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Home / DTC / P1771 — Gearshift pos. sensor mal

P1771 — Gearshift pos. sensor mal

Detailed page for trouble code P1771.

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Code

P1771

DAEWOO P — Powertrain

Gearshift pos. sensor mal

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

Causes

  • Open or shorted wiring between sensor and transmission/TCM
  • Poor or corroded connector or pin contact at sensor or TCM
  • Failed gearshift position sensor (transmission range sensor / PRNDL)
  • Physical damage, water ingress or contamination of the sensor
  • Mechanical misalignment or binding of the shift linkage/cable
  • Intermittent fault due to vibration or broken wires

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Incorrect or flashing PRNDL/gear indicator on dash
  • Vehicle may not start or starter disabled when transmission not seen in Park/Neutral
  • Transmission stuck in one gear or enters limp/limited mode
  • Unexpected shifting behavior or inability to select gears
  • Intermittent loss of gear signal (symptoms come and go)

What to check

  • Retrieve freeze frame and live data with an OBD-II scan tool and confirm P1771 is present
  • Visually inspect wiring and connectors at the gearshift position sensor and TCM for corrosion, damage, or looseness
  • Check for related codes (PRNDL/TRS or general transmission codes)
  • Verify battery voltage is stable during testing (low voltage can create false codes)
  • Inspect shift linkage/cable and selector for proper movement and adjustment

Signal parameters

  • Reference voltage to sensor typically 5.0 V (key ON) — confirm presence at connector
  • Sensor output voltage varies with gear position (typical range ~0.5–4.5 V depending on design) — distinct voltage levels for P, R, N, D
  • Continuity: sensor signal circuit should not be open; expected continuity to TCM pin (low ohms)
  • No short to battery voltage or ground on signal circuit (
  • When shifting through positions, signal should change and remain steady in each position

Diagnostic algorithm

  1. Connect scan tool, read and record DTCs and live data for gear position/PRNDL values
  2. Verify battery voltage is within specification (12.4–12.8 V with key off, >12 V with key on)
  3. Perform a visual inspection of sensor, connector and harness; repair obvious damage and reseat connectors
  4. With connector disconnected, check for proper reference voltage and ground at the sensor harness (key ON, engine OFF). If missing, trace supply/ground to TCM
  5. Backprobe the sensor signal pin and observe voltage while moving shift lever through all positions — confirm distinct stable voltages for each position. Note any intermittent or no-signal conditions
  6. If voltage levels are correct at harness but not at TCM, check continuity between sensor connector and TCM pin for open or high resistance (repair wiring as needed)
  7. If wiring and connectors are good but signal is incorrect or does not change correctly with shift lever, replace the gearshift position sensor
  8. After repairs, clear codes, perform key cycles and a test drive; verify code does not return and gear indicator/operation is normal
  9. If problem persists after sensor and wiring verified, inspect shift linkage adjustment and TCM input circuits; consider TCM fault after eliminating wiring and sensor issues

Likely causes

  • Corroded/loose connector at the gearshift position sensor
  • Broken or pinched wiring in the harness between sensor and TCM
  • Failed sensor element (internal wear or water damage)
  • Shift cable out of adjustment or jammed linkage

Fault status

⚠️ Status
P1771 — Gearshift position sensor circuit malfunction: invalid or missing gear position signal to transmission control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

P0705 P0707 P0700 P0776
Repair manuals

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Code

P1771

MAZDA P — Powertrain

Throttle Position Sensor Circuit Open To Transmission Control Module

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

Causes

  • Open or shorted wiring between sensor and transmission/TCM
  • Poor or corroded connector or pin contact at sensor or TCM
  • Failed gearshift position sensor (transmission range sensor / PRNDL)
  • Physical damage, water ingress or contamination of the sensor
  • Mechanical misalignment or binding of the shift linkage/cable
  • Intermittent fault due to vibration or broken wires

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Incorrect or flashing PRNDL/gear indicator on dash
  • Vehicle may not start or starter disabled when transmission not seen in Park/Neutral
  • Transmission stuck in one gear or enters limp/limited mode
  • Unexpected shifting behavior or inability to select gears
  • Intermittent loss of gear signal (symptoms come and go)

