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Home / DTC / P0734 — Gear 4 Incorrect Ratio

P0734 — Gear 4 Incorrect Ratio

Detailed page for trouble code P0734.

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22,491specific
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P0734

Generic P — Powertrain

Gear 4 Incorrect Ratio

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

Causes

  • Low or contaminated transmission fluid
  • Failed or sticking shift solenoid(s) for fourth gear
  • Worn or damaged clutch pack, band or planetary gear set for 4th gear
  • Faulty input/turbine or output/vehicle speed sensor
  • Valve body or hydraulic circuit blockage/failure
  • Wiring/connectors between sensors/solenoids and TCM damaged or corroded

Symptoms

  • Check Engine Light / MIL illuminated
  • Transmission may go into limp/home mode (limited gears)
  • Incorrect engine RPM for vehicle speed when gearbox indicates 4th gear (high or low RPM)
  • Harsh, delayed or slipping shifts into or out of 4th gear
  • Reduced fuel economy or poor acceleration
  • Transmission slipping or inability to hold 4th gear

What to check

  • Retrieve freeze frame and stored codes with a scan tool; note related transmission or speed sensor codes
  • Confirm vehicle is actually in 4th gear using scan tool (TCM commanded vs actual gear)
  • Visually inspect transmission fluid level, color and smell; look for metallic particles in pan/filter
  • Inspect wiring harness and connectors for shift solenoids and speed sensors for damage/corrosion
  • Compare actual vs target gear ratio from live data while road testing in a safe area
  • Check for additional mechanical codes (e.g., speed sensor faults, pressure faults)

Signal parameters

  • Engine speed (rpm) — should correlate with vehicle speed when in 4th
  • Output/vehicle speed sensor (VSS) — used to calculate gear ratio
  • Input/turbine speed or transmission input RPM (if available)
  • Calculated gear ratio (TCM live data) — ratio = input rpm / output rpm (or supplied by TCM)
  • Target/desired gear ratio (TCM live data) — expected ratio for 4th gear
  • Shift solenoid status (on/off) for relevant solenoids

Diagnostic algorithm

  1. Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
  2. Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
  3. Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
  4. Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
  5. Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
  6. Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
  7. If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
  8. If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
  9. Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
  10. If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
  11. If wiring, solenoids and hydraulics are good, verify TCM software/calibration and consider reflashing or replacement only after confirming all other causes ruled out

Likely causes

  • Low fluid level or fluid degraded causing reduced line pressure
  • Shift solenoid for 4th gear stuck open or shorted
  • Worn 4th-gear clutch pack or band causing slip under load
  • Faulty output speed sensor (OSS) giving incorrect vehicle speed signal
  • Valve body spool stuck or bore scored, preventing proper apply of 4th-gear clutches
  • Connector corrosion or intermittent wiring at solenoid harness

Fault status

⚠️ Status
TCM detected incorrect gear ratio in 4th gear — actual ratio differs from expected. Inspect transmission sensors, solenoids, fluid and mechanical components.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours
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Code

P0734

GWM P — Powertrain

- 4 gear is not adjusted correctly

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

Causes

  • Low or contaminated transmission fluid
  • Failed or sticking shift solenoid(s) for fourth gear
  • Worn or damaged clutch pack, band or planetary gear set for 4th gear
  • Faulty input/turbine or output/vehicle speed sensor
  • Valve body or hydraulic circuit blockage/failure
  • Wiring/connectors between sensors/solenoids and TCM damaged or corroded

Symptoms

  • Check Engine Light / MIL illuminated
  • Transmission may go into limp/home mode (limited gears)
  • Incorrect engine RPM for vehicle speed when gearbox indicates 4th gear (high or low RPM)
  • Harsh, delayed or slipping shifts into or out of 4th gear
  • Reduced fuel economy or poor acceleration
  • Transmission slipping or inability to hold 4th gear

What to check

  • Retrieve freeze frame and stored codes with a scan tool; note related transmission or speed sensor codes
  • Confirm vehicle is actually in 4th gear using scan tool (TCM commanded vs actual gear)
  • Visually inspect transmission fluid level, color and smell; look for metallic particles in pan/filter
  • Inspect wiring harness and connectors for shift solenoids and speed sensors for damage/corrosion
  • Compare actual vs target gear ratio from live data while road testing in a safe area
  • Check for additional mechanical codes (e.g., speed sensor faults, pressure faults)

