# P1870 on the 1996 Buick Roadmaster

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P1870

- [10009370](https://open.wenmarpro.com/bulletins/10009370), 2004-09-27: THE ENGINE DOES NOT STALL WHEN PERFORMING A P1870 DIAGNOSTIC TEST WITH THE TECH 2 SCAN TOOL OR WHEN COMMANDING THE TORQUE CONVERTER CLUTCH ENABLE SOLENOID ON APPLICATIONS THAT DO NOT HAVE THE P1870 DIAGNOSTIC TEST LISTED. 4L60E OR 4L65E TRANSMISSIONS. \*TT
- [634815](https://open.wenmarpro.com/bulletins/634815), 2002-10-09: SOME CUSTOMERS MAY COMMENT ON A HARSH 1\-2 UPSHIFT AND THE CHECK ENGINE LIGHT OR SERVICE ENGINE SOON INDICATOR IS ILLUMINATED AND DIAGNOSTIC TROUBLE CODE P1870 SET. \*TT
- [627839](https://open.wenmarpro.com/bulletins/627839), 2002-02-25: INFORMATION REGARDING HARSH 1\-2 UPSHIFT, SERVICE ENGINE SOON, MALFUNCTION INDICATOR LAMP, OR CEL ILLUMINATED, DIAGNOSTIC TROUBLE CODE P1870 SET. \(1996\-2000 CHEVROLET AND GMC LIGHT DUTY TRUCK MODELS\) \*YH