What to check

  • Retrieve freeze frame and live data with an OBD-II scan tool and confirm P1771 is present
  • Visually inspect wiring and connectors at the gearshift position sensor and TCM for corrosion, damage, or looseness
  • Check for related codes (PRNDL/TRS or general transmission codes)
  • Verify battery voltage is stable during testing (low voltage can create false codes)
  • Inspect shift linkage/cable and selector for proper movement and adjustment

Signal parameters

  • Reference voltage to sensor typically 5.0 V (key ON) — confirm presence at connector
  • Sensor output voltage varies with gear position (typical range ~0.5–4.5 V depending on design) — distinct voltage levels for P, R, N, D
  • Continuity: sensor signal circuit should not be open; expected continuity to TCM pin (low ohms)
  • No short to battery voltage or ground on signal circuit (
  • When shifting through positions, signal should change and remain steady in each position

Diagnostic algorithm

  1. Connect scan tool, read and record DTCs and live data for gear position/PRNDL values
  2. Verify battery voltage is within specification (12.4–12.8 V with key off, >12 V with key on)
  3. Perform a visual inspection of sensor, connector and harness; repair obvious damage and reseat connectors
  4. With connector disconnected, check for proper reference voltage and ground at the sensor harness (key ON, engine OFF). If missing, trace supply/ground to TCM
  5. Backprobe the sensor signal pin and observe voltage while moving shift lever through all positions — confirm distinct stable voltages for each position. Note any intermittent or no-signal conditions
  6. If voltage levels are correct at harness but not at TCM, check continuity between sensor connector and TCM pin for open or high resistance (repair wiring as needed)
  7. If wiring and connectors are good but signal is incorrect or does not change correctly with shift lever, replace the gearshift position sensor
  8. After repairs, clear codes, perform key cycles and a test drive; verify code does not return and gear indicator/operation is normal
  9. If problem persists after sensor and wiring verified, inspect shift linkage adjustment and TCM input circuits; consider TCM fault after eliminating wiring and sensor issues

Likely causes

  • Corroded/loose connector at the gearshift position sensor
  • Broken or pinched wiring in the harness between sensor and TCM
  • Failed sensor element (internal wear or water damage)
  • Shift cable out of adjustment or jammed linkage

Fault status

⚠️ Status
P1771 — Gearshift position sensor circuit malfunction: invalid or missing gear position signal to transmission control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

P0705 P0707 P0700 P0776
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Code

P1771

MITSUBISHI P — Powertrain

Inhibitor switch short

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

Causes

  • Open or shorted wiring between sensor and transmission/TCM
  • Poor or corroded connector or pin contact at sensor or TCM
  • Failed gearshift position sensor (transmission range sensor / PRNDL)
  • Physical damage, water ingress or contamination of the sensor
  • Mechanical misalignment or binding of the shift linkage/cable
  • Intermittent fault due to vibration or broken wires

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Incorrect or flashing PRNDL/gear indicator on dash
  • Vehicle may not start or starter disabled when transmission not seen in Park/Neutral
  • Transmission stuck in one gear or enters limp/limited mode
  • Unexpected shifting behavior or inability to select gears
  • Intermittent loss of gear signal (symptoms come and go)

What to check

  • Retrieve freeze frame and live data with an OBD-II scan tool and confirm P1771 is present
  • Visually inspect wiring and connectors at the gearshift position sensor and TCM for corrosion, damage, or looseness
  • Check for related codes (PRNDL/TRS or general transmission codes)
  • Verify battery voltage is stable during testing (low voltage can create false codes)
  • Inspect shift linkage/cable and selector for proper movement and adjustment

Signal parameters

  • Reference voltage to sensor typically 5.0 V (key ON) — confirm presence at connector
  • Sensor output voltage varies with gear position (typical range ~0.5–4.5 V depending on design) — distinct voltage levels for P, R, N, D
  • Continuity: sensor signal circuit should not be open; expected continuity to TCM pin (low ohms)
  • No short to battery voltage or ground on signal circuit (
  • When shifting through positions, signal should change and remain steady in each position

