Transmission Control Switch Circuit is Out of Self-Test Range
Table of contents
P1780 MERCURY Possible Causes
- Transmission Control Switch (TCS) not cycled during the self-test
- Faulty Transmission Control Switch
- Transmission Control Switch harness is open or shorted
- Transmission Control Switch circuit poor electrical connection
How do I fix code P1780 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1780 MERCURY code
The cost of diagnosing the P1780 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1780 MERCURY Description
The Transmission Control Switch (TCS) is a momentary contact switch that is located on the end of the transmission control selector lever. Pushing the TCS will either disengage or engage the overdrive function of the transmission. During Key ON Engine Running (KOER) self-test the TCS must be cycled, the Diagnostic Trouble Code (DTC) will set anytime Powertrain Control Module (PCM) detects a TCS out of self-test range.