1996 Chev Blazer Other - Drive Train & Driveline

Question: my OBII code reader comes up with P1870 What does it mean, and tranny shifts hard into second gear when hot. Check engine light goes out when driving in city. Will not come back on until driven at highway speeds for 5 miles. What can be done, and what could this problem be. When trans is cool, it works normal Thanks for any help

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Technican: Hello, OBDII Code P1870 refers to a transmission component called the torque converter clutch (TCC). Your problem occurs after highway speeds for approx. 5 miles because that is when the TCC is applied/engaged. Most cases around 48mph the TCC gets a signal from a electric solenoid controlled by your computer. Provided the trans. is in 3rd or 4th gear, the solenoid opens a valve to allow hydraulic pressure to engage the clutch thereby minimizing slip in the clutch packs and improving gas mileage. Many Technical Service Bulletins (TSBs) exsist from GM concerning P1870 issues due to the wide variety of engine/trans. options/combination choices offered. You need a good transmission shop that has access to CURRENT service info. They'll help you with a diagnosis and a repair estimate that I expect could run $400-$600 to fix depending on labor rates and parts costs in your area. Your computer is most likely modifying the shift pattern to minimize slip and further wear. You need a professional, here. Find a reputable shop and repair warranty is everything at today's prices.

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