Diagnostic algorithm

  1. Connect scan tool, read and record DTCs and live data for gear position/PRNDL values
  2. Verify battery voltage is within specification (12.4–12.8 V with key off, >12 V with key on)
  3. Perform a visual inspection of sensor, connector and harness; repair obvious damage and reseat connectors
  4. With connector disconnected, check for proper reference voltage and ground at the sensor harness (key ON, engine OFF). If missing, trace supply/ground to TCM
  5. Backprobe the sensor signal pin and observe voltage while moving shift lever through all positions — confirm distinct stable voltages for each position. Note any intermittent or no-signal conditions
  6. If voltage levels are correct at harness but not at TCM, check continuity between sensor connector and TCM pin for open or high resistance (repair wiring as needed)
  7. If wiring and connectors are good but signal is incorrect or does not change correctly with shift lever, replace the gearshift position sensor
  8. After repairs, clear codes, perform key cycles and a test drive; verify code does not return and gear indicator/operation is normal
  9. If problem persists after sensor and wiring verified, inspect shift linkage adjustment and TCM input circuits; consider TCM fault after eliminating wiring and sensor issues

Likely causes

  • Corroded/loose connector at the gearshift position sensor
  • Broken or pinched wiring in the harness between sensor and TCM
  • Failed sensor element (internal wear or water damage)
  • Shift cable out of adjustment or jammed linkage

Fault status

⚠️ Status
P1771 — Gearshift position sensor circuit malfunction: invalid or missing gear position signal to transmission control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

P0705 P0707 P0700 P0776
406

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MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P1771

RAM P — Powertrain

LR inadequate element voume: LR, 2-4, OD

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

Causes

  • Open or shorted wiring between sensor and transmission/TCM
  • Poor or corroded connector or pin contact at sensor or TCM
  • Failed gearshift position sensor (transmission range sensor / PRNDL)
  • Physical damage, water ingress or contamination of the sensor
  • Mechanical misalignment or binding of the shift linkage/cable
  • Intermittent fault due to vibration or broken wires

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Incorrect or flashing PRNDL/gear indicator on dash
  • Vehicle may not start or starter disabled when transmission not seen in Park/Neutral
  • Transmission stuck in one gear or enters limp/limited mode
  • Unexpected shifting behavior or inability to select gears
  • Intermittent loss of gear signal (symptoms come and go)

What to check

  • Retrieve freeze frame and live data with an OBD-II scan tool and confirm P1771 is present
  • Visually inspect wiring and connectors at the gearshift position sensor and TCM for corrosion, damage, or looseness
  • Check for related codes (PRNDL/TRS or general transmission codes)
  • Verify battery voltage is stable during testing (low voltage can create false codes)
  • Inspect shift linkage/cable and selector for proper movement and adjustment

Signal parameters

  • Reference voltage to sensor typically 5.0 V (key ON) — confirm presence at connector
  • Sensor output voltage varies with gear position (typical range ~0.5–4.5 V depending on design) — distinct voltage levels for P, R, N, D
  • Continuity: sensor signal circuit should not be open; expected continuity to TCM pin (low ohms)
  • No short to battery voltage or ground on signal circuit (
  • When shifting through positions, signal should change and remain steady in each position

Diagnostic algorithm

  1. Connect scan tool, read and record DTCs and live data for gear position/PRNDL values
  2. Verify battery voltage is within specification (12.4–12.8 V with key off, >12 V with key on)
  3. Perform a visual inspection of sensor, connector and harness; repair obvious damage and reseat connectors
  4. With connector disconnected, check for proper reference voltage and ground at the sensor harness (key ON, engine OFF). If missing, trace supply/ground to TCM
  5. Backprobe the sensor signal pin and observe voltage while moving shift lever through all positions — confirm distinct stable voltages for each position. Note any intermittent or no-signal conditions
  6. If voltage levels are correct at harness but not at TCM, check continuity between sensor connector and TCM pin for open or high resistance (repair wiring as needed)
  7. If wiring and connectors are good but signal is incorrect or does not change correctly with shift lever, replace the gearshift position sensor
  8. After repairs, clear codes, perform key cycles and a test drive; verify code does not return and gear indicator/operation is normal
  9. If problem persists after sensor and wiring verified, inspect shift linkage adjustment and TCM input circuits; consider TCM fault after eliminating wiring and sensor issues

