Code
P0734
Generic
P — Powertrain
Gear 4 Incorrect Ratio
Views:
UK: 22
EN: 19
RU: 19
AI status
Completed
Completed
100%
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
- Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
- Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
- Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
- Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
- Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
- Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
- If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
- If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
- Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
- If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
- 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
Views:
UK: 1
EN: 3
RU: 1
AI status
Completed
Completed
100%
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
- Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
- Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
- Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
- Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
- Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
- Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
- If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
- If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
- Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
- If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
- 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
Your experience will help others
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Code
P0734
HUMMER
P — Powertrain
Incorrect 4th Gear Ratio
Views:
UK: 9
EN: 8
RU: 11
AI status
Completed
Completed
100%
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
- Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
- Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
- Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
- Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
- Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
- Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
- If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
- If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
- Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
- If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P0734
LAND ROVER
P — Powertrain
Incorrect gear ratio 4
Views:
UK: 5
EN: 8
RU: 8
AI status
Completed
Completed
100%
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
- Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
- Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
- Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
- Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
- Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
- Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
- If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
- If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
- Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
- If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P0734
MERCEDES-BENZ
P — Powertrain
Gear 4 Incorrect ratio
Views:
UK: 13
EN: 13
RU: 15
AI status
Completed
Completed
100%
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
- Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
- Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
- Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
- Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
- Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
- Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
- If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
- If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
- Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
- If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P0734
MITSUBISHI
P — Powertrain
Gear shift 4th incomplete
Views:
UK: 8
EN: 5
RU: 10
AI status
Completed
Completed
100%
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
- Read and record all stored/active codes and freeze frame data with a capable scan tool; clear codes and re-test if necessary
- Compare commanded gear vs actual gear in live data; select 4th gear with scan tool if possible and monitor inputs
- Road test in a safe area: accelerate to engage 4th and record engine rpm, vehicle speed, calculated and target ratios
- Check transmission fluid level, condition and smell; top up or replace if low/contaminated and re-test (use manufacturer fluid type)
- Inspect and back-probe solenoid connectors; check for proper supply voltage, ground and control pulses from TCM while shifting
- Perform continuity/resistance checks on solenoid coils and wiring to TCM; repair any open/short/intermittent circuits
- If solenoid electrical tests are good, command solenoids ON/OFF with a scan tool and observe shift behavior and ratio change
- If pressure measurement tools are available, check line and apply pressures to verify hydraulic apply of 4th-gear elements
- Remove pan/filter for inspection of debris and magnet for clutch material—excessive metal suggests internal wear
- If mechanical wear suspected after above steps, consider valve body inspection, solenoid replacement, or transmission overhaul/rebuild
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email