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Home / DTC / P1769 — Stop lamp switch

P1769 — Stop lamp switch

Detailed page for trouble code P1769.

34,405codes
59brands
11,914generic
22,491specific
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Code

P1769

MITSUBISHI P — Powertrain

Stop lamp switch

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty stop (brake) lamp switch
  • Stop lamp switch misadjusted or mechanically sticking
  • Corroded/damaged connector at the switch
  • Broken, shorted or open wiring in the stop lamp switch circuit
  • Blown fuse or poor fuse connection for brake lamp/switch circuit
  • Poor ground or chassis connection

Symptoms

  • Brake lights do not illuminate when pedal is pressed or remain on continuously
  • Cruise control may not engage or may not disengage with brake pedal
  • Shift-interlock may prevent moving out of Park on some models
  • MIL (check engine) or fault indicator may be stored
  • ABS/TCS/cruise-related warnings or limp-mode conditions depending on vehicle integration

What to check

  • Visually inspect rear brake lamps (bulbs/LEDs) — confirm they operate when pedal pressed
  • Check fuse(s) for brake lamps and related circuits
  • Inspect the stop lamp switch and its mounting/adjustment at the brake pedal arm
  • Visually inspect wiring and connector for corrosion, bent pins, loose terminals or damage
  • Scan for stored codes and freeze frame data, then clear and attempt to re-create the fault
  • Check for related system faults (cruise, ABS, shift interlock) that use the brake switch signal

Signal parameters

  • General expected behavior (varies by model): one side of switch is battery + (≈12 V), the other side is the signal to the ECU/lamps. The switch toggles the signal between open/ground and battery depending on type.
  • Normally-open type: released = open (OL), depressed = closed ≈0 Ω between terminals and ~battery voltage present at output.
  • Normally-closed type: released = closed, depressed = open — check service manual for correct type on specific model.
  • Measured voltages: with key ON, meter reference to ground should show ~12 V on the supply terminal; switch output should change between ~0 V (or ground) and ~12 V when pedal is operated (or show continuity/open as appropriate).

Diagnostic algorithm

  1. Safety first: park on level surface, engine off when doing hands-on inspection, use wheel chocks and follow shop safety procedures.
  2. Retrieve/record freeze frame and all stored codes with a scan tool. Clear codes, then reproduce by operating the brake pedal and cycling ignition to see if code returns.
  3. Visually inspect brake lamps, fuses and ground points. Replace burned bulbs and repair blown fuses if found, then retest.
  4. Inspect the stop lamp switch mounting and plunger. Verify pedal-to-switch clearance and that the plunger actuates smoothly. Adjust to factory specification if misaligned.
  5. With a multimeter, check for battery voltage at the switch supply terminal (key ON). Operate pedal and observe the output terminal voltage change. Note whether the switch is normally-open or normally-closed for the model.
  6. Perform continuity/resistance test across the switch terminals. When depressed (or released per type) resistance should go to near 0 Ω; when open it should show OL/infinite. Replace switch if readings are out of spec or intermittent.
  7. Back-probe connector and wiggle harness while operating pedal to check for intermittent wiring faults. Repair any damaged wiring, terminals or connectors (replace pigtails, solder/heat-shrink or use proper terminals).
  8. If wiring and switch test good, check the ECU/BCM input for proper voltage/ground reference. Compare to expected signal using a scan tool or oscilloscope where applicable.
  9. After repair or replacement, clear codes and road test to confirm brake-switch operation and that the code does not return. Verify related systems (cruise, shift interlock) operate normally.
  10. If all tests pass but the code returns, consider module input fault — consult factory wiring diagram and consider module diagnostics or replacement by a specialist.

