P1899 code

1999 JEEP CHEROKEE
230,000 MILES • 4.0L • 6 CYL • 4WD • AUTOMATIC
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ANTHONYCOHEN
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  • 1 POST
Had a P1899 and replaced the switch along with repairing wiring at the switch. P1899 stays off for a day but returns the next day after start up. Do you have any suggestions? The NSS is a typical screw in style and works correctly.
Dec 27, 2016 at 2:16 PM
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CARADIODOC
  • CERTIFIED EXPERT
  • 34,306 POSTS
P1899 - Park/neutral position switch stuck in park or in gear.

Please elaborate on "works correctly"? I do not know what or how you tested it, or what the results were. Why did the wiring need to be repaired?
Dec 27, 2016 at 3:14 PM
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CARADIODOC
  • CERTIFIED EXPERT
  • 34,306 POSTS
Also, there are two different transmissions and they use different neutral safety systems. Do you have the older three-terminal neutral safety switch, or the newer "transmission range sensor"? The sensor has a wire harness with an eight-terminal connector.
Dec 27, 2016 at 3:18 PM
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STEVE W.
  • CERTIFIED EXPERT
  • 15,113 POSTS
Check along the wiring harness where it goes up along the trans and firewall, it is common for them to rub through the insulation and send a false signal.
Dec 27, 2016 at 7:26 PM