Code info please
Thread Starter
Racer
Joined: Nov 2003
Posts: 397
Likes: 1
From: Bedford TX
Code info please
Long story short, just had my a4 rebuilt at the dealer under the extended warranty. A week later started having problems with the shifting. When the tranny fluid gets to about 189 in slow traffic it slams into each gear while leaving it in D and letting it do its thing. Acts like the shifting pressures is at max. After it cools down overnight it acts fine. Today the check engine light came on while cruising and then in slow traffic it starts slamming into gears. Pulled up some codes, most history, but one says on the PCM module P1870 H C. Can't find that one on my sheet of codes. Any idea what that one is?
Race Director
Joined: Apr 1999
Posts: 15,157
Likes: 478
From: NM
I did a google search for P1870 and came up with this:
Diagnostic trouble code P1870 (Transmission Component Slippage) is a General Motors-specific code whose set parameters are determined by transmission type and engine size. The PCM monitors and compares engine speed to vehicle speed after the converter clutch has been commanded ON in either high gear or Overdrive. Should the expected rpm ratio exceed predetermined parameters, DTC 1870 sets. And upon doing so, the PCM elevates the transmission main line pressure and stops converter clutch apply.
http://findarticles.com/p/articles/m...6/ai_n17177306
Generic but gives an idea.
tom...
Diagnostic trouble code P1870 (Transmission Component Slippage) is a General Motors-specific code whose set parameters are determined by transmission type and engine size. The PCM monitors and compares engine speed to vehicle speed after the converter clutch has been commanded ON in either high gear or Overdrive. Should the expected rpm ratio exceed predetermined parameters, DTC 1870 sets. And upon doing so, the PCM elevates the transmission main line pressure and stops converter clutch apply.
http://findarticles.com/p/articles/m...6/ai_n17177306
Generic but gives an idea.
tom...
Thread Starter
Racer
Joined: Nov 2003
Posts: 397
Likes: 1
From: Bedford TX
I did a google search for P1870 and came up with this:
Diagnostic trouble code P1870 (Transmission Component Slippage) is a General Motors-specific code whose set parameters are determined by transmission type and engine size. The PCM monitors and compares engine speed to vehicle speed after the converter clutch has been commanded ON in either high gear or Overdrive. Should the expected rpm ratio exceed predetermined parameters, DTC 1870 sets. And upon doing so, the PCM elevates the transmission main line pressure and stops converter clutch apply.
http://findarticles.com/p/articles/m...6/ai_n17177306
Generic but gives an idea.
tom...
Diagnostic trouble code P1870 (Transmission Component Slippage) is a General Motors-specific code whose set parameters are determined by transmission type and engine size. The PCM monitors and compares engine speed to vehicle speed after the converter clutch has been commanded ON in either high gear or Overdrive. Should the expected rpm ratio exceed predetermined parameters, DTC 1870 sets. And upon doing so, the PCM elevates the transmission main line pressure and stops converter clutch apply.
http://findarticles.com/p/articles/m...6/ai_n17177306
Generic but gives an idea.
tom...
Thread Starter
Racer
Joined: Nov 2003
Posts: 397
Likes: 1
From: Bedford TX
