Car won't accelerate when D or R.


Asked by Aug 08, 2012 at 10:53 AM about the 2002 INFINITI I35 FWD

Question type: Maintenance & Repair

2002 Infiniti I35, 190,000 miles.- Has been running great until late yesterday when I pulled into my driveway and the car wouldn't accelerate.- When the car is in P or N the engine will rev as expected.- When it is one of the Drive or Reverse gears, it moves at idle pace only. When I press the accelerator, the engine won't even rev.

4 Answers


It was the alternator. I bought a new one for $99 on and paid someone $150 to install it.

5 people found this helpful.

already replaced alternator & battery. nothing else shows up on the mechanics diagnostics

1 people found this helpful.

This very thing happen to my 2002 Infiniti I35 as well. Only I was getting a battery symbol warning light on my dash. I knew it was most likely my alternator or my battery. When I got home I tested my battery. It was showing it was low. I put it on my charger over night. The next day it started and drove just fine. I now know my battery is working fine and there a good change my alternator is gone bad. It wasn't until I had to make a 20 minute trip on a rainy night I ran into the problem. I was trying to conserve as much battery juice as possible. I had to drive with my head lights on but I would only use my wipers once in a while and nothing else. About 15 minutes in to my trip I notice a lost of power in the engine. I made my way to the shoulder of the road. The car was still running but only at an idle. The car would not accelerate forward, Only move at an idle speed. I put the car in park and pressed the petal down. To my surprise the engine revved normal. But shift in any gear it would not rev-up. I thought my transmission was going out. Anyway, long story short. Had the car towed home and did some trouble searching. Found out the alternator has a direct link the the transmission. When their is a lost of battery power the transmission can no longer function properly. Again I charged the battery and everything work normally. A bad alternator was my problem (radiator has be be removed). Cost to me was 175.00 for a do-it-yourself job.

1 people found this helpful.

Had same problem. My problem was the plastic tap that's on your break pedal behind the break light switch was broken (keeping the brake lights on, that's how I've noticed). So the ECU read I was breaking while driving, making it go into safe mode and not go faster than 20 mph

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