Likely causes

  • Failed stop lamp switch
  • Switch plunger out of adjustment or binding
  • Wiring/connector corrosion or broken wire to switch
  • Blown fuse supplying the switch

Fault status

⚠️ Status
Stop lamp (brake) switch circuit malfunction — signal not within expected range (open, short, intermittent, or incorrect state).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

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406

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Code

P1769

Other P — Powertrain

AG4 Transmission Torque Modulation Fault

Brand: Other
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty stop (brake) lamp switch
  • Stop lamp switch misadjusted or mechanically sticking
  • Corroded/damaged connector at the switch
  • Broken, shorted or open wiring in the stop lamp switch circuit
  • Blown fuse or poor fuse connection for brake lamp/switch circuit
  • Poor ground or chassis connection

Symptoms

  • Brake lights do not illuminate when pedal is pressed or remain on continuously
  • Cruise control may not engage or may not disengage with brake pedal
  • Shift-interlock may prevent moving out of Park on some models
  • MIL (check engine) or fault indicator may be stored
  • ABS/TCS/cruise-related warnings or limp-mode conditions depending on vehicle integration

What to check

  • Visually inspect rear brake lamps (bulbs/LEDs) — confirm they operate when pedal pressed
  • Check fuse(s) for brake lamps and related circuits
  • Inspect the stop lamp switch and its mounting/adjustment at the brake pedal arm
  • Visually inspect wiring and connector for corrosion, bent pins, loose terminals or damage
  • Scan for stored codes and freeze frame data, then clear and attempt to re-create the fault
  • Check for related system faults (cruise, ABS, shift interlock) that use the brake switch signal

Signal parameters

  • General expected behavior (varies by model): one side of switch is battery + (≈12 V), the other side is the signal to the ECU/lamps. The switch toggles the signal between open/ground and battery depending on type.
  • Normally-open type: released = open (OL), depressed = closed ≈0 Ω between terminals and ~battery voltage present at output.
  • Normally-closed type: released = closed, depressed = open — check service manual for correct type on specific model.
  • Measured voltages: with key ON, meter reference to ground should show ~12 V on the supply terminal; switch output should change between ~0 V (or ground) and ~12 V when pedal is operated (or show continuity/open as appropriate).

Diagnostic algorithm

  1. Safety first: park on level surface, engine off when doing hands-on inspection, use wheel chocks and follow shop safety procedures.
  2. Retrieve/record freeze frame and all stored codes with a scan tool. Clear codes, then reproduce by operating the brake pedal and cycling ignition to see if code returns.
  3. Visually inspect brake lamps, fuses and ground points. Replace burned bulbs and repair blown fuses if found, then retest.
  4. Inspect the stop lamp switch mounting and plunger. Verify pedal-to-switch clearance and that the plunger actuates smoothly. Adjust to factory specification if misaligned.
  5. With a multimeter, check for battery voltage at the switch supply terminal (key ON). Operate pedal and observe the output terminal voltage change. Note whether the switch is normally-open or normally-closed for the model.
  6. Perform continuity/resistance test across the switch terminals. When depressed (or released per type) resistance should go to near 0 Ω; when open it should show OL/infinite. Replace switch if readings are out of spec or intermittent.
  7. Back-probe connector and wiggle harness while operating pedal to check for intermittent wiring faults. Repair any damaged wiring, terminals or connectors (replace pigtails, solder/heat-shrink or use proper terminals).
  8. If wiring and switch test good, check the ECU/BCM input for proper voltage/ground reference. Compare to expected signal using a scan tool or oscilloscope where applicable.
  9. After repair or replacement, clear codes and road test to confirm brake-switch operation and that the code does not return. Verify related systems (cruise, shift interlock) operate normally.
  10. If all tests pass but the code returns, consider module input fault — consult factory wiring diagram and consider module diagnostics or replacement by a specialist.