Signal parameters

  • Engine speed (rpm) — should correlate with vehicle speed when in 4th
  • Output/vehicle speed sensor (VSS) — used to calculate gear ratio
  • Input/turbine speed or transmission input RPM (if available)
  • Calculated gear ratio (TCM live data) — ratio = input rpm / output rpm (or supplied by TCM)
  • Target/desired gear ratio (TCM live data) — expected ratio for 4th gear
  • Shift solenoid status (on/off) for relevant solenoids

Diagnostic algorithm

  1. Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
  2. Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
  3. Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
  4. Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
  5. Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
  6. Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
  7. If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
  8. If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
  9. Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
  10. If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
  11. If wiring, solenoids and hydraulics are good, verify TCM software/calibration and consider reflashing or replacement only after confirming all other causes ruled out

Likely causes

  • Low fluid level or fluid degraded causing reduced line pressure
  • Shift solenoid for 4th gear stuck open or shorted
  • Worn 4th-gear clutch pack or band causing slip under load
  • Faulty output speed sensor (OSS) giving incorrect vehicle speed signal
  • Valve body spool stuck or bore scored, preventing proper apply of 4th-gear clutches
  • Connector corrosion or intermittent wiring at solenoid harness

Fault status

⚠️ Status
TCM detected incorrect gear ratio in 4th gear — actual ratio differs from expected. Inspect transmission sensors, solenoids, fluid and mechanical components.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours
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Code

P0734

HUMMER P — Powertrain

Incorrect 4th Gear Ratio

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

Causes

  • Low or contaminated transmission fluid
  • Failed or sticking shift solenoid(s) for fourth gear
  • Worn or damaged clutch pack, band or planetary gear set for 4th gear
  • Faulty input/turbine or output/vehicle speed sensor
  • Valve body or hydraulic circuit blockage/failure
  • Wiring/connectors between sensors/solenoids and TCM damaged or corroded

Symptoms

  • Check Engine Light / MIL illuminated
  • Transmission may go into limp/home mode (limited gears)
  • Incorrect engine RPM for vehicle speed when gearbox indicates 4th gear (high or low RPM)
  • Harsh, delayed or slipping shifts into or out of 4th gear
  • Reduced fuel economy or poor acceleration
  • Transmission slipping or inability to hold 4th gear

What to check

  • Retrieve freeze frame and stored codes with a scan tool; note related transmission or speed sensor codes
  • Confirm vehicle is actually in 4th gear using scan tool (TCM commanded vs actual gear)
  • Visually inspect transmission fluid level, color and smell; look for metallic particles in pan/filter
  • Inspect wiring harness and connectors for shift solenoids and speed sensors for damage/corrosion
  • Compare actual vs target gear ratio from live data while road testing in a safe area
  • Check for additional mechanical codes (e.g., speed sensor faults, pressure faults)

Signal parameters

  • Engine speed (rpm) — should correlate with vehicle speed when in 4th
  • Output/vehicle speed sensor (VSS) — used to calculate gear ratio
  • Input/turbine speed or transmission input RPM (if available)
  • Calculated gear ratio (TCM live data) — ratio = input rpm / output rpm (or supplied by TCM)
  • Target/desired gear ratio (TCM live data) — expected ratio for 4th gear
  • Shift solenoid status (on/off) for relevant solenoids

Diagnostic algorithm

  1. Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
  2. Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
  3. Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
  4. Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
  5. Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
  6. Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
  7. If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
  8. If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
  9. Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
  10. If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
  11. If wiring, solenoids and hydraulics are good, verify TCM software/calibration and consider reflashing or replacement only after confirming all other causes ruled out

Likely causes

  • Low fluid level or fluid degraded causing reduced line pressure
  • Shift solenoid for 4th gear stuck open or shorted
  • Worn 4th-gear clutch pack or band causing slip under load
  • Faulty output speed sensor (OSS) giving incorrect vehicle speed signal
  • Valve body spool stuck or bore scored, preventing proper apply of 4th-gear clutches
  • Connector corrosion or intermittent wiring at solenoid harness

Fault status

⚠️ Status
TCM detected incorrect gear ratio in 4th gear — actual ratio differs from expected. Inspect transmission sensors, solenoids, fluid and mechanical components.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours
Repair manuals

