Code
P0735
GWM
P — Powertrain
- 5 gear is not adjusted correctly
AI status
Completed
Completed
100%
Causes
- Low or dirty transmission fluid
- Worn or damaged 5th gear clutch pack or band
- Faulty shift solenoid(s) controlling 5th gear
- Damaged or misadjusted manual valve / linkage (mechanical or cable shift)
- Faulty input (turbine) or output (output shaft) speed sensor
- Internal transmission wear or broken gear components
Symptoms
- Check Engine/Transmission warning lamp illuminated
- Transmission slips, harsh engagement, or no engagement in 5th gear
- Incorrect road speed vs engine speed (high RPM for speed)
- Transmission enters limp/failed-safe mode
- Delayed or harsh upshift into 5th gear
- Noise or vibration when attempting 5th gear
What to check
- Read and record freeze frame and stored transmission/PIDs with scan tool
- Check transmission fluid level, condition and color (burnt smell, metal particles)
- Clear codes and attempt re-test to see if code returns
- Scan TCM for related codes (speed sensors, solenoids, pressure)
- Inspect wiring/connectors to speed sensors and shift solenoids for damage or corrosion
- Compare engine RPM, input (turbine) speed and output speed PIDs during shift to 5th
Signal parameters
- Engine RPM
- Transmission input (turbine) speed sensor (TP/Turbine RPM)
- Transmission output shaft speed sensor (Vehicle speed/Output RPM)
- Calculated gear ratio or inferred gear
- Shift solenoid status (ON/OFF) for solenoids controlling 5th
- Line/shift apply pressure (if pressure PID available)
Diagnostic algorithm
- Retrieve all stored codes and freeze frame data. Note related codes (speed sensors, solenoids, pressure faults).
- Visually inspect transmission fluid level and condition; top or replace with manufacturer-recommended fluid if low/contaminated.
- Road test with a capable scan tool connected. Observe input vs output speeds and commanded gear during upshift to 5th. Record when ratio deviates from expected.
- If speed sensors show implausible values, inspect and test sensor operation and wiring; replace faulty sensor if needed.
- Activate the shift solenoids with bi-directional control on the scan tool. Verify correct solenoid response and current draw. Compare to spec.
- Check TCM inputs/outputs and associated power/ground circuits. Repair any wiring or connector faults.
- If solenoids and sensors are good but ratio fault persists, check line/shift apply pressure (pressure gauge or pressure PID). Low pressure indicates internal wear or hydraulic faults.
- If hydraulic pressure and solenoids are within spec, suspect internal mechanical wear: clutch pack, band, drum, or gear damage. Remove transmission for internal inspection and repair as required.
- After repairs, clear codes and perform a full re-learn/adaptation procedure if required by the manufacturer, then road test to confirm code does not return.
- If intermittent or no fault found, check for TCM software updates or consider TCM reflash/replacement per service information.
Likely causes
- Low fluid level or degraded fluid preventing proper clutch apply
- Faulty shift solenoid(s) or solenoid circuit for 5th gear
- Worn clutch pack or drum specific to 5th gear
- Faulty or contaminated speed sensor or damaged harness
Fault status
Status
P0735 - Incorrect Gear Ratio Detected (5th gear). Check fluid, speed sensors, shift solenoids, wiring, and internal transmission components.
Repair difficulty: Medium
Diagnostic time: 1.5 - 4.0 hours
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