Code
P0730
GWM
P — Powertrain
- Gearbox incorrectly adjusted
Views:
UK: 1
EN: 2
RU: 8
AI status
Completed
Completed
100%
Causes
- Low or contaminated transmission fluid
- Worn or damaged clutch packs, bands, or planetary gears
- Faulty transmission input/output/speed sensors or wiring
- Shift cable or selector linkage misadjusted or damaged
- Valve body malfunction or failed shift solenoids
- Torque converter lock‑up/torque converter problems
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Incorrect gear displayed or vehicle in wrong gear
- Harsh, delayed, or missing shifts; transmission slipping
- Engine revs not matching vehicle speed (over‑revving/under‑driving)
- Loss of drive or vehicle enters limp/safe mode
- Unusual transmission noises or grinding during shifts
What to check
- Read and record P0730 and any other stored/related DTCs and freeze frame data
- Capture live data: engine RPM, vehicle speed, transmission input/output shaft speeds, commanded gear, actual gear
- Verify transmission fluid level, temperature and condition (smell, color, metal particles) with vehicle at specified temperature and on level surface
- Confirm correct tire size and final drive ratio for vehicle VIN
- Inspect shift cable/linkage for correct adjustment, binding, or play
- Inspect wiring, connectors and grounds for speed sensors, solenoids and TCM
Signal parameters
- Engine RPM (RPM)
- Vehicle Speed Sensor (VSS) — vehicle speed
- Transmission Input Shaft Speed (TIS) / Input Speed Sensor
- Transmission Output Shaft Speed (TOS) / Output Speed Sensor
- Calculated/Measured Gear Ratio (TCM parameter if available)
- TCM Commanded Gear vs Actual Gear
Diagnostic algorithm
- Scan and note codes, freeze‑frame and related DTCs (P0720/P0725/P0731–P0737 etc.). Clear codes then re‑test to confirm repeatability.
- Verify fluid: check level and condition at operating temperature. Top or change fluid and filter if contaminated or low. Use manufacturer specified fluid.
- Confirm tire size and final drive ratio match vehicle specification and records.
- Perform road test while monitoring live data. Compare engine RPM to vehicle speed to calculate actual gear ratio and compare against expected gear ratios for each gear.
- Inspect and adjust shift cable/selector linkage to factory specification; verify park/neutral switch and gear indicator operation.
- Inspect wiring/connectors/grounds for input/output speed sensors and TCM. Backprobe sensors and verify correct signals (frequency or voltage) at speed.
- Test resistance and operation of shift solenoids and valve body components; replace solenoids if out of specification. Consider pressure tests if hydraulic faults suspected.
- If electrical and hydraulic tests pass, perform TCM adaptation/relearn procedure per service manual. Reflash/reprogram TCM if a software update or corruption is suspected.
- If problem persists and mechanical damage is indicated (metal in pan, severe contamination, abnormal pressures), remove oil pan and inspect filter and internals; disassemble transmission for internal inspection/repair as required.
- After repairs, clear codes and road test to confirm correct gear ratios and no recurrence. Document repairs and any TCM updates.
Likely causes
- Shift cable/selector linkage incorrectly adjusted
- Low/contaminated transmission fluid or incorrect fluid type
- Faulty input/output speed sensor or poor connector/ground
- Failed shift solenoid or valve body sticking
- TCM adaptation/learning out of range after service
Fault status
Status
TCM reports gear ratio outside expected range for selected gear. Check transmission fluid, sensors, shift linkage, solenoids/valve body and TCM adaptation/software.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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