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Code

P0734

LAND ROVER P — Powertrain

Incorrect gear ratio 4

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

Causes

  • Low or contaminated transmission fluid
  • Failed or sticking shift solenoid(s) for fourth gear
  • Worn or damaged clutch pack, band or planetary gear set for 4th gear
  • Faulty input/turbine or output/vehicle speed sensor
  • Valve body or hydraulic circuit blockage/failure
  • Wiring/connectors between sensors/solenoids and TCM damaged or corroded

Symptoms

  • Check Engine Light / MIL illuminated
  • Transmission may go into limp/home mode (limited gears)
  • Incorrect engine RPM for vehicle speed when gearbox indicates 4th gear (high or low RPM)
  • Harsh, delayed or slipping shifts into or out of 4th gear
  • Reduced fuel economy or poor acceleration
  • Transmission slipping or inability to hold 4th gear

What to check

  • Retrieve freeze frame and stored codes with a scan tool; note related transmission or speed sensor codes
  • Confirm vehicle is actually in 4th gear using scan tool (TCM commanded vs actual gear)
  • Visually inspect transmission fluid level, color and smell; look for metallic particles in pan/filter
  • Inspect wiring harness and connectors for shift solenoids and speed sensors for damage/corrosion
  • Compare actual vs target gear ratio from live data while road testing in a safe area
  • Check for additional mechanical codes (e.g., speed sensor faults, pressure faults)

Signal parameters

  • Engine speed (rpm) — should correlate with vehicle speed when in 4th
  • Output/vehicle speed sensor (VSS) — used to calculate gear ratio
  • Input/turbine speed or transmission input RPM (if available)
  • Calculated gear ratio (TCM live data) — ratio = input rpm / output rpm (or supplied by TCM)
  • Target/desired gear ratio (TCM live data) — expected ratio for 4th gear
  • Shift solenoid status (on/off) for relevant solenoids

Diagnostic algorithm

  1. Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
  2. Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
  3. Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
  4. Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
  5. Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
  6. Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
  7. If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
  8. If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
  9. Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
  10. If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
  11. If wiring, solenoids and hydraulics are good, verify TCM software/calibration and consider reflashing or replacement only after confirming all other causes ruled out

Likely causes

  • Low fluid level or fluid degraded causing reduced line pressure
  • Shift solenoid for 4th gear stuck open or shorted
  • Worn 4th-gear clutch pack or band causing slip under load
  • Faulty output speed sensor (OSS) giving incorrect vehicle speed signal
  • Valve body spool stuck or bore scored, preventing proper apply of 4th-gear clutches
  • Connector corrosion or intermittent wiring at solenoid harness

Fault status

⚠️ Status
TCM detected incorrect gear ratio in 4th gear — actual ratio differs from expected. Inspect transmission sensors, solenoids, fluid and mechanical components.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours
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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Code

P0734

MERCEDES-BENZ P — Powertrain

Gear 4 Incorrect ratio

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

Causes

  • Low or contaminated transmission fluid
  • Failed or sticking shift solenoid(s) for fourth gear
  • Worn or damaged clutch pack, band or planetary gear set for 4th gear
  • Faulty input/turbine or output/vehicle speed sensor
  • Valve body or hydraulic circuit blockage/failure
  • Wiring/connectors between sensors/solenoids and TCM damaged or corroded

Symptoms

  • Check Engine Light / MIL illuminated
  • Transmission may go into limp/home mode (limited gears)
  • Incorrect engine RPM for vehicle speed when gearbox indicates 4th gear (high or low RPM)
  • Harsh, delayed or slipping shifts into or out of 4th gear
  • Reduced fuel economy or poor acceleration
  • Transmission slipping or inability to hold 4th gear

What to check

  • Retrieve freeze frame and stored codes with a scan tool; note related transmission or speed sensor codes
  • Confirm vehicle is actually in 4th gear using scan tool (TCM commanded vs actual gear)
  • Visually inspect transmission fluid level, color and smell; look for metallic particles in pan/filter
  • Inspect wiring harness and connectors for shift solenoids and speed sensors for damage/corrosion
  • Compare actual vs target gear ratio from live data while road testing in a safe area
  • Check for additional mechanical codes (e.g., speed sensor faults, pressure faults)

