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Home / DTC / P0780 — Shift Error

P0780 — Shift Error

Detailed page for trouble code P0780.

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22,491specific
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Code

P0780

Generic P — Powertrain

Shift Error

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

Causes

  • Low or contaminated transmission fluid
  • Faulty shift solenoid(s) or solenoid harness/connectors
  • Faulty input/output speed sensor(s)
  • Internal transmission mechanical wear (clutches, bands, planetary gears)
  • Low line pressure or hydraulic leaks
  • Faulty Transmission Control Module (TCM) or software/firmware issue

Symptoms

  • Check Engine or transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or failing to engage expected gear
  • Transmission stuck in one gear or limp/torque‑limited mode
  • Unexpected downshifts or upshifts
  • Reduced drivability and poor acceleration

What to check

  • Read freeze frame data and all current/pending transmission codes with a scan tool
  • Check transmission fluid level, condition and smell (burnt odor)
  • Inspect battery voltage and charging system for stable voltage
  • Visually inspect wiring and connectors at TCM, solenoids and sensors for corrosion or damage
  • Monitor live data: gear commanded vs. gear actual, input/output speeds, solenoid command/status
  • Check for TSBs or software updates for the vehicle/TCM

Signal parameters

  • TCM gear command vs actual gear state (expected discrete/parameter values)
  • Transmission input speed (TIS) and output speed (TOS) — typically pulses 0–5 V or CAN messages
  • Vehicle speed sensor (VSS) — pulses or CAN data consistent with wheel speed
  • Shift solenoid control signal (duty cycle or ON/OFF) and measured coil resistance/current
  • Line pressure (psi) or relative pressure sensor values
  • Battery voltage (approx. 12–14.5 V) and ground continuity

Diagnostic algorithm

  1. Retrieve and record all diagnostic trouble codes, freeze frame and live data with a capable scan tool; note related codes (speed sensors, solenoids, pressure faults).
  2. Verify correct battery voltage and charging system performance. Low voltage can cause erratic TCM behavior.
  3. Check transmission fluid level and condition. Top or replace fluid if low or contaminated; use manufacturer-specified fluid.
  4. Inspect electrical connectors and wiring to the TCM, shift solenoids and speed sensors for corrosion, damage, or loose pins; repair as needed.
  5. With scan tool, command shift solenoids and observe response and current draw; measure solenoid coil resistance against specifications.
  6. Monitor input and output speed sensors during a controlled road test or on a lift; confirm speed ratio matches expected gear ratio. Look for slip (input speed > output speed when engaged).
  7. Perform transmission pressure test (pump/line/clutch pressure) if available to confirm adequate line pressure and no internal leaks.
  8. If electrical and hydraulic systems check OK, consider internal mechanical inspection (clutch packs, bands, planetary) or consult rebuild/replacement options.
  9. Check for and apply any TCM software updates or relearns; clear codes and re-run verification drive to confirm resolution.
  10. If intermittent or unresolved after above steps, consider module replacement only after ruling out wiring, sensors, fluid, solenoids and mechanical faults.

Likely causes

  • Incorrect fluid level or severely degraded fluid
  • Faulty or sticking shift solenoid(s)
  • Faulty vehicle speed or transmission speed sensor
  • Low hydraulic line pressure due to pump or internal leak
  • Corroded/loose electrical connectors to TCM or solenoids

Fault status

⚠️ Status
TCM detected an abnormal shift event (incorrect gear shift, timing, or ratio).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 5.0 hours

Similar codes

P0700 P0730 P0740 P0750 P0781 P0782
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Code

P0780

GWM P — Powertrain

- Switch failure

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

Causes

  • Low or contaminated transmission fluid
  • Faulty shift solenoid(s) or solenoid harness/connectors
  • Faulty input/output speed sensor(s)
  • Internal transmission mechanical wear (clutches, bands, planetary gears)
  • Low line pressure or hydraulic leaks
  • Faulty Transmission Control Module (TCM) or software/firmware issue

Symptoms

  • Check Engine or transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or failing to engage expected gear
  • Transmission stuck in one gear or limp/torque‑limited mode
  • Unexpected downshifts or upshifts
  • Reduced drivability and poor acceleration

