What does it mean?
P1710 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: A/T First Hold Switch Circuit Malfunction .
Symptoms
- MIL on with a transmission warning light
- First gear hold function not working, or engaging when it was never selected
- Indicator lamp for the hold function stuck on, or never lighting
- Shift pattern changing unexpectedly during normal driving
- Otherwise normal transmission operation in most cases
- Fault that follows pressing or moving the console switch
Likely causes
- Faulty first hold switch with worn, dirty or intermittent contacts
- Open or shorted wire between the switch and the transmission module
- Corroded connector at the switch or in the centre console harness
- Poor ground for the switch circuit
- Liquid spilled into the console reaching the switch or its connector
- Loose or damaged console harness after interior trim work
- Transmission module input circuit fault
How to fix it
- Operate the switch while watching its state in live data; the value should toggle cleanly each time
- Remove the switch and test its continuity in both positions with a multimeter
- Inspect the console connector for corrosion, spilled liquid and loose or backed-out pins
- Check the circuit between switch and module for open and short to ground conditions
- Voltage drop test the switch ground circuit
- Replace the switch if it does not toggle reliably
- Repair the harness if the circuit is damaged, then clear the code and re-test the function