Signal parameters

  • Engine speed (rpm) — should correlate with vehicle speed when in 4th
  • Output/vehicle speed sensor (VSS) — used to calculate gear ratio
  • Input/turbine speed or transmission input RPM (if available)
  • Calculated gear ratio (TCM live data) — ratio = input rpm / output rpm (or supplied by TCM)
  • Target/desired gear ratio (TCM live data) — expected ratio for 4th gear
  • Shift solenoid status (on/off) for relevant solenoids

Diagnostic algorithm

  1. Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
  2. Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
  3. Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
  4. Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
  5. Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
  6. Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
  7. If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
  8. If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
  9. Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
  10. If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
  11. If wiring, solenoids and hydraulics are good, verify TCM software/calibration and consider reflashing or replacement only after confirming all other causes ruled out

Likely causes

  • Low fluid level or fluid degraded causing reduced line pressure
  • Shift solenoid for 4th gear stuck open or shorted
  • Worn 4th-gear clutch pack or band causing slip under load
  • Faulty output speed sensor (OSS) giving incorrect vehicle speed signal
  • Valve body spool stuck or bore scored, preventing proper apply of 4th-gear clutches
  • Connector corrosion or intermittent wiring at solenoid harness

Fault status

⚠️ Status
TCM detected incorrect gear ratio in 4th gear — actual ratio differs from expected. Inspect transmission sensors, solenoids, fluid and mechanical components.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours
856

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MERCEDES-BENZ

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Code

P0734

MITSUBISHI P — Powertrain

Gear shift 4th incomplete

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

Causes

  • Low or contaminated transmission fluid
  • Failed or sticking shift solenoid(s) for fourth gear
  • Worn or damaged clutch pack, band or planetary gear set for 4th gear
  • Faulty input/turbine or output/vehicle speed sensor
  • Valve body or hydraulic circuit blockage/failure
  • Wiring/connectors between sensors/solenoids and TCM damaged or corroded

Symptoms

  • Check Engine Light / MIL illuminated
  • Transmission may go into limp/home mode (limited gears)
  • Incorrect engine RPM for vehicle speed when gearbox indicates 4th gear (high or low RPM)
  • Harsh, delayed or slipping shifts into or out of 4th gear
  • Reduced fuel economy or poor acceleration
  • Transmission slipping or inability to hold 4th gear

What to check

  • Retrieve freeze frame and stored codes with a scan tool; note related transmission or speed sensor codes
  • Confirm vehicle is actually in 4th gear using scan tool (TCM commanded vs actual gear)
  • Visually inspect transmission fluid level, color and smell; look for metallic particles in pan/filter
  • Inspect wiring harness and connectors for shift solenoids and speed sensors for damage/corrosion
  • Compare actual vs target gear ratio from live data while road testing in a safe area
  • Check for additional mechanical codes (e.g., speed sensor faults, pressure faults)

Signal parameters

  • Engine speed (rpm) — should correlate with vehicle speed when in 4th
  • Output/vehicle speed sensor (VSS) — used to calculate gear ratio
  • Input/turbine speed or transmission input RPM (if available)
  • Calculated gear ratio (TCM live data) — ratio = input rpm / output rpm (or supplied by TCM)
  • Target/desired gear ratio (TCM live data) — expected ratio for 4th gear
  • Shift solenoid status (on/off) for relevant solenoids

Diagnostic algorithm

  1. Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
  2. Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
  3. Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
  4. Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
  5. Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
  6. Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
  7. If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
  8. If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
  9. Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
  10. If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
  11. If wiring, solenoids and hydraulics are good, verify TCM software/calibration and consider reflashing or replacement only after confirming all other causes ruled out

Likely causes

  • Low fluid level or fluid degraded causing reduced line pressure
  • Shift solenoid for 4th gear stuck open or shorted
  • Worn 4th-gear clutch pack or band causing slip under load
  • Faulty output speed sensor (OSS) giving incorrect vehicle speed signal
  • Valve body spool stuck or bore scored, preventing proper apply of 4th-gear clutches
  • Connector corrosion or intermittent wiring at solenoid harness

Fault status

⚠️ Status
TCM detected incorrect gear ratio in 4th gear — actual ratio differs from expected. Inspect transmission sensors, solenoids, fluid and mechanical components.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Keep it short and practical. Up to 500 characters.
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