What to check

  • Read freeze frame data and all current/pending transmission codes with a scan tool
  • Check transmission fluid level, condition and smell (burnt odor)
  • Inspect battery voltage and charging system for stable voltage
  • Visually inspect wiring and connectors at TCM, solenoids and sensors for corrosion or damage
  • Monitor live data: gear commanded vs. gear actual, input/output speeds, solenoid command/status
  • Check for TSBs or software updates for the vehicle/TCM

Signal parameters

  • TCM gear command vs actual gear state (expected discrete/parameter values)
  • Transmission input speed (TIS) and output speed (TOS) — typically pulses 0–5 V or CAN messages
  • Vehicle speed sensor (VSS) — pulses or CAN data consistent with wheel speed
  • Shift solenoid control signal (duty cycle or ON/OFF) and measured coil resistance/current
  • Line pressure (psi) or relative pressure sensor values
  • Battery voltage (approx. 12–14.5 V) and ground continuity

Diagnostic algorithm

  1. Retrieve and record all diagnostic trouble codes, freeze frame and live data with a capable scan tool; note related codes (speed sensors, solenoids, pressure faults).
  2. Verify correct battery voltage and charging system performance. Low voltage can cause erratic TCM behavior.
  3. Check transmission fluid level and condition. Top or replace fluid if low or contaminated; use manufacturer-specified fluid.
  4. Inspect electrical connectors and wiring to the TCM, shift solenoids and speed sensors for corrosion, damage, or loose pins; repair as needed.
  5. With scan tool, command shift solenoids and observe response and current draw; measure solenoid coil resistance against specifications.
  6. Monitor input and output speed sensors during a controlled road test or on a lift; confirm speed ratio matches expected gear ratio. Look for slip (input speed > output speed when engaged).
  7. Perform transmission pressure test (pump/line/clutch pressure) if available to confirm adequate line pressure and no internal leaks.
  8. If electrical and hydraulic systems check OK, consider internal mechanical inspection (clutch packs, bands, planetary) or consult rebuild/replacement options.
  9. Check for and apply any TCM software updates or relearns; clear codes and re-run verification drive to confirm resolution.
  10. If intermittent or unresolved after above steps, consider module replacement only after ruling out wiring, sensors, fluid, solenoids and mechanical faults.

Likely causes

  • Incorrect fluid level or severely degraded fluid
  • Faulty or sticking shift solenoid(s)
  • Faulty vehicle speed or transmission speed sensor
  • Low hydraulic line pressure due to pump or internal leak
  • Corroded/loose electrical connectors to TCM or solenoids

Fault status

⚠️ Status
TCM detected an abnormal shift event (incorrect gear shift, timing, or ratio).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 5.0 hours

Similar codes

P0700 P0730 P0740 P0750 P0781 P0782
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Code

P0780

HUMMER P — Powertrain

Shift Malfunction

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

Causes

  • Low or contaminated transmission fluid
  • Faulty shift solenoid(s) or solenoid harness/connectors
  • Faulty input/output speed sensor(s)
  • Internal transmission mechanical wear (clutches, bands, planetary gears)
  • Low line pressure or hydraulic leaks
  • Faulty Transmission Control Module (TCM) or software/firmware issue

Symptoms

  • Check Engine or transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or failing to engage expected gear
  • Transmission stuck in one gear or limp/torque‑limited mode
  • Unexpected downshifts or upshifts
  • Reduced drivability and poor acceleration

What to check

  • Read freeze frame data and all current/pending transmission codes with a scan tool
  • Check transmission fluid level, condition and smell (burnt odor)
  • Inspect battery voltage and charging system for stable voltage
  • Visually inspect wiring and connectors at TCM, solenoids and sensors for corrosion or damage
  • Monitor live data: gear commanded vs. gear actual, input/output speeds, solenoid command/status
  • Check for TSBs or software updates for the vehicle/TCM

Signal parameters

  • TCM gear command vs actual gear state (expected discrete/parameter values)
  • Transmission input speed (TIS) and output speed (TOS) — typically pulses 0–5 V or CAN messages
  • Vehicle speed sensor (VSS) — pulses or CAN data consistent with wheel speed
  • Shift solenoid control signal (duty cycle or ON/OFF) and measured coil resistance/current
  • Line pressure (psi) or relative pressure sensor values
  • Battery voltage (approx. 12–14.5 V) and ground continuity

