P1870Transmission

Transmission Component Slipping (GM)

P1870 is a GM transmission code meaning a transmission component (often the torque converter clutch) is slipping. The PCM detected excessive slip that exceeds allowable limits.

🚗 Use caution. Slippage can worsen quickly; diagnose promptly.
HIGH
severity
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🎯 Top Causes, Ranked by Likelihood

#1Worn torque converter clutch$300-$1500
45%
A worn TCC slips and sets the code.
#2Low or degraded transmission fluid$50-$250
30%
Low or burnt fluid reduces clutch apply pressure.
#3TCC solenoid or valve body wear$100-$800
25%
A failing solenoid or worn valve body causes slip.

🩺 Common Symptoms

💰 Repair Cost: DIY vs Shop

DIY Cost
$50-$300
Shop Cost
$200-$1800

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P1870

1Check transmission fluid level and condition
2Inspect the TCC solenoid operation
3Test valve body pressure
4Rebuild or replace the torque converter if slipping persists

❓ Frequently Asked Questions

Can I drive with P1870?
With caution. Continued slipping generates heat and can destroy the transmission.
Is P1870 a GM code?
Yes, P1870 is a GM transmission component slipping code, often torque converter related.
What causes P1870?
A worn torque converter clutch, low or burnt fluid, or a failing TCC solenoid/valve body are common causes.

🔗 Related Codes

P1811P0741P0742
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