P1860 Chevrolet Code - TCC PWM Solenoid Circuit Electrical
Quick Answer
The P1860 Chevrolet code indicates a problem with the TCC (Torque Converter Clutch) PWM (Pulse Width Modulation) solenoid circuit's electrical components. Common causes include Faulty TCC PWM solenoid, Wiring or connection issues in the solenoid circuit, Corrosion or damage to electrical components. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1860 Chevrolet indicates TCC PWM Solenoid Circuit Electrical.
- Common causes
- Common causes include Faulty TCC PWM solenoid, Wiring or connection issues in the solenoid circuit, Corrosion or damage to electrical components.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1860 Chevrolet Description
The P1860 Chevrolet code indicates a problem with the TCC (Torque Converter Clutch) PWM (Pulse Width Modulation) solenoid circuit's electrical components. This solenoid is responsible for controlling the engagement and disengagement of the torque converter clutch, which helps improve fuel efficiency and reduce heat build-up in the transmission. When this circuit malfunctions, it can lead to issues with the transmission's operation, affecting the vehicle's performance and potentially causing long-term damage if not addressed promptly.
Common Causes of P1860 Chevrolet
- Faulty TCC PWM solenoid.
- Wiring or connection issues in the solenoid circuit.
- Corrosion or damage to electrical components.
- Low transmission fluid levels.
- Internal transmission problems affecting the solenoid's operation.
Symptoms of P1860 Chevrolet
- Check Engine Light illuminated on the dashboard.
- Harsh shifting or slipping transmission.
- Decreased fuel efficiency.
- Transmission overheating.
- Inability to engage or disengage the torque converter clutch.
How to Fix P1860 Chevrolet
- Diagnose the issue using a scan tool to confirm the P1860 code and pinpoint the exact cause.
- Inspect the TCC PWM solenoid, wiring, and connections for any signs of damage or corrosion.
- Replace the faulty solenoid or repair any damaged wiring or connections.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
- Perform a transmission fluid flush and refill if necessary to ensure proper operation of the torque converter clutch.
Cost to Fix P1860 Chevrolet
The cost of repairing a P1860 Chevrolet code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts for a TCC PWM solenoid replacement can range from $100 to $300, while the labor costs may be between $150 and $300. Therefore, the total repair cost could be anywhere from $250 to $600, but it's recommended to obtain quotes from local auto repair shops for a more accurate estimate.
Tech Notes for P1860 Chevrolet
2004 Chevrolet Classic
2000-2001 Chevrolet Lumina
2000-2004 Chevrolet Cavalier
2000-2004 Chevrolet Impala
2000-2004 Chevrolet Malibu
2000-2004 Chevrolet Monte Carlo
2000-2004 Chevrolet Venture
Chevrolet Factory Service Bulletin OBDII Code P1860
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Frequently Asked Questions about P1860 Chevrolet Code
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Discuss the causes and fixes for P1860 Chevrolet OBDII Code
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I had the p1860 code only on my 1999 gmc yukon .... Was looking on the web and was very mis leading and poeple telling you it's the ignition switch ,pcm , bad wire ! We'll this what I did the when I got the p1860 code ! It is tcc pwm solenoid ... I dropped the transmission pan located the tcc pwm solenoid ... It's towards the back of the pan left side . I removed it ... Don't forget to remove the clip that keeps the solenoid in place and after it was removed I tested it and it should read 10 to 15 ohms... And mine only read 3 ohms so it was bad and don't forget to test leads that plug into the solenoid should read 10 to 12 volts ! So I replaced the solenoid with a new one and yes that fixed it ! No more error code..got the part from napa auto parts and don't forget the transmission filter , gasket and fluid and it all cost less than $100 dollars
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hi there I have a code P1860 code on my 1997 Chevrolet Express 1500 and took it to a body shop they said it might be the starter so I replaced the starter and then I changed the battery but the problem is there still and now they say it may be the ignition switch but not 100% sure ! then I read what P1860 code means and it says its the TCC PWM Solenoid what part did u buy to fix it?
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I found it that I need a neutral safety switch! hopefully everything gets fixed!
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P0300 - Cylinder Misfire Detected Random Cylinders
Read more: http://www.autocodes.com/p0...
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I have a 1998 chey blazer and i had the pan dropped i had changed the filter. And the fluid also the tcc pwm solenoid and it still throws p1860
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I have a 2001 s10 pickup and did the same thing changed fluid filter and solenoid and came right back on
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Do you have any other codes besides the P1860? what is the engine size of your S10?
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The solenoid and filter are the most common cause of the problem, but you already replaced that. According to a national database of repairs for your model year the most likely cause of the P1860 code, after the solenoid and transmission filter, is the "Ignition Switch". If the problem continues, then items on the list are the PCM and transmission assembly.
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I have that p1860 code on a 2004 Silverado. first it didn't carry current to the solenoids and now it only reaches it for 30 seconds then it cuts off and doesn't change. I delete the codes and it works once then it doesn't change again. and I put the scanner on it and it tells me that solenoid 2-3 is not working or is open, I delete the code and again it changes once and so every time I put the scanner on it gives me a code Different from solenoid failure until it marks the p1860 that can be if someone has a solution or has the same problem.
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On your vehicle, the ignition switch is by far the most common problem that will set the P1860.
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On 4L80 & 60 transmissions the internal wiring harness can seep fluid through to the external connector on the side of the transmission. Causing shorts and open connections. Simple check - disconnect the plug and if there is fluid - you need to replace the harness. Which in 2025 dollars is about $50.
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