P2138 on Gmc Yukon
Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Gmc Yukon context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P2138.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P2138 Means on Your Gmc Yukon
P2138 is a diagnostic trouble code indicating: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Gmc Yukon Owner Reports
Source: NHTSA Complaints Database
"Without warning, check engine light, reduced power and stability system shut down dash board engine light came on and stayed on. had engine code scanned (p2138, p0102) still problem is not resolved. dealer was no help just wanted to sell parts that may fix it."
"Tl* the contact owns a 2008 gmc yukon xl. the contact stated that the vehicle would only accelerate to 10 t0 15 mph. in addition, the stabilitrac, engine control module, and engine power reduced indicators illuminated. the contact was able to drive the vehicle onto the road shoulder."
"This is twice that i've received the p2138 throttle body sensor code, which causes reduced engine power and has subsequent issues around stabilitrack/awd. the first time was in the middle of an intersection, we limped out of the intersection at 3 mph. today, my wife limped home from the store."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Gmc Yukon
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.