Code
P1505
DAEWOO
P — Powertrain
KICK DOWN SWITCH
Views:
UK: 2
EN: 3
RU: 4
AI status
Completed
Completed
100%
Causes
- Failed or intermittent kick down switch (mechanical wear, contamination or internal failure)
- Open, shorted or corroded wiring/connectors in the kick down switch circuit
- Poor electrical connection at the switch or control module (loose pins, corrosion)
- Misadjusted or mechanically binding throttle/kick down linkage
- Faulty ECM or TCM input circuit (less common)
- Aftermarket throttle components or previous repairs that altered switch function
Symptoms
- MIL (Check Engine Light) illuminated
- Transmission fails to downshift under wide open throttle or delayed downshift
- Poor acceleration under heavy load or highway passing
- Transmission may stay in higher gear or hunt between gears
- Possible limp-in or reduced performance mode in some vehicles
What to check
- Read freeze frame and related live data with a scan tool; note conditions when code set
- Visually inspect kick down switch, throttle linkage and wiring harness for damage or corrosion
- Check connector pins for corrosion, bent pins, water intrusion and secure fit
- Backprobe the switch connector and monitor voltage/continuity while operating throttle
- Wiggle test wiring and connectors while observing live data to spot intermittent faults
- Check grounds and power supply to ECM/TCM if input signal is abnormal
Signal parameters
- Switch is binary: expected open/closed states rather than an analog value
- When closed: continuity near 0 ohms between switch terminals (or voltage referenced to ground depending on circuit)
- When open: high resistance (infinite) or voltage opposite to closed state (commonly 0 V vs approx. 5 V or battery depending on design)
- Typical diagnostic behavior: state should change reliably between idle and wide-open throttle
Diagnostic algorithm
- Retrieve all stored codes and freeze frame data; record related transmission and throttle codes.
- Visually inspect the kick down switch, throttle linkage and harness for damage, corrosion or misadjustment.
- With ignition ON (engine OFF) backprobe the switch connector. Verify reference voltage/pull-up and ground presence per vehicle wiring (expect a clean binary signal).
- Operate the throttle while watching the live data or multimeter: confirm the switch changes state cleanly at the expected throttle position.
- Measure continuity of the switch terminals: closed = near 0 Ω, open = very high/infinite. Perform wiggle test on wiring while monitoring.
- If wiring or connector faults found, repair or replace damaged wiring/connector and retest.
- If switch is faulty or shows inconsistent readings, replace the kick down switch and verify operation.
- Clear codes and road test under conditions that previously produced the code to confirm repair.
- If code returns with a good switch and wiring, check ECM/TCM input circuit and grounds; consult wiring diagram and consider module bench or professional diagnosis.
Likely causes
- Damaged switch or internal contact failure
- Broken wire or connector corrosion between switch and control module
- Switch out of position due to misadjusted linkage
- Intermittent contact from vibration or contamination
Fault status
Status
The ECM/TCM stores P1505 when the kick down switch input is out of expected range, does not change state during operation, or is inconsistent with expected throttle behavior. The MIL will be set and related freeze frame data logged to help reproduce the condition.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.0 hours
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