P0711 on GMC: How to Diagnose & Fix
Transmission Fluid Temperature Sensor Circuit Range/Performance
1 GMC model · 1 documented issue · 1 critical · $250-$900 repair
P0711 on GMC by model: symptoms, diagnosis and fix
GMT900 and early K2XX Yukon XL models with 6L80/6L90 transmissions commonly develop leaks at the transmission cooler line crimps or quick-connect fittings. Owners report red fluid spots, low transmission fluid, and in severe cases slipping or overheating if fluid loss is significant. This issue is widely documented in owner reports and GM service bulletins addressing cooler line seepage/connection concerns on full-size trucks/SUVs using these transmissions.
Common Symptoms
- Red transmission fluid spots under front of vehicle
- Burnt ATF smell after driving
- Transmission slipping or delayed engagement
- Transmission over-temp message (if severe)
How to Fix
Replace the leaking transmission cooler line(s) or fitting seals; many repairs involve replacing the entire line assembly rather than re-crimping. After repair, verify fluid level with the correct ATF (Dexron VI for 6L80/6L90) and check for overheating-related damage.
Sources for this issue (1)
P0711 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0711 mean on a GMC?
P0711 stands for "Transmission Fluid Temperature Sensor Circuit Range/Performance." P0711 means the transmission fluid temperature (TFT) sensor's signal is outside its expected range or not changing as the computer expects (range/performance). This sensor monitors how hot the transmission fluid is so the computer can adjust shift timing, torque converter lockup, and protect the transmission from overheating. A range/performance fault usually means the sensor is reading an implausible or 'stuck' value rather than being completely open or shorted. It can cause harsh or delayed shifts, no torque converter lockup, or the transmission defaulting to a protective mode. On GMC it is documented across 1 model: Yukon XL.
What are the most common causes of P0711?
The most common causes of P0711 are: Faulty transmission fluid temperature sensor, Low, old, or contaminated transmission fluid, Wiring or connector problems in the sensor circuit, Internal transmission overheating or restriction, Sensor reading stuck or drifting out of range, Poor ground or reference voltage to the sensor, Faulty transmission control module (TCM/PCM). The specific cause varies by vehicle.
How much does it cost to fix P0711 on a GMC?
Published repair estimates on GMC range from $250 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0711 on a different make?
View P0711 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.