Likely causes

  • Corroded/loose connector at the gearshift position sensor
  • Broken or pinched wiring in the harness between sensor and TCM
  • Failed sensor element (internal wear or water damage)
  • Shift cable out of adjustment or jammed linkage

Fault status

⚠️ Status
P1771 — Gearshift position sensor circuit malfunction: invalid or missing gear position signal to transmission control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

P0705 P0707 P0700 P0776
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1771

VOLKSWAGEN P — Powertrain

Load Signal Stuck Off

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

Causes

  • Open or shorted wiring between sensor and transmission/TCM
  • Poor or corroded connector or pin contact at sensor or TCM
  • Failed gearshift position sensor (transmission range sensor / PRNDL)
  • Physical damage, water ingress or contamination of the sensor
  • Mechanical misalignment or binding of the shift linkage/cable
  • Intermittent fault due to vibration or broken wires

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Incorrect or flashing PRNDL/gear indicator on dash
  • Vehicle may not start or starter disabled when transmission not seen in Park/Neutral
  • Transmission stuck in one gear or enters limp/limited mode
  • Unexpected shifting behavior or inability to select gears
  • Intermittent loss of gear signal (symptoms come and go)

What to check

  • Retrieve freeze frame and live data with an OBD-II scan tool and confirm P1771 is present
  • Visually inspect wiring and connectors at the gearshift position sensor and TCM for corrosion, damage, or looseness
  • Check for related codes (PRNDL/TRS or general transmission codes)
  • Verify battery voltage is stable during testing (low voltage can create false codes)
  • Inspect shift linkage/cable and selector for proper movement and adjustment

Signal parameters

  • Reference voltage to sensor typically 5.0 V (key ON) — confirm presence at connector
  • Sensor output voltage varies with gear position (typical range ~0.5–4.5 V depending on design) — distinct voltage levels for P, R, N, D
  • Continuity: sensor signal circuit should not be open; expected continuity to TCM pin (low ohms)
  • No short to battery voltage or ground on signal circuit (
  • When shifting through positions, signal should change and remain steady in each position

Diagnostic algorithm

  1. Connect scan tool, read and record DTCs and live data for gear position/PRNDL values
  2. Verify battery voltage is within specification (12.4–12.8 V with key off, >12 V with key on)
  3. Perform a visual inspection of sensor, connector and harness; repair obvious damage and reseat connectors
  4. With connector disconnected, check for proper reference voltage and ground at the sensor harness (key ON, engine OFF). If missing, trace supply/ground to TCM
  5. Backprobe the sensor signal pin and observe voltage while moving shift lever through all positions — confirm distinct stable voltages for each position. Note any intermittent or no-signal conditions
  6. If voltage levels are correct at harness but not at TCM, check continuity between sensor connector and TCM pin for open or high resistance (repair wiring as needed)
  7. If wiring and connectors are good but signal is incorrect or does not change correctly with shift lever, replace the gearshift position sensor
  8. After repairs, clear codes, perform key cycles and a test drive; verify code does not return and gear indicator/operation is normal
  9. If problem persists after sensor and wiring verified, inspect shift linkage adjustment and TCM input circuits; consider TCM fault after eliminating wiring and sensor issues

Likely causes

  • Corroded/loose connector at the gearshift position sensor
  • Broken or pinched wiring in the harness between sensor and TCM
  • Failed sensor element (internal wear or water damage)
  • Shift cable out of adjustment or jammed linkage

Fault status

⚠️ Status
P1771 — Gearshift position sensor circuit malfunction: invalid or missing gear position signal to transmission control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

P0705 P0707 P0700 P0776
139

Browse 139 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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