98 Volvo V70 GLT Wagon tranny issues Topic is solved

c98v70 · Post by **c98v70** » 26 Jul 2017, 22:22

Hi! I'm hoping I can get some help with my transmission issue. The 3 buttons S, E and W are blinking like Christmas lights along with the shift arrow. The W button will not engage when pushed down, the S & E buttons will engage when pressed. My V70 will drag in first gear before shifting into 2nd gear. I noticed if I let off the throttle where it should be shifting into 2nd, it will shift ok. I was told it could be the PNP switch. The transmission fluid levels are normal and the color is the translucent red. I went to AutoZone to have the codes read. The codes that displayed are P0120, P0108 and P0123.

I currently live in my V70 wagon as I have just recently got a job after being unemployed after 3 years. Any help with my transmission issue is greatly appreciated. Thank you very much.

-Charles

Post by **erikv11** » 27 Jul 2017, 06:46

For any issue that is potentially due to the PNP, the first thing to check is the contact surfaces inside the PNP switch. You can do this by holding down the button and rowing the shifter back and forth smoothly and quickly through all positions. Like 20-25 times, P all the way down to 1 and back. If the issues get better, the contacts inside are finally too worn away and need to be replaced, or at least cleaned and filed. Sometimes the rowing trick will "fix" things for quite a while, give it a try.

Of course the problem could be more serious than poor contact inside the PNP, this test doesn't rule out a bad PNP, but always worth a try.

Post by **shiloh51933** » 27 Jul 2017, 10:28

c98v70 wrote: ↑26 Jul 2017, 22:22 Hi! I'm hoping I can get some help with my transmission issue. The 3 buttons S, E and W are blinking like Christmas lights along with the shift arrow. The W button will not engage when pushed down, the S & E buttons will engage when pressed. My V70 will drag in first gear before shifting into 2nd gear. I noticed if I let off the throttle where it should be shifting into 2nd, it will shift ok. I was told it could be the PNP switch. The transmission fluid levels are normal and the color is the translucent red. I went to AutoZone to have the codes read. The codes that displayed are P0120, P0108 and P0123.

I currently live in my V70 wagon as I have just recently got a job after being unemployed after 3 years. Any help with my transmission issue is greatly appreciated. Thank you very much.

-Charles

P0120 Throttle Pedal Position Sensor/Switch A circuit malfunction
P0123 " " " " / " " " high input
P0108 Map/BARO pressure circuit high input
You have some electrical issues going on here and I would think the ECM/TCU put you into "limp home mode" so you don't totally blow out your transmission.

jjc1 · Post by **jjc1** » 27 Jul 2017, 13:20

Agree that you may be having an electrical contact and/or grounding issue. Now that you have the codes, I would try a "reset". My '94 850T would have a similar problem once in a while. This may also work on your '98. If you turn the ignition on/off five times (without engine running... just move to "on" not start, turn off, then back to "on") that will stop the blinking lights. Five on/off cycles will basically do the same. Then I'd do the PNP "clean" procedure... without the engine running, slide the shifter up/down about 50 times. This will clear some of the oxidation on the PNP switch contacts. The trans computer should be in a black box on the passenger side of the engine compartment. With ignition off, I'd pull both boards and lift them up, put them back a few times... again to clear any oxidation. Next low-dollar thing I'd try is cleaning both battery terminals and the ground wires... battery to engine, engine to chassis. If your '98 is like my '94, the engine to chassis is on the rear of the engine to the firewall. It's possible it's the s1/s2 relays inside the trans, which you can replace with the trans in the car but are a pain to get to. It's also possible it's the trans computer board and you can find replacements on ebay. If you have a code reader, you should be able to clear the codes to see if they re-appear. Good luck!

c98v70 · Post by **c98v70** » 27 Jul 2017, 19:09

erikv11 wrote: ↑27 Jul 2017, 06:46 For any issue that is potentially due to the PNP, the first thing to check is the contact surfaces inside the PNP switch. You can do this by holding down the button and rowing the shifter back and forth smoothly and quickly through all positions. Like 20-25 times, P all the way down to 1 and back. If the issues get better, the contacts inside are finally too worn away and need to be replaced, or at least cleaned and filed. Sometimes the rowing trick will "fix" things for quite a while, give it a try.

Of course the problem could be more serious than poor contact inside the PNP, this test doesn't rule out a bad PNP, but always worth a try.

I did the "rowing" action. The issue still exists. I'm going to try to clean the PNP switch to see if that helps. I appreciate the advice.

c98v70 · Post by **c98v70** » 27 Jul 2017, 19:13

jjc1 wrote: ↑27 Jul 2017, 13:20 Agree that you may be having an electrical contact and/or grounding issue. Now that you have the codes, I would try a "reset". My '94 850T would have a similar problem once in a while. This may also work on your '98. If you turn the ignition on/off five times (without engine running... just move to "on" not start, turn off, then back to "on") that will stop the blinking lights. Five on/off cycles will basically do the same. Then I'd do the PNP "clean" procedure... without the engine running, slide the shifter up/down about 50 times. This will clear some of the oxidation on the PNP switch contacts. The trans computer should be in a black box on the passenger side of the engine compartment. With ignition off, I'd pull both boards and lift them up, put them back a few times... again to clear any oxidation. Next low-dollar thing I'd try is cleaning both battery terminals and the ground wires... battery to engine, engine to chassis. If your '98 is like my '94, the engine to chassis is on the rear of the engine to the firewall. It's possible it's the s1/s2 relays inside the trans, which you can replace with the trans in the car but are a pain to get to. It's also possible it's the trans computer board and you can find replacements on ebay. If you have a code reader, you should be able to clear the codes to see if they re-appear. Good luck!

I did the ignition 5 times as you suggested and the rowing action and nothing happened. I'm going to look at the ground as you suggested and the boards. I really appreciate the help.