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

Question type: Maintenance & Repair

1 Answer

97,205

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

Add photo

Related Questions

Search Buick Century Questions

Buick Century Experts

#1 John Saffrahn
John Saffrahn
Reputation 940
#2 Tom Demyan
Tom Demyan
Reputation 780
#3 John Pate
John Pate
Reputation 520
View All

Related Models For Sale

Used Buick LeSabre
21 Great Deals out of 1,937 listings starting at $1,588
Used Buick Regal
191 Great Deals out of 10,535 listings starting at $4,000
Used Buick Park Avenue
422 listings starting at $2,695
Used Ford Taurus
280 Great Deals out of 18,678 listings starting at $1,499
Used Honda Accord
1,079 Great Deals out of 66,787 listings starting at $1,000
Used Chevrolet Malibu
1,147 Great Deals out of 80,895 listings starting at $2,500
Used Toyota Camry
1,245 Great Deals out of 82,706 listings starting at $750
Used Toyota Corolla
970 Great Deals out of 69,188 listings starting at $1,800
Used Nissan Altima
1,271 Great Deals out of 74,941 listings starting at $1,800
Used Honda Civic
859 Great Deals out of 84,016 listings starting at $750

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.