unless it's in Park or Neutral. A faulty switch could prevent the car from going into drive.
What to Do:
If the transmission fluid is low or looks bad, add the correct fluid (after checking your owner's manual) and see if that solves the problem. However, if the problem persists or if the fluid is severely contaminated, you should take your 1999 Honda Accord to a qualified mechanic immediately. Ignoring transmission problems can lead to significant and costly repairs later. A mechanic will be able to diagnose the issue accurately and recommend the best course of action.