Likely causes

  • Failed stop lamp switch
  • Switch plunger out of adjustment or binding
  • Wiring/connector corrosion or broken wire to switch
  • Blown fuse supplying the switch

Fault status

⚠️ Status
Stop lamp (brake) switch circuit malfunction — signal not within expected range (open, short, intermittent, or incorrect state).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

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Code

P1769

VOLKSWAGEN P — Powertrain

Hydraulic Pressure Sensor 2 Too Low

Brand: VOLKSWAGEN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty stop (brake) lamp switch
  • Stop lamp switch misadjusted or mechanically sticking
  • Corroded/damaged connector at the switch
  • Broken, shorted or open wiring in the stop lamp switch circuit
  • Blown fuse or poor fuse connection for brake lamp/switch circuit
  • Poor ground or chassis connection

Symptoms

  • Brake lights do not illuminate when pedal is pressed or remain on continuously
  • Cruise control may not engage or may not disengage with brake pedal
  • Shift-interlock may prevent moving out of Park on some models
  • MIL (check engine) or fault indicator may be stored
  • ABS/TCS/cruise-related warnings or limp-mode conditions depending on vehicle integration

What to check

  • Visually inspect rear brake lamps (bulbs/LEDs) — confirm they operate when pedal pressed
  • Check fuse(s) for brake lamps and related circuits
  • Inspect the stop lamp switch and its mounting/adjustment at the brake pedal arm
  • Visually inspect wiring and connector for corrosion, bent pins, loose terminals or damage
  • Scan for stored codes and freeze frame data, then clear and attempt to re-create the fault
  • Check for related system faults (cruise, ABS, shift interlock) that use the brake switch signal

Signal parameters

  • General expected behavior (varies by model): one side of switch is battery + (≈12 V), the other side is the signal to the ECU/lamps. The switch toggles the signal between open/ground and battery depending on type.
  • Normally-open type: released = open (OL), depressed = closed ≈0 Ω between terminals and ~battery voltage present at output.
  • Normally-closed type: released = closed, depressed = open — check service manual for correct type on specific model.
  • Measured voltages: with key ON, meter reference to ground should show ~12 V on the supply terminal; switch output should change between ~0 V (or ground) and ~12 V when pedal is operated (or show continuity/open as appropriate).

Diagnostic algorithm

  1. Safety first: park on level surface, engine off when doing hands-on inspection, use wheel chocks and follow shop safety procedures.
  2. Retrieve/record freeze frame and all stored codes with a scan tool. Clear codes, then reproduce by operating the brake pedal and cycling ignition to see if code returns.
  3. Visually inspect brake lamps, fuses and ground points. Replace burned bulbs and repair blown fuses if found, then retest.
  4. Inspect the stop lamp switch mounting and plunger. Verify pedal-to-switch clearance and that the plunger actuates smoothly. Adjust to factory specification if misaligned.
  5. With a multimeter, check for battery voltage at the switch supply terminal (key ON). Operate pedal and observe the output terminal voltage change. Note whether the switch is normally-open or normally-closed for the model.
  6. Perform continuity/resistance test across the switch terminals. When depressed (or released per type) resistance should go to near 0 Ω; when open it should show OL/infinite. Replace switch if readings are out of spec or intermittent.
  7. Back-probe connector and wiggle harness while operating pedal to check for intermittent wiring faults. Repair any damaged wiring, terminals or connectors (replace pigtails, solder/heat-shrink or use proper terminals).
  8. If wiring and switch test good, check the ECU/BCM input for proper voltage/ground reference. Compare to expected signal using a scan tool or oscilloscope where applicable.
  9. After repair or replacement, clear codes and road test to confirm brake-switch operation and that the code does not return. Verify related systems (cruise, shift interlock) operate normally.
  10. If all tests pass but the code returns, consider module input fault — consult factory wiring diagram and consider module diagnostics or replacement by a specialist.

Likely causes

  • Failed stop lamp switch
  • Switch plunger out of adjustment or binding
  • Wiring/connector corrosion or broken wire to switch
  • Blown fuse supplying the switch

Fault status

⚠️ Status
Stop lamp (brake) switch circuit malfunction — signal not within expected range (open, short, intermittent, or incorrect state).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

Similar codes

P0571 P0572 P0573 P0578 P0705
626

Browse 626 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

VOLKSWAGEN

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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