P1860 on 2001-2005 Pontiac Aztek — TCC PWM Solenoid Circuit Electrical
1 vehicles · 1 makes · $800-$4,500 repair
Most Reported On
P1860 is an OBD-II diagnostic trouble code meaning “TCC PWM Solenoid Circuit Electrical.” P1860 is a manufacturer-specific code (most commonly seen on GM vehicles such as Chevrolet, GMC, Buick, and Cadillac) indicating an electrical fault in the Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) solenoid circuit. The PCM/TCM sets this code when it detects a continuous open, short to ground, or short to power in the TCC PWM solenoid valve circuit. This solenoid controls fluid flow that locks up the torque converter, so a fault can affect shift quality, cause stalling at stops, or trigger limp mode. This code is most commonly reported on 2001-2005 Pontiac Aztek, with repair costs ranging from $800 to $4,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P1860, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
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A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
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Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
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A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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FAQ
What does P1860 mean?
P1860 stands for "TCC PWM Solenoid Circuit Electrical." P1860 is a manufacturer-specific code (most commonly seen on GM vehicles such as Chevrolet, GMC, Buick, and Cadillac) indicating an electrical fault in the Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) solenoid circuit. The PCM/TCM sets this code when it detects a continuous open, short to ground, or short to power in the TCC PWM solenoid valve circuit. This solenoid controls fluid flow that locks up the torque converter, so a fault can affect shift quality, cause stalling at stops, or trigger limp mode.
What are the most common causes of P1860?
The most common causes of P1860 are: Failed or shorted TCC PWM solenoid, Open, shorted, or corroded wiring in the solenoid circuit, Damaged or corroded transmission connector / internal wiring harness, Low or contaminated transmission fluid affecting solenoid operation, Faulty PCM/TCM or driver circuit, Internal transmission valve body / fluid passage problem. The specific cause varies by vehicle.
How much does it cost to fix P1860?
Repair costs for P1860 range from $800 to $4,500, depending on the vehicle and root cause.
Which vehicles are affected by P1860?
Au7o has documented P1860 across 1 vehicle models from 1 manufacturers: Pontiac.
Sources (5)
- articlePontiac Aztek Transmission Problems & Cost | 4T65E
- articleTransmission Pressure Control Solenoid Failure May Cause Erratic Shifting: Pontiac Aztek Transmission & Drivetrain (RepairPal)
- NHTSA2003 Pontiac Aztek Automatic Transmission NHTSA Complaints (CarComplaints)
- Forum4T65E pressure control solenoid replacement? | BobIsTheOilGuy
- TSBPontiac TSB 02-07-30-022B — SES Light with Harsh Shifts, Transaxle 20-Way Connector (2001-2004 Aztek)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.