Code
P1709
DAEWOO
P — Powertrain
Kick down switch
Views:
UK: 4
EN: 19
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty kick down (kickdown) switch
- Open, shorted or corroded wiring/connectors in the kickdown circuit
- Poor ground or connector contact
- Mechanical binding or misadjustment of throttle/linkage preventing proper switch actuation
- Faulty ECM/TCM or internal input fault
- Aftermarket throttle or linkage modifications affecting switch operation
Symptoms
- Check Engine / MIL lamp illuminated
- Delayed or missing downshift (kickdown) under heavy throttle
- Transmission not downshifting to lower gear when expected
- Harsh or erratic shift behavior under wide-open throttle
- Reduced performance or limp-in mode in some vehicles
What to check
- Read codes and freeze frame data with a scan tool; note conditions when P1709 set
- Visually inspect the kickdown switch, its connector and wiring for damage or corrosion
- Operate throttle while observing switch connector for proper movement / continuity
- Back-probe the switch connector to observe signal with a multimeter or scope
- Check for related transmission or throttle codes that may affect operation
- Wiggle wiring harness while monitoring the signal for intermittent faults
Signal parameters
- Typical: switch is ON (closed) at or near full throttle; OFF (open) at idle — exact actuation point varies by model
- Voltage with ignition ON: open ≈ supply voltage (e.g., ~12 V) or pull-up voltage; closed ≈ near 0 V (ground) depending on circuit design
- Continuity when closed: near 0 Ω; when open: OL (infinite). Exact values depend on vehicle wiring and switch type
- No rapid PWM or frequency expected; signal is usually a simple ON/OFF contact
Diagnostic algorithm
- Verify the DAEWOO P1709 code with an OBD-II scanner and note freeze frame (throttle position, vehicle speed, engine RPM).
- Inspect the kickdown switch location, mounting, and mechanical linkage for damage, contamination, or misadjustment.
- Visually inspect connector pins and wiring for corrosion, bent pins, broken strands or water intrusion; repair as needed.
- With ignition ON (engine off), back-probe the switch connector and observe voltage while operating throttle from idle to wide open. Compare to expected ON/OFF behavior.
- Use a multimeter to check continuity of the switch: closed (throttle at kickdown) should show continuity; open at idle. If intermittent, wiggle the harness while monitoring.
- If signal incorrect at switch, trace wiring to the ECM/TCM and check for opens/shorts to power or ground. Repair any damaged wiring.
- If good signal at the switch but code persists, check for proper ground and power at the ECM/TCM input and inspect module connector pins.
- If wiring and connectors are good, consider replacing the kickdown switch per manufacturer procedure and retest.
- After repair, clear codes, perform functional test/road test under the conditions that previously set the code, and verify no return of the DTC.
Likely causes
- Switch contacts failed (stuck open or intermittent)
- Damaged connector or wiring between switch and transmission control module
- Corroded terminals or poor ground at switch
- Switch not adjusted or mechanically obstructed
- Control module input circuit fault (less likely)
Fault status
Status
Kick down switch circuit malfunction — open/short/intermittent or switch not actuating properly.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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