The P1519 code on your 2020 GMC Acadia indicates a high voltage condition in the torque request signal circuit. This GM-specific code affects communication between control modules that manage engine torque output on your Acadia's 2.5L 4-cylinder or 3.6L V6 engine.
Understanding P1519 on Acadia
The torque request signal circuit allows modules like the transmission controller and stability control system to request torque adjustments from the PCM. Code P1519, indicating high voltage, suggests a short to power source or feedback issue in this communication circuit, which is the opposite condition from P1518 (low voltage).
Common Symptoms
- Check engine light illuminated
- Transmission shifting abnormalities
- Stability control light on
- Traction control disabled
- Harsh or unpredictable shifts
- Reduced engine power in some conditions
- Multiple warning lights
Primary Causes
- Short to voltage in torque signal wiring
- Chafed wiring contacting power source
- Internal short in control module
- Connector contamination causing cross-circuit contact
- Wiring harness damage from rodents or installation
- Failed PCM or TCM driver circuit
- Aftermarket remote start or alarm interference
Diagnostic Procedure for 2020 Acadia
Start by scanning all modules for codes and noting which systems show faults. Disconnect the suspected module connectors and measure circuit voltage - high voltage with connectors removed indicates a wiring short. Inspect wiring harness routing for areas where it contacts sharp edges or positive battery cables. Check for rodent damage or aftermarket wiring splices. Test for short to power by checking resistance between the torque signal wire and battery positive.
Repair Solutions
Locate and repair any wiring shorts to power sources. Replace damaged wiring sections with appropriate gauge wire. If a control module has an internal short, replacement is required. Remove or properly integrate aftermarket electronics that may cause interference. Verify all connectors are clean and properly seated. Clear codes from all modules and verify proper operation during test drive.