Diagnostic algorithm

  1. Retrieve and record all diagnostic trouble codes, freeze frame and live data with a capable scan tool; note related codes (speed sensors, solenoids, pressure faults).
  2. Verify correct battery voltage and charging system performance. Low voltage can cause erratic TCM behavior.
  3. Check transmission fluid level and condition. Top or replace fluid if low or contaminated; use manufacturer-specified fluid.
  4. Inspect electrical connectors and wiring to the TCM, shift solenoids and speed sensors for corrosion, damage, or loose pins; repair as needed.
  5. With scan tool, command shift solenoids and observe response and current draw; measure solenoid coil resistance against specifications.
  6. Monitor input and output speed sensors during a controlled road test or on a lift; confirm speed ratio matches expected gear ratio. Look for slip (input speed > output speed when engaged).
  7. Perform transmission pressure test (pump/line/clutch pressure) if available to confirm adequate line pressure and no internal leaks.
  8. If electrical and hydraulic systems check OK, consider internal mechanical inspection (clutch packs, bands, planetary) or consult rebuild/replacement options.
  9. Check for and apply any TCM software updates or relearns; clear codes and re-run verification drive to confirm resolution.
  10. If intermittent or unresolved after above steps, consider module replacement only after ruling out wiring, sensors, fluid, solenoids and mechanical faults.

Likely causes

  • Incorrect fluid level or severely degraded fluid
  • Faulty or sticking shift solenoid(s)
  • Faulty vehicle speed or transmission speed sensor
  • Low hydraulic line pressure due to pump or internal leak
  • Corroded/loose electrical connectors to TCM or solenoids

Fault status

⚠️ Status
TCM detected an abnormal shift event (incorrect gear shift, timing, or ratio).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 5.0 hours

Similar codes

P0700 P0730 P0740 P0750 P0781 P0782
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

P0780

LAND ROVER P — Powertrain

Malfunction of the shift

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

Causes

  • Low or contaminated transmission fluid
  • Faulty shift solenoid(s) or solenoid harness/connectors
  • Faulty input/output speed sensor(s)
  • Internal transmission mechanical wear (clutches, bands, planetary gears)
  • Low line pressure or hydraulic leaks
  • Faulty Transmission Control Module (TCM) or software/firmware issue

Symptoms

  • Check Engine or transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or failing to engage expected gear
  • Transmission stuck in one gear or limp/torque‑limited mode
  • Unexpected downshifts or upshifts
  • Reduced drivability and poor acceleration

What to check

  • Read freeze frame data and all current/pending transmission codes with a scan tool
  • Check transmission fluid level, condition and smell (burnt odor)
  • Inspect battery voltage and charging system for stable voltage
  • Visually inspect wiring and connectors at TCM, solenoids and sensors for corrosion or damage
  • Monitor live data: gear commanded vs. gear actual, input/output speeds, solenoid command/status
  • Check for TSBs or software updates for the vehicle/TCM

Signal parameters

  • TCM gear command vs actual gear state (expected discrete/parameter values)
  • Transmission input speed (TIS) and output speed (TOS) — typically pulses 0–5 V or CAN messages
  • Vehicle speed sensor (VSS) — pulses or CAN data consistent with wheel speed
  • Shift solenoid control signal (duty cycle or ON/OFF) and measured coil resistance/current
  • Line pressure (psi) or relative pressure sensor values
  • Battery voltage (approx. 12–14.5 V) and ground continuity

Diagnostic algorithm

  1. Retrieve and record all diagnostic trouble codes, freeze frame and live data with a capable scan tool; note related codes (speed sensors, solenoids, pressure faults).
  2. Verify correct battery voltage and charging system performance. Low voltage can cause erratic TCM behavior.
  3. Check transmission fluid level and condition. Top or replace fluid if low or contaminated; use manufacturer-specified fluid.
  4. Inspect electrical connectors and wiring to the TCM, shift solenoids and speed sensors for corrosion, damage, or loose pins; repair as needed.
  5. With scan tool, command shift solenoids and observe response and current draw; measure solenoid coil resistance against specifications.
  6. Monitor input and output speed sensors during a controlled road test or on a lift; confirm speed ratio matches expected gear ratio. Look for slip (input speed > output speed when engaged).
  7. Perform transmission pressure test (pump/line/clutch pressure) if available to confirm adequate line pressure and no internal leaks.
  8. If electrical and hydraulic systems check OK, consider internal mechanical inspection (clutch packs, bands, planetary) or consult rebuild/replacement options.
  9. Check for and apply any TCM software updates or relearns; clear codes and re-run verification drive to confirm resolution.
  10. If intermittent or unresolved after above steps, consider module replacement only after ruling out wiring, sensors, fluid, solenoids and mechanical faults.

