Car Went Limp

Oka · Post by **Oka** » 19 May 2021, 17:00

Went home for lunch, parked in the garage. When done, reversed to the cul-de-sac, put it in drive and step on the gas to go, the car went limp. Pressing the gas pedal did nothing. The car was moving as if it was in gear without stepping on the brake. I stopped, turned around and parked; and I took the other XC. When I parked and stopped, I started the car and it started. I forgot to step on the gas so see what would happen. Will do that when I get back home.

What would be the issue?
Thanks.

Post by **abscate** » 19 May 2021, 19:13

You’ve got the last year of the Italian throttle body that last about 150,000 miles , then limp you home, I think.

Oka · Post by **Oka** » 19 May 2021, 22:08

abscate wrote: ↑19 May 2021, 19:13 You’ve got the last year of the Italian throttle body that last about 150,000 miles , then limp you home, I think.

Sorry, I do not understand your reply, could you please be more explicit?
Thank you.

Post by **jonesg** » 19 May 2021, 22:14

read the codes, could very well be the italian made throttle body.

The volvo system is digital and analog for safety, the computer reads and compares the 2 signals, if they vary it triggers limp for safety. Restarting often resets the mode and all seems normal til it occurs again.
But read the codes to make sure.

Oka · Post by **Oka** » 19 May 2021, 23:00

jonesg wrote: ↑19 May 2021, 22:14 read the codes, could very well be the italian made throttle body.

The volvo system is digital and analog for safety, the computer reads and compares the 2 signals, if they vary it triggers limp for safety. Restarting often resets the mode and all seems normal til it occurs again.
But read the codes to make sure.

The throttle body was from https://xemodex.com/

Post by **jonesg** » 20 May 2021, 10:06

then ... read the codes.
Too many issues can trip limp mode.
On mine the turbo blew up.

Post by **volvolugnut** » 20 May 2021, 10:18

Could also be electronic pedal position sensor.
volvolugnut

Oka · Post by **Oka** » 25 May 2021, 14:36

Hello, could this be it, or something else?

Post by **kcodyjr** » 25 May 2021, 22:50

Driver's door module? Seems unlikely... the only one that's even close to suspicious is CEM-1C01

EngineeringBloke · Post by **EngineeringBloke** » 01 Jun 2021, 10:25

I'm not familiar with these screens but in the middle there is a line:

The control module "Limp Home" program has been initiated.

This is under the heading "Substitute Value" for the DDM door control module error DDM-0049.

This suggests that when an error with the door module occurs, the car will be set to limp mode by design. Given this is door mirror, window and perhaps lock control, I do not see why the car should be set to limp mode.

I note that part of the display shows Previous operation cycle which has an error, but Current operation cycle appears ok. Is the issue now resolved?

This might not happen again or could be the first sign of a failure in the door wiring, or the door module.