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How to Solve the Flashing D Gear in Automatic Transmission?

3 Answers

GideonMarie

07/29/25 9:23am

Automatic transmission D gear flashing is mostly caused by aging wiring. Below are the reasons for D gear flashing and their solutions: 1. Aging or damaged wiring: Solution: Open the engine compartment and check if the wiring is aged or damaged. 2. Gear shift switch issue: D gear flashing could be due to the gear shift switch not being properly installed. Solution: Try shifting into all gears to see if they engage normally. 3. Transmission or battery problem: Issues with the transmission or battery can also cause the D gear to flash. Solution: Check the transmission and battery for any problems and repair them promptly. 4. Contact point issue: The gear copper contacts may have excessive grease causing poor contact. Solution: Remove the gear shift switch, disassemble it, inspect the copper contacts inside, clean off the grease, and reassemble the gear shift switch to its original position.

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Steven

08/12/25 9:37am

A couple of days ago, the D gear indicator light on my car kept flashing, which scared me into rushing to the repair shop. The mechanic said it was most likely a transmission issue, possibly due to insufficient oil or contaminants, and that the transmission fluid needed to be checked first. If the oil was black or had a burnt smell, it would have to be replaced immediately. There could also be a problem with the transmission control module—loose connectors or water ingress might cause signal abnormalities. I remember he especially emphasized not to continue driving, as it could easily ruin the transmission, and to quickly find a professional shop to read the fault codes with a computer. In my case, it turned out to be a sensor replacement, which cost me nearly a thousand bucks.

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LandonFitz

10/06/25 5:21am

Don't ignore a flashing D gear indicator. Last time I delayed for a few days and ended up with a seized transmission mid-drive. Key checks: transmission fluid level - pull the dipstick when cold, must be within normal range. Fluid color and odor matter too - if it's black with metal particles, complete replacement is needed. For electronic systems, it could be unstable signals from the gear position switch or control module, requiring inspection of wiring connections. My advice: first scan for trouble codes with a diagnostic tool before taking action to avoid unnecessary expenses. After repair, maintain oil change intervals within 30,000 km to prevent such issues.

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