Code
P0736
GWM
P — Powertrain
- Rear gear incorrectly adjusted
AI status
Completed
Completed
100%
Causes
- Low or degraded automatic transmission fluid (ATF) level or quality
- Faulty/stuck shift solenoid for 6th gear or related solenoids
- Valve body hydraulic issue (blocked port, worn spool)
- Worn or damaged 6th gear clutch pack or planetary gearset components
- Mechanical damage in the transmission (gear teeth, bearings, final drive)
- Incorrect final drive or rear gear setup/adjustment after service
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- No engagement of 6th gear or transmission skips to a different gear
- RPMs higher or lower than expected at cruising speed (incorrect ratio)
- Hesitation, harsh or delayed shift into top gear
- Transmission may go into limp/backup mode
- Reduced fuel economy at highway speeds
What to check
- Read and record all stored transmission-related DTCs and freeze frame data
- Confirm vehicle test conditions (tire size, final drive ratio, load) match vehicle specification
- Visual inspection of ATF level and condition (color, odor, contamination)
- Road test to reproduce fault and note at what speeds/conditions P0736 sets
- Capture live data: engine RPM, transmission input and output speeds, commanded gear and actual gear
- Compare calculated gear ratio (engine RPM/vehicle speed or input/output speed) to expected specification for 6th gear
Signal parameters
- Engine RPM (rpm)
- Transmission input speed or turbine speed (rpm)
- Transmission output speed or vehicle speed sensor (kph or mph, or rpm)
- Calculated gear ratio (input speed ÷ output speed) vs expected ratio for 6th gear
- TCM commanded gear and TCM actual / gear state
- Shift solenoid command (ON/OFF or duty cycle) and measured solenoid current/voltage
Diagnostic algorithm
- Retrieve P0736 and any related codes (P07xx family, speed sensor, solenoid codes). Record freeze frame and clear codes; attempt to reproduce.
- Verify vehicle configuration: correct tire size, final drive ratio and that recent service did not change rear gear adjustment.
- Check ATF level/condition; if low or contaminated, top/replace ATF per manufacturer spec and retest.
- Perform a road test while monitoring live data (engine rpm, input/output speeds, commanded gear). Note actual ratio in 6th gear and compare to specification.
- Inspect wiring/connectors for speed sensors, solenoids, and TCM. Repair any damage and retest.
- Test shift solenoid(s): measure resistance, perform active tests (command solenoid) and observe response in live data.
- If electrical and solenoid operation are good, check valve body and line pressure (specialty tools may be required). Low line pressure or incorrect valve operation can prevent proper clutch engagement.
- If hydraulic pressures and valve body check OK, suspect internal clutch pack or gearset wear/damage — remove transmission for internal inspection/rebuild or replace as required.
- Check for TCM software updates and perform adaptation/relearn procedures after repairs; clear codes and verify repair by road test.
- If manufacturer-specific rear gear adjustment procedure exists (GWM), follow factory service manual for correct adjustment and torque specifications before final verification.
Likely causes
- Low ATF level or fluid contaminated causing inadequate pressure to engage 6th gear
- Shift solenoid for 6th gear electrical failure or intermittent operation
- Valve body spool or bore wear causing loss of hydraulic control for 6th clutch
- Worn 6th clutch pack or plates producing slippage under load
- Wrong final drive toothing or backlash after differential/service adjustment
- Bad output speed sensor or input speed sensor providing incorrect speed signals to TCM
Fault status
Status
TCM detected actual gear ratio out of range for 6th gear — fault stored (manufacturer note: reported as rear gear incorrectly adjusted). MIL illuminated; vehicle may not engage or maintain 6th gear reliably.
Repair difficulty: Hard
Diagnostic time: 2-6 hours
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