Likely causes

  • Incorrect fluid level or severely degraded fluid
  • Faulty or sticking shift solenoid(s)
  • Faulty vehicle speed or transmission speed sensor
  • Low hydraulic line pressure due to pump or internal leak
  • Corroded/loose electrical connectors to TCM or solenoids

Fault status

⚠️ Status
TCM detected an abnormal shift event (incorrect gear shift, timing, or ratio).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 5.0 hours

Similar codes

P0700 P0730 P0740 P0750 P0781 P0782
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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

P0780

MERCEDES-BENZ P — Powertrain

Shift Malfunction

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Low or contaminated transmission fluid
  • Faulty shift solenoid(s) or solenoid harness/connectors
  • Faulty input/output speed sensor(s)
  • Internal transmission mechanical wear (clutches, bands, planetary gears)
  • Low line pressure or hydraulic leaks
  • Faulty Transmission Control Module (TCM) or software/firmware issue

Symptoms

  • Check Engine or transmission warning light illuminated
  • Harsh, delayed, or erratic shifting
  • Transmission slipping or failing to engage expected gear
  • Transmission stuck in one gear or limp/torque‑limited mode
  • Unexpected downshifts or upshifts
  • Reduced drivability and poor acceleration

What to check

  • Read freeze frame data and all current/pending transmission codes with a scan tool
  • Check transmission fluid level, condition and smell (burnt odor)
  • Inspect battery voltage and charging system for stable voltage
  • Visually inspect wiring and connectors at TCM, solenoids and sensors for corrosion or damage
  • Monitor live data: gear commanded vs. gear actual, input/output speeds, solenoid command/status
  • Check for TSBs or software updates for the vehicle/TCM

Signal parameters

  • TCM gear command vs actual gear state (expected discrete/parameter values)
  • Transmission input speed (TIS) and output speed (TOS) — typically pulses 0–5 V or CAN messages
  • Vehicle speed sensor (VSS) — pulses or CAN data consistent with wheel speed
  • Shift solenoid control signal (duty cycle or ON/OFF) and measured coil resistance/current
  • Line pressure (psi) or relative pressure sensor values
  • Battery voltage (approx. 12–14.5 V) and ground continuity

Diagnostic algorithm

  1. Retrieve and record all diagnostic trouble codes, freeze frame and live data with a capable scan tool; note related codes (speed sensors, solenoids, pressure faults).
  2. Verify correct battery voltage and charging system performance. Low voltage can cause erratic TCM behavior.
  3. Check transmission fluid level and condition. Top or replace fluid if low or contaminated; use manufacturer-specified fluid.
  4. Inspect electrical connectors and wiring to the TCM, shift solenoids and speed sensors for corrosion, damage, or loose pins; repair as needed.
  5. With scan tool, command shift solenoids and observe response and current draw; measure solenoid coil resistance against specifications.
  6. Monitor input and output speed sensors during a controlled road test or on a lift; confirm speed ratio matches expected gear ratio. Look for slip (input speed > output speed when engaged).
  7. Perform transmission pressure test (pump/line/clutch pressure) if available to confirm adequate line pressure and no internal leaks.
  8. If electrical and hydraulic systems check OK, consider internal mechanical inspection (clutch packs, bands, planetary) or consult rebuild/replacement options.
  9. Check for and apply any TCM software updates or relearns; clear codes and re-run verification drive to confirm resolution.
  10. If intermittent or unresolved after above steps, consider module replacement only after ruling out wiring, sensors, fluid, solenoids and mechanical faults.

Likely causes

  • Incorrect fluid level or severely degraded fluid
  • Faulty or sticking shift solenoid(s)
  • Faulty vehicle speed or transmission speed sensor
  • Low hydraulic line pressure due to pump or internal leak
  • Corroded/loose electrical connectors to TCM or solenoids

Fault status

⚠️ Status
TCM detected an abnormal shift event (incorrect gear shift, timing, or ratio).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 5.0 hours

Similar codes

P0700 P0730 P0740 P0750 P0781 P0782
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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

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