Code
P1710
FIAT
P — Powertrain
Brake switch fault
Views:
UK: 2
EN: 5
RU: 2
AI status
Completed
Completed
100%
Causes
- Failed or worn brake light / brake pedal position switch
- Switch misadjusted or mechanically sticking
- Damaged, corroded or loose connector at the switch
- Chafed or shorted wiring between switch and control module
- Poor ground or battery supply to the circuit
- Intermittent wiring fault (broken wire, intermittent connector)
Symptoms
- Brake lights do not illuminate or operate intermittently
- Cruise control inoperative or immediately disengages
- Shift‑interlock (cannot shift out of Park) or related transmission behaviour
- ABS/ESP or other warning lights may illuminate depending on system
- DTC P1710 (and possibly related codes) stored in module
- Possible abnormal idle or engine start behavior on some vehicles
What to check
- Scan for P1710 and any additional related codes; note freeze‑frame and live data
- Visually inspect brake switch mounting, plunger, and adjustment
- Operate brake pedal and verify brake light operation (have helper or use reflection)
- Inspect connector and wiring for corrosion, damage, loose pins, or water intrusion
- Wiggle harness and connector while monitoring live data or brake lights for intermittent faults
- Check fuses and relevant grounds for the body/control modules
Signal parameters
- Switch is a binary input: expected to change state when pedal is depressed vs released
- Signal typically toggles between battery voltage (~12 V) and ~0 V (ground) or a logical high/low referenced to vehicle supply — verify exact behavior from vehicle wiring diagram
- When the switch is closed (activated) continuity to ground or a low resistance is expected; when open the circuit may show high resistance or open circuit
- Connector pin voltages should be steady (no rapid noise) and switch state should change cleanly when pedal is pressed and released
Diagnostic algorithm
- Read and record all stored codes and live data; clear codes and attempt to recreate the fault to verify persistence.
- Perform a visual inspection of the brake light switch, bracket and pedal for mechanical binding or misadjustment. Verify switch plunger contacts pedal arm correctly.
- Check that brake lights operate whenever the pedal is pressed. If lights fail, inspect bulbs and lamp circuits first.
- With ignition on, monitor the brake switch input on a scan tool or multimeter. Observe the signal when pedal is pressed and released; note if it changes state reliably.
- Measure continuity and resistance across the switch (engine off, battery disconnected if required). Replace if out of specification or intermittent.
- Inspect and backprobe the connector for proper supply voltage and signal return. Check for corrosion, bent pins, or water entry.
- Follow the wiring from switch to module: check continuity to the receiving module pin and inspect for chafed areas or pinched sections.
- Repair any damaged wiring, clean or replace connectors, and secure switch mounting/adjustment. Replace the brake switch if tests indicate failure.
- After repairs, clear codes and retest under normal operating conditions. Verify related systems (cruise, shift interlock, ABS) function correctly.
- If wiring and switch check good but fault returns, consider module input diagnostics or reprogram/check software updates/TSBs with dealer-level tools.
Likely causes
- Brake light / pedal switch failure or misadjustment
- Corroded/loose connector at the switch
- Damaged wiring harness (pinched or chafed wire)
- Intermittent connector/terminal causing open or short
Fault status
Status
Brake switch circuit fault detected — invalid, missing or inconsistent brake pedal input.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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