I have a 1998 Buick Century Custom and I failed inspection for a P1870 code. What is this and how do I fix it? I was told to disconnect the battery for a few hours and this may reset it.

Asked by Sep 12, 2013 at 01:02 PM about the 1998 Buick Century Custom Sedan FWD

Question type: Maintenance & Repair

1 Answer

118,165

DTC P1870 is a type B code. The conditions for setting the P1870 DTC must occur on TWO CONSECUTIVE TRIPS (ignition cycles, with a drive cycle) before setting a P1870 history code. When the conditions for setting DTC P1870 are met (first trip), the PCM commands maximum line pressure and harsh 1-2 shifts are the result. This may result in a harsh 1-2 shift with no history code if the conditions for setting the DTC required for the second trip are not met, on two consecutive trips (Ignition cycles, with a drive cycle). When the conditions for setting the DTC are met, on the second consecutive trip, a DTC P1870 is stored as a history code. When the P1870 code is stored, the PCM will turn on the Service Engine Soon (SES), Check Engine Light (CEL), or Malfunction Indicator Lamp (MIL). Correction Install a control valve body with the revised TCC regulator and isolator valves. You can try the battery disconnect idea but if it does work it will be temporary.

Your Answer:

Buick Century Experts

  • #1
    John Saffrahn
    Reputation
    1,050
  • #2
    Tom Demyan
    Reputation
    940
  • #3
    John Pate
    Reputation
    680
View All

Related Models For Sale

Used Buick LeSabre
3 Great Deals out of 1,352 listings starting at $1,500
Used Buick Regal
83 Great Deals out of 3,698 listings starting at $1,995
Used Buick Park Avenue
282 listings starting at $2,000
Used Honda Accord
665 Great Deals out of 102,710 listings starting at $999
Used Chevrolet Malibu
627 Great Deals out of 51,292 listings starting at $1,550
Used Toyota Camry
870 Great Deals out of 71,649 listings starting at $1,300
Used Ford Taurus
200 Great Deals out of 15,520 listings starting at $915
Used Honda Civic
468 Great Deals out of 45,629 listings starting at $1,150
Used Toyota Corolla
655 Great Deals out of 64,736 listings starting at $1,499
Used Pontiac Grand Prix
15 Great Deals out of 1,703 listings starting at $1,500
Used Chevrolet Silverado 1500
1,765 Great Deals out of 155,976 listings starting at $1,700

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.