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2000 Dodge Ram P0500-P0505-P1899: Speed Sensor Issues, No Overdrive, ABS and Brake Light On

Model: 2000 Dodge Ram Fault Code: P0500 Posted: 2017-12-28 03:33

I've replaced multiple sensors and components including the intake valve actuator (IAC), transmission relay, governor, and transmission speed sensor. Despite these repairs, the vehicle continues to show codes P0500, P0505, and P1899 — all indicating circuit malfunctions. After each repair, the same error codes reappear. I've thoroughly inspected body grounds, visible wiring harnesses, and all connections related to the transmission. The speed sensor has been replaced but the speedometer still doesn't work, and both ABS and brake lights remain illuminated. Symptoms include getting stuck in 2nd gear, no overdrive engagement, and failure to shift into drive or overdrive. The vehicle otherwise runs fine under normal conditions. I'm at a loss as to what could be causing this persistent issue. Any technical suggestions for diagnosing or resolving these codes would be greatly appreciated.

Related fault codes
P0500P0505P1899
Comments (2)
Anonymous 2017-12-28 07:30

Hi there — can you confirm the exact diagnostic trouble codes (DTCs) you're seeing? Specifically, P0500, P0505, and P1899. Also, what were the previous codes before these appeared? This helps identify patterns or recurring issues.

Anonymous 2018-01-01 01:30

Thanks for the details. Current codes are P0500, P0505, and P1899. Previous codes included IAC, transmission relay, governor, transmission speed sensor — but even after replacing those, the speedometer still doesn't work and ABS/brake lights stay on. After every repair, the vehicle returns to a 'circuit malfunction' error. I've checked all body grounds and visible wiring at the transmission. The truck runs fine otherwise. Any insights or troubleshooting steps for these persistent codes would be very helpful. Happy New Year — thanks for sharing and helping others